Late Positive Potential Amplitudes Research Articles

Understanding Relations Between Product Icon Type, Feature Type, and Abstraction: Evidence From ERPs and Eye-Tracking Studys

The representation and recognition of icons play a crucial role in interface interaction efficiency and user experience within human–computer interaction. However, the intricate relationship between product icon types, feature types, and abstraction in cognitive contexts has yet to be clarified. This study aimed to delve into the cognitive mechanisms concerning practical and hedonic product icons across varying abstraction levels using EEG analysis. Moreover, it investigated how the explicitness and implicitness of these icons and their abstraction levels influence recognition efficiency via eye-tracking studies. In Experiment A, a high abstraction level led to prolonged reaction times (RTs), reduced accuracy rate (ACC), more negative N400, and decreased late positive potential (LPP) amplitudes. These outcomes suggested increased effort, heightened semantic conflict, and negative emotional engagement. Moreover, at middle abstraction levels, RTs were consistently longer for hedonic product icons compared to practical ones. Additionally, both N400 and LPP amplitudes were notably larger for hedonic product icons. In Experiment B, eye-tracking results revealed that compared with implicit features, the change of abstraction degree of explicit features is more likely to increase the number of fixation points and RTs of users. Specifically, functional explicit features wielded the greatest impact on overall icon cognitive efficiency. Synthesizing both experiments revealed significant differences in abstraction requirements for practical vs. hedonic product icons. A practical implication arises: moderate overall abstraction suits practical product icons, while higher abstraction suits hedonic ones. Among features, it’s essential to avoid excessive abstraction in functional and symbolic aspects, while simplifying or removing area line features and chamfered elements can be beneficial. This study contributes to Internet of Things (IoT) icon research, offering potential guidance for graphic designers in crafting user-friendly icons.

Biological sex and hormonal contraceptive associations with drug cue reactivity in cannabis use disorder

Biological sex differences in Cannabis Use Disorder (CUD) progression, cannabis withdrawal severity, and pharmacotherapy response have been reported, suggesting that CUD mechanisms may differ by sex. Drug cue reactivity is an established predictor of drug use behavior, but the literature on sex differences in drug cue reactivity is mixed, including in CUD. One possible moderator of sex differences in drug cue reactivity is hormonal contraceptive (HC) use. The aim of the present study was to test whether sex differences in neural cannabis cue reactivity and craving varied by female HC use in a CUD sample. As part of a larger study, 152 adults reporting frequent cannabis use completed a drug cue reactivity task during electrocenphalogram recording. Late positive potential (LPP) amplitude modulation by cannabis cues was used to measure neural cue reactivity. Craving after the cue reactivity task was also assessed. Males (n = 74) and naturally-cycling females (n = 26), who did not differ from each other, showed significantly greater LPP enhancement to cannabis vs. neutral cues compared to HC-using females (n = 52), an effect mostly driven by neutral cues. Craving was significantly higher in naturally-cycling but not HC-using females compared to males, but only in covariate-unadjusted analyses. Exploratory analyses of HC and menstrual phase characteristics indicate a progesterone-related mechanism may underlie HC effects on cannabis cue reactivity. The present study's results suggest that mixed findings on drug cue reactivity sex differences may be due to variability in HC use, which has implications for sex-specific models of CUD progression and treatment.

Implicit induction of expressive suppression in regulation of happy crowd emotions

ABSTRACT Implicit emotion regulation provides an effective means of controlling emotions triggered by a single face without conscious awareness and effort. Crowd emotion has been proposed to be perceived as more intense than it actually is, but it is still unclear how to regulate it implicitly. In this study, participants viewed sets of faces of varying emotionality (e.g. happy to angry) and estimated the mean emotion of each set after being primed with an expressive suppression goal, a cognitive reappraisal goal, or a neutral goal. Faster discrimination for happy than angry crowds was observed. After induction of the expressive suppression goal instead of the cognitive reappraisal goal, augmented N170 and early posterior negativity (EPN) amplitudes, as well as attenuated late positive potential (LPP) amplitudes, were observed in response to happy crowds compared to the neutral goal. Differential processing of angry crowds was not observed after the induction of both regulatory goals compared to the neutral goal. Our findings thus reveal the happy-superiority effect and that implicit induction of expressive suppression improves happy crowd emotion recognition, promotes selective coding, and successfully downregulates the neural response to happy crowds.

Mothers' and fathers' neural responses toward gender-stereotype violations by their own children.

Gender stereotypes facilitate people's processing of social information by providing assumptions about expected behaviors and preferences. When gendered expectations are violated, people often respond negatively, both on a behavioral and neural level. Little is known about the impact of family kinship on the behavioral and neural reactions to gender-stereotype violations. Therefore, we examined whether parents show different responses when gender stereotypes are violated by their own children vs unknown children. The sample comprised 74 Dutch families with a father (Mage = 37.54), mother (Mage = 35.83), son, and daughter aged 3-6 years. Electroencephalography measurements were obtained while parents viewed pictures of their own and unknown children paired with toy or problem behavior words that violated or confirmed gender stereotypes. In half of the trials, parents evaluated the appropriateness of toy-gender and behavior-gender combinations. Parents showed stronger late positive potential amplitudes toward gender stereotype-violating behaviors by own children compared to unknown children. Moreover, parents' P1 responses toward gender stereotype-violating child behaviors were stronger for boys than for girls and for parents who evaluated gender-stereotype violations as less appropriate than gender-stereotype confirmations. These findings indicated that gender-stereotype violations by parents' own children are particularly salient and viewed as less appropriate than gender-stereotype confirmations.

Electrocortical Correlates of Emotion Processing and Resilience in Individuals with Adverse Childhood Experiences

AbstractChildhood trauma is associated with poor health outcomes in adulthood, largely due to the impact of chronic stress on the body. Fortunately, there are certain protective characteristics, such as constraint (i.e., impulse control, inhibition, and avoidance of unconventional behavior and risk) and cognitive reappraisal (i.e., reframing circumstances in a more positive light). In the present study, we investigated the interaction between childhood trauma, resilience, and neural correlates of emotion processing. Participants responded to survey questions regarding childhood trauma and resilient characteristics. They were later invited to passively view neutral, unpleasant, and pleasant images while their brain activity was recorded via electroencephalography (EEG). We analyzed two event-related potential (ERP) components of interest: the Early Posterior Negativity (EPN) and Late Positive Potential (LPP). We found that childhood trauma was associated with decreased constraint and reduced sensitivity to unpleasant images (i.e., decreased LPP amplitude differences between neutral and unpleasant images as compared to controls). Further, constraint predicted increased sensitivity to pleasant images. In a hierarchical linear regression analysis, we found that constraint moderated the relation between childhood trauma and emotion processing, such that it predicted increased sensitivity to unpleasant images for adults with childhood trauma in particular. Childhood trauma and cognitive reappraisal independently predicted decreased sensitivity to unpleasant images, (i.e., decreased LPP amplitude differences between neutral and unpleasant images). Our findings suggest that childhood trauma and resilient characteristics independently and interactively influence emotion processing.

Psychopathic callousness and perspective taking in pain processing: an ERP study.

Psychopathy is a multifaceted personality disorder characterized by distinct affective/interpersonal traits, including callousness-unemotionality/meanness, which are often considered the hallmarks of empathic deficits. It has been posited that the processing of others' pain could play an important role in empathy capabilities. This study aimed to investigate the influence of perspective taking on electrocortical responses during pain processing in relation to psychopathic callousness. The late positive potential (LPP) -a well-established electrophysiological indicator of sustained attention to motivationally significant stimuli- was measured while 100 female undergraduates viewed images depicting bodily injuries while adopting an imagine-self or an imagine-other perspective. Callousness factor scores -computed as regression-based component scores from EFA on three relevant self-report measures of this dimension- predicted reduced LPP amplitudes to pain pictures under the imagine-other (but not imagine-self) perspective, even after controlling for other LPP conditions. This result suggests that high-callous individuals exhibit diminished brain responsiveness to others' distress, potentially contributing to the empathic deficits observed in psychopathy. This finding highlights the usefulness of the LPP and perspective taking in studies on pain processing to refine our understanding of the low empathy characteristics of psychopathy in biobehavioral terms.

Brain potentials reveal reduced sensitivity to negative content during second language production

Abstract Prior research suggests that bilinguals show reduced sensitivity to negative content when operating in the second language (L2). The available evidence, however, is limited to language comprehension. We tested the production of emotional words in Polish (L1)–English (L2) bilinguals in two EEG studies that manipulated emotional cueing. In Experiment 1 (neutral context), white or black circles indicated whether participants should read aloud (shadow) or translate a subsequently presented word. N400 amplitudes were selectively reduced for negative L2 words regardless of the task. In Experiment 2 (emotional context), we used black or white emojis, either sad or neutral, as cues. The previous interaction between word valence and language of operation vanished, but late positive potential amplitudes elicited by negative words were larger for translation from L2 to L1 (i.e., production in Polish) than L1 to L2. These results validate and extend to production previous findings of attenuated emotional response in L2 comprehension.

Expectancy and attention bias to spiders: Dissecting anticipation and allocation processes using ERPs.

The current registered report focused on the temporal dynamics of the relationship between expectancy and attention toward threat, to better understand the mechanisms underlying the prioritization of threat detection over expectancy. In the current event-related potentials experiment, a-priori expectancy was manipulated, and attention bias was measured, using a well-validated paradigm. A visual search array was presented, with one of two targets: spiders (threatening) or birds (neutral). A verbal cue stating the likelihood of encountering a target preceded the array, creating congruent and incongruent trials. Following cue presentation, preparatory processes were examined using the contingent negative variation (CNV) component. Following target presentation, two components were measured: early posterior negativity (EPN) and late positive potential (LPP), reflecting early and late stages of natural selective attention toward emotional stimuli, respectively. Behaviorally, spiders were found faster than birds, and congruency effects emerged for both targets. For the CNV, a non-significant trend of more negative amplitudes following spider cues emerged. As expected, EPN and LPP amplitudes were larger for spider targets compared to bird targets. Data-driven, exploratory, topographical analyses revealed different patterns of activation for bird cues compared to spider cues. Furthermore, 400-500 ms post-target, a congruency effect was revealed only for bird targets. Together, these results demonstrate that while expectancy for spider appearance is evident in differential neural preparation, the actual appearance of spider target overrides this expectancy effect and only in later stages of processing does the cueing effect come again into play.

Neurocognitive mechanisms of mental imagery-based disgust learning

Disgust imagery represents a potential pathological mechanism for disgust-related disorders. However, it remains controversial as to whether disgust can be conditioned with disgust-evoking mental imagery serving as the unconditioned stimulus (US). Therefore, we examined this using a conditioned learning paradigm in combination with event-related potential (ERP) analysis in 35 healthy college students. The results indicated that the initial neutral face (conditioned stimulus, CS+) became more disgust-evoking, unpleasant, and arousing after pairing with disgust-evoking imagery (disgust CS+), compared to pairing with neutral (neutral CS+) and no (CS−) imagery. Moreover, we observed that mental imagery-based disgust conditioning was resistant to extinction. While the disgust CS + evoked larger P3 and late positive potential amplitudes than CS− during acquisition, no significant differences were found between disgust CS+ and neutral CS+, indicating a dissociation between self-reported and neurophysiological responses. Future studies may additionally acquire facial EMG as an implicit index of conditioned disgust. This study provides the first neurobiological evidence that associative disgust learning can occur without aversive physical stimuli, with implications for understanding how disgust-related disorders may manifest or deteriorate without external perceptual aversive experiences, such as in obsessive-compulsive disorder (OCD).

Impaired implicit emotion regulation in patients with panic disorder: An event-related potential study on affect labeling.

Panic disorder (PD) involves emotion dysregulation, but its underlying mechanisms remain poorly understood. Previous research suggests that implicit emotion regulation may play a central role in PD-related emotion dysregulation and symptom maintenance. However, there is a lack of studies exploring the neural mechanisms of implicit emotion regulation in PD using neurophysiological indicators. To study the neural mechanisms of implicit emotion regulation in PD with event-related potentials (ERP). A total of 25 PD patients and 20 healthy controls (HC) underwent clinical eva-luations. The study utilized a case-control design with random sampling, selecting participants for the case group from March to December 2018. Participants performed an affect labeling task, using affect labeling as the experimental condition and gender labeling as the control condition. ERP and behavioral data were recorded to compare the late positive potential (LPP) within and between the groups. Both PD and HC groups showed longer reaction times and decreased accuracy under the affect labeling. In the HC group, late LPP amplitudes exhibited a dynamic pattern of initial increase followed by decrease. Importantly, a significant group × condition interaction effect was observed. Simple effect analysis revealed a reduction in the differences of late LPP amplitudes between the affect labeling and gender labeling conditions in the PD group compared to the HC group. Furthermore, among PD patients under the affect labeling, the late LPP was negatively correlated with disease severity, symptom frequency, and intensity. PD patients demonstrate abnormalities in implicit emotion regulation, hampering their ability to mobilize cognitive resources for downregulating negative emotions. The late LPP amplitude in response to affect labeling may serve as a potentially valuable clinical indicator of PD severity.

Late positive potential component and cognitive functioning in occipital area of Mild Cognitive Impairment

AbstractBackgroundMild Cognitive Impairment (MCI) is a prodromal stage of Alzheimer’s disease and other dementias (Langa & Levine, 2014). It has been suggested that a late event‐related potential (ERP) called the late positive potential (LPP) is related to cognitive functioning including sustained attention and reaction time in people with MCI (Waninger et al., 2018). The LPP in the occipital area was also suggested to be a biomarker of MCI (Liu et al., 2022). However, it remains unclear whether LPP in the occipital area is related to cognitive functioning.MethodWe collected EEG of 50 people with MCI (mean age 72.44±7.96; education: 5.52±1.07) by using a 20‐channel EEG recording system while participants performed the simple vigilance task (SVT). Their reaction time (ms) was taken as a measure of sustained attention. Vienna Reaction Time Task (VRTT) (Schuhfried GmbH, Moedling, Austria) was used to measure processing speed and inhibition while separating motor action (measured as a motor time) and cognitive processing (measured as a reaction time). Mini‐Mental State Examination (MMSE) was used to measure the severity of cognitive impairment (mean score: 26.20±2.44). Correlation analysis was used to analyze the liner relationship between the average LPP amplitude in the occipital areas (Oz, O1, and O2; time window: 400 to 800 ms after stimulus presentation), reaction time on the three versions of the VRTT, and reaction time on the SVT.ResultWe found significant correlations between reaction time on the SVT and motor time on VRTT (S1: p = 0.015; S2: p = 0.075; S3: p = 0.021;), but we found no significant correlations between reaction time on the SVT and VRTT (ps > 0.193), no significant correlations between LPP amplitude in the occipital areas and reaction time on any of the tasks (SVT: p > 0.056, VRTT: ps > 0.288) or between LPP amplitude and motor time on any version of the VRTT (ps > 0.500).ConclusionOur preliminary results indicate that LPP amplitude measured over the occipital area was not significantly associated with sustained attention or inhibition.

Adiposity and Insulin Resistance Moderate Brain Electrophysiology and Affect Regulation in Young Adults

AbstractBackgroundObesity and insulin resistance (IR) may negatively influence affect regulation in young adulthood. The paucity of studies that have investigated such associations have predominantly used functional magnetic resonance imaging. However, electroencephalography (EEG) can evaluate neural signatures in real‐time that may be complementary. Thus, this study investigated how adiposity and IR moderated brain activity and underlying affect regulation using EEG.MethodReal‐time EEG was recorded in 28 lean and obese young adults with and without IR (18‐39 years, 46.4% female). Two event‐related potential (ERP) components of affect regulation, early posterior negativity (EPN) and late positive potential (LPP), were quantified from EEG data. Participants completed the Interactional Picture Affective System task to measure affect regulation, from which mean valence ratings and stimulus‐to‐response‐onset reaction times were calculated. ERP components and affect regulation parameters were then contrasted in three conditions, as follows: 1) Negative – Neutral; 2) Positive – Neutral; and 3) Negative – Positive. Height, weight, body fat percentage (%BF), and serum proteomics were collected. Fasting glucose and insulin readings were obtained to quantify Homeostatic Model Assessment for Insulin Resistance (HOMA‐IR). Hierarchical moderated regression analysis was utilized to test the interrelationships between adiposity, IR, neural activity, and affect regulation.ResultAcross all contrasted conditions, HOMA‐IR and %BF were found to moderate the relationships between frontal and parietal LPP amplitudes during the late latency window and affect regulation. Specifically, higher late frontal LPP amplitudes were associated with less negative and more positive valence ratings to unpleasant and pleasant stimuli, respectively, among participants with low, but not high, IR and %BF levels. In the Negative – Neutral and Negative – Positive conditions, lower late parietal LPP amplitudes were also associated with less negative overall valence ratings in response to unpleasant stimuli, but only in lean, insulin sensitive participants. These results overall suggest that modulation of negative and positive affectivity only occurs in lean young adults without IR.ConclusionYoung adults with greater adiposity and IR showed worse affect regulation than those without obesity and IR. Furthermore, AD‐associated characteristics may start early in life, and EEG signatures may be a useful neuroimaging approach for tracking such events.

Evaluating the impact of water reuse educational videos on water reuse perceptions using EEG/event related potential

As climate change and population growth increasingly stress freshwater resources, government agencies and scientists have recognized the importance of water reuse (the beneficial use of reclaimed or recycled water). While end users (municipalities and farmers) are largely open to exploring water reuse, a barrier to using this water source is the public's negative perception, or the ‘yuck factor’. Recognizing that water reuse is becoming a necessity, there is an urgent need to determine how to improve public acceptance of this water source. Increasing knowledge has been identified as a critical method for improving the adoption of sustainable practices, but to date, there has been a lack of outcome studies on the ability of water reuse education materials to change perceptions. Previous studies have relied heavily on self-reported concerns and perceptions which are limited by bias and social expectations, and their results have failed to substantially change water reuse education efforts, and by extension failed to substantially improve water reuse perceptions. We propose the integration of psychology for evaluating the effectiveness of water reuse education and outreach efforts. The purpose of this study was to determine if water reuse educational videos modulate perceptions of water reuse terms. Participants were recruited from a university campus and completed pre-intervention surveys on water reuse knowledge, willingness to use recycled water, and preferred water reuse information sources. We then measured changes in neural activity in response to multiple categories of water reuse terms pre- and post-exposure to water reuse education videos using electroencephalogram (EEG). Through EEG we measured event related potential (ERP), which assesses sustained engagement with the cues (late positive potential (LPP) amplitude), and alpha power. Participants also completed a pre/post exposure battery involving five tasks, in randomized order, presented before and after viewing videos. Sixty-eight percent of survey participants had previously heard of water reuse and 91% reported willingness to use recycled water for at least one activity. Participants reported obtaining water reuse information mostly from the internet (77%) and preferred to receive additional information mainly by watching online videos (73%). We observed significant increases in alpha power, corresponding to feelings of relaxation, in response to seven of eight water reuse term categories post-video exposure. These findings show that water reuse educational videos can change perceptions of water reuse. Our results point to the possibility of validating and increasing the effectiveness of water reuse education materials using sophisticated neurocognitive measures.

The Influence of Green Product Type, Message Framing, and Anticipated Pride on Green Consumption Behavior: An Event-Related Potential (ERP) Study.

Different types of green products require different marketing approaches to promote individual green purchasing behaviors. Previous studies have focused only on the effects of message framing on the promotion of different types of green products; however, little is known about the role of underlying emotions. Using event-related potentials (ERPs), this study investigated the neural responses to message framings and anticipated pride in green product types to assess their level of influence on green consumption. Participants in this study were randomly assigned to the anticipated pride versus control groups, and asked to make green consumption decisions involving different types (self- vs. other-interested) of green products, utilizing both gain and loss framing. The behavioral results demonstrated that participants in the anticipated pride group made more green product purchase choices than those in the control group. The ERP results showed that within the loss framing of the control group, other-interested green products induced larger N400 and smaller late positive potential (LPP) amplitudes than self-interested green products, whereas the results showed the opposite trend for the anticipated pride group. These results indicate that although individuals might have biases in their motivation that lead them to focus on self-interested green products, anticipating pride reduces cognitive conflicts and increases their motivation to focus on other-interested green products in the context of loss.

Emotion regulation in adolescents with major depression – Evidence from a combined EEG and eye-tracking study

BackgroundAdolescent major depression (MD) is characterized by deficits in emotion regulation (ER). Little is known about the neurophysiological correlates that are associated with these deficits. Moreover, the additional examination of visual attention during ER would allow a more in-depth understanding of ER deficits but has not yet been applied simultaneously. MethodsN = 33 adolescents with MD and n = 35 healthy controls (HCs) aged 12–18 years performed an ER task during which they either a) down-regulated their negative affective response to negative images via cognitive reappraisal or b) attended the images without changing their affective response. During the task, the Late Positive Potential (LPP), gaze fixations on emotional image aspects, and self-reported affective responses were collected simultaneously. ResultsCompared to HCs, adolescents with MD demonstrated reduced ER success based on self-report but did not differ in LPP amplitudes. Participants in both groups showed increased amplitudes in the middle LPP window when they reappraised negative pictures compared to when they attended them. Only in the HC group, increased LPP amplitudes during reappraisal were paralleled by more positive affective responses. LimitationThe applied stimuli were part of picture databases and might therefore have limited self-relevance. ConclusionsIncreased LPP amplitude during ER in both groups might be specific to adolescence and might suggest that ER at this age is challenging and requires a high amount of cognitive resources. These findings provide an important starting point for future interventional studies in youth MD.

Assessing cocaine motivational value: Comparison of brain reactivity bias toward cocaine cues and cocaine demand.

The behavioral economic measure drug demand and the neural measure late positive potential (LPP) are two measures of motivational value that have been associated with drug relapse risk and treatment outcomes. Despite having overlapping themes, no studies have directly compared drug demand and LPP. Participants (N = 59) included treatment-seeking individuals with cocaine use disorder that had completed both a baseline cocaine demand task and an electroencephalogram (EEG) picture-viewing task of drug-related and pleasant picture cues. Associations between the LPP difference score amplitude (drug-pleasant) and five demand indices (Q₀, essential value [EV], Omax, Pmax, and breakpoint [BP]) were evaluated via Bayesian generalized linear modeling. Positive associations (posterior probabilities ≥ 75%) were found between LPP amplitude and four demand indices (Q₀, EV, Omax, BP). These results suggest that individuals who attach greater relevance to cocaine cues also exhibit greater valuation of cocaine reward. Implications for incorporating methodology from behavioral science and brain imaging are discussed. (PsycInfo Database Record (c) 2022 APA, all rights reserved).

Immediate and lasting effects of different regulation of craving strategies on cue-induced craving and the late positive potential in smokers.

Craving, induced by substance-related cues, contributes to continued substance use and relapse. Therefore, regulation of craving (ROC) is important for treatment success. Distraction involves disengaging from craving-inducing cues; whereas, reappraisal requires engaging with potential risks of substance use. Given this difference in elaboration, we addressed the question whether reappraisal entails lasting advantages over distraction in successful ROC. To elucidate how this is implemented neurally, we examined the late positive potential (LPP) as an electrocortical indicator of motivated attention to cues. N= 62 smokers viewed smoking-related pictures and indicated the degree of craving each picture induced. While viewing the pictures, EEG was recorded, and the participants focused on the long-term negative (LATER) or short-term positive (NOW) consequences of smoking or performed an arithmetic task to distract themselves from processing the pictures (DISTRACT). After a break, all pictures were presented again without regulation instruction (re-exposure). Results revealed that LATER and DISTRACT achieved similar degrees of immediate ROC success, but only LATER had a sustained effect during re-exposure. In contrast, LPP amplitudes were more prominently reduced during DISTRACT than LATER, and there was no difference in LPP amplitudes during re-exposure. These findings imply that it may be beneficial to engage with the risks of drug use (reappraisal) rather than avoiding triggers of craving (distraction). However, these effects do not seem to be mediated by lasting changes in cue-related motivated attention (LPP).

Neuroanatomical Correlates of the Late Positive Potential in Youth with Pediatric Bipolar Disorder.

The late positive potential (LPP) could be a marker of emotion dysregulation in youth with pediatric bipolar disorder (PBD). However, the neuroanatomical correlates of the LPP are still not clarified. To provide cortical and deep gray matter correlates of the LPP in youth, specifically, youth with PBD. Twenty-four 7 to 17 years-old children with PBD and 28 healthy controls (HC) underwent cortical thickness and deep gray matter volumes measurements through magnetic resonance imaging and LPP measurement elicited by passively viewing emotional faces through electroencephalography. T-tests compared group differences in LPP, cortical thickness, and deep gray matter volumes. Linear regressions tested the relationship between LPP amplitude and cortical thickness/deep gray matter volumes. PBD had a more pronounced LPP amplitude for happy faces and a thinner cortex in prefrontal areas than HC. While considering both groups, a higher LPP amplitude was associated with a thicker cortex across occipital and frontal lobes, and with a smaller right globus pallidus volume. In addition, a higher LPP amplitude for happy faces was associated with smaller left caudate and left globus pallidus volumes across both groups. Finally, the LPP amplitude correlated negatively with right precentral gyrus thickness across youth with PBD, but positively across HC. Neural correlates of LPP in youth included fronto-occipital areas that have been associated also with emotion processing and control. The opposite relationship between BPD and HC of LPP amplitude and right precentral gyrus thickness might explain the inefficacy of the emotional control system in PBD.

Effect of Taste-Induced Mood on ERP and Emotional Assessment of Images.

Tastes affect the body and our emotions. We used tasteless, sweet, and bitter stimuli to induce participants' moods, and we examined the effect of mood on an emotional evaluation of pleasant, neutral, and unpleasant images using event-related potentials, N2, N400, and late positive potential (LPP), which reflect emotional evaluation in the brain. The results indicated that mood valence was most positive for sweetness and most negative for bitterness. Moreover, there was no significant mood effect on subjective valence ratings of emotional images. Furthermore, the N2 amplitude, which is related to the early semantic processing of preceding stimuli, was unaffected by the taste induced mood. In contrast, we found that the N400 amplitude, which is related to the mismatch of emotional valence between stimuli, increased significantly for unpleasant images when participants were in a positive rather than negative mood state. Also, the LPP amplitude, which is related to the emotional valence of images, showed only the main effect of the images' emotional valence. The N2's results suggest that the early semantic processing of taste stimuli might have had a negligible impact on emotional evaluation because taste stimuli minimize semantic processing that accompanies mood induction. In contrast, the N400 reflected the effects of the induced mood, and the LPP reflected the impact of the valence of emotional images. The use of taste stimuli to induce mood revealed different brain processing of taste-induced mood effects on emotional evaluation, including N2's involvement in semantic processing, N400's involvement in matching emotions between mood and stimuli, and LPP's involvement in subjective evaluations of stimuli.

Individual differences in late positive potential amplitude and theta power predict cue-induced eating

Cue-induced reward-seeking behaviors are regulated by both the affective and cognitive control systems of the brain. This study aimed at investigating how individual differences in affective and cognitive responses to cues predicting food rewards contribute to the regulation of cue-induced eating. We recorded electroencephalogram (EEG) from 59 adults while they viewed emotional and food-related images that preceded the delivery of food rewards (candies) or non-food objects (beads). We measured the amplitude of the late positive potential (LPP) in response to a variety of motivationally relevant images and power in the theta (4-8 Hz) frequency band after candies or beads were dispensed to the participants. We found that individuals with larger LPP responses to food images than to pleasant images (C>P group) ate significantly more during the experiment than those with the opposite response pattern (P>C group, p < 0.001). Furthermore, we found that individuals with higher theta power after dispensation of the candy than of the bead (θCA>θBE) ate significantly more than those with the opposite response pattern (θBE>θCA, p < 0.001). Finally, we found that the crossed P>C and θBE>θCA group ate less (p < 0.001) than did the other three groups formed by crossing the LPP and theta group assignments, who exhibited similar eating behavior on average (p = 0.662). These findings demonstrate that individual differences in both affective and cognitive responses to reward-related cues underlie vulnerability to cue-induced behaviors, underscoring the need for individualized treatments to mitigate maladaptive behaviors.