High Arousal States Research Articles

Investigation of the Effect of Students' Nodding on Their Arousal Levels in On-Demand Lectures.

Due to COVID-19, various lecture styles are being explored. On-demand lectures are attracting increasing attention due to advantages such as being able to watch without restrictions due to location and time. In contrast, on-demand lectures have disadvantages, such as no interaction with the lecturer, so the quality of on-demand lectures should be improved. Our previous study showed that when participants nod without showing their faces in a real-time remote lecture, their heart rate state changes to arousal and nodding can increase arousal. In this paper, we hypothesize that nodding during on-demand lectures increases participants' arousal levels, and we investigate the relationship between natural and forced nodding and the level of arousal based on heart rate information. Students taking on-demand lectures rarely nod naturally, so we used entrainment to encourage nodding by showing a video of another participant nodding, and by forcing the participants to nod when the other participant nodded in the video. The results showed that only participants who nodded spontaneously changed the value of pNN50, an index of the arousal level, which reflected a state of high arousal after one minute. Thus, participants' nodding in on-demand lectures can increase their arousal levels; however, the nodding must be spontaneous, not forced.

A database of heterogeneous faces for studying naturalistic expressions

Facial expressions are thought to be complex visual signals, critical for communication between social agents. Most prior work aimed at understanding how facial expressions are recognized has relied on stimulus databases featuring posed facial expressions, designed to represent putative emotional categories (such as ‘happy’ and ‘angry’). Here we use an alternative selection strategy to develop the Wild Faces Database (WFD); a set of one thousand images capturing a diverse range of ambient facial behaviors from outside of the laboratory. We characterized the perceived emotional content in these images using a standard categorization task in which participants were asked to classify the apparent facial expression in each image. In addition, participants were asked to indicate the intensity and genuineness of each expression. While modal scores indicate that the WFD captures a range of different emotional expressions, in comparing the WFD to images taken from other, more conventional databases, we found that participants responded more variably and less specifically to the wild-type faces, perhaps indicating that natural expressions are more multiplexed than a categorical model would predict. We argue that this variability can be employed to explore latent dimensions in our mental representation of facial expressions. Further, images in the WFD were rated as less intense and more genuine than images taken from other databases, suggesting a greater degree of authenticity among WFD images. The strong positive correlation between intensity and genuineness scores demonstrating that even the high arousal states captured in the WFD were perceived as authentic. Collectively, these findings highlight the potential utility of the WFD as a new resource for bridging the gap between the laboratory and real world in studies of expression recognition.

Cortical-brainstem interplay during speech perception in older adults with and without hearing loss.

Real time modulation of brainstem frequency-following responses (FFRs) by online changes in cortical arousal state via the corticofugal (top-down) pathway has been demonstrated previously in young adults and is more prominent in the presence of background noise. FFRs during high cortical arousal states also have a stronger relationship with speech perception. Aging is associated with increased auditory brain responses, which might reflect degraded inhibitory processing within the peripheral and ascending pathways, or changes in attentional control regulation via descending auditory pathways. Here, we tested the hypothesis that online corticofugal interplay is impacted by age-related hearing loss. We measured EEG in older adults with normal-hearing (NH) and mild to moderate hearing-loss (HL) while they performed speech identification tasks in different noise backgrounds. We measured α power to index online cortical arousal states during task engagement. Subsequently, we split brainstem speech-FFRs, on a trial-by-trial basis, according to fluctuations in concomitant cortical α power into low or high α FFRs to index cortical-brainstem modulation. We found cortical α power was smaller in the HL than the NH group. In NH listeners, α-FFRs modulation for clear speech (i.e., without noise) also resembled that previously observed in younger adults for speech in noise. Cortical-brainstem modulation was further diminished in HL older adults in the clear condition and by noise in NH older adults. Machine learning classification showed low α FFR frequency spectra yielded higher accuracy for classifying listeners' perceptual performance in both NH and HL participants. Moreover, low α FFRs decreased with increased hearing thresholds at 0.5-2 kHz for clear speech but noise generally reduced low α FFRs in the HL group. Collectively, our study reveals cortical arousal state actively shapes brainstem speech representations and provides a potential new mechanism for older listeners' difficulties perceiving speech in cocktail party-like listening situations in the form of a miss-coordination between cortical and subcortical levels of auditory processing.

Emotion Recognition System Based on Two-Level Ensemble of Deep-Convolutional Neural Network Models

Emotions play a crucial role in human interaction and healthcare. This study introduces an automatic emotion recognition system based on deep learning using electroencephalogram signals. A lightweight pyramidal one-dimensional convolutional neural network model is proposed that involves a small number of learnable parameters. Using the model, a two-level ensemble classifier is designed. Each channel is scanned incrementally in the first level to generate predictions, which are fused using the majority vote. The second level fuses the predictions of all the channels of a signal using a majority vote to predict the emotional state. The method was validated using the public domain challenging benchmark dataset. The electroencephalogram signals over five brain regions were analyzed. The results indicate that the frontal brain region plays a dominant role in two emotion recognition problems (distinguishing high valence vs. low valence and high arousal vs. low arousal states).

The motivational dynamics of arousal and values in promoting sustainable behavior: A cognitive energetics perspective

This research applies Cognitive Energetics Theory (CET) to explain when and why consumers engage in sustainable behavior. Across six studies, we find a positive interaction effect of arousal and openness-to-change on sustainable behaviors. In particular, openness-to-change (vs conservation) increases the likelihood of engaging in effortful sustainable behaviors in a high-arousal state rather than in a low-arousal state. Interestingly, our results reveal that this interactive effect is explained by the tendency of consumers to believe that the target sustainable behavior requires less effort, when they are in a high-arousal state and endorsing openness-to-change. Moreover, perceived effort is positively related to sustainable behavior for experienced consumers but negatively related to the behavior for less experienced consumers. In addition, the effect of value and arousal on perceived effort is stronger among less experienced consumers but attenuated among more experienced consumers. Thus, arousal can serve as a catalyst to enhance value-consistent sustainable behaviors and help the less experienced consumers form habits. These findings contribute to CET by highlighting the important roles that values and arousal play in the motivational forces that drive and restrain sustainable behaviors. The results improve our understanding of how to motivate value-consistent sustainable behaviors, with implications for both marketers and policy-makers.

AGING BODY AS CONTEXT: THE ROLE OF INTEROCEPTIVE AGING IN MID- AND LATE-LIFE EMOTION

Abstract Interoceptive sensations (e.g., racing heart, clenched gut) are often closely tied to emotion. Older adults tend to exhibit reduced sensitivity and awareness of their interoceptive sensations relative to younger adults (e.g., Khalsa et al., 2009; Mikkelsen et al., 2019; Murphy et al., 2019), yet the emotional implications of such interoceptive differences remain unclear. Herein, I present two behavioral cross-sectional studies (N=350) documenting age differences in how adults (18-75 yrs) link their interoceptive sensations to emotions (Study 1: cognitive behavioral task; Study 2: experience sampling). Results reveal that from midlife into late life, coherence between interoceptive sensations and emotions increasingly weakens, both behaviorally and in self-reports. Age effects are most prominent for high arousal sensations and states. These findings provide converging evidence with recent neuroimaging results (MacCormack et al., 2020) showing the importance of interoceptive aging and related shifts in physiological arousal as potential pathways by which emotions transform across adulthood.

Exploring the perception of stress in childhood and early adolescence

Stressful life experiences may jeopardize the healthy development of children. To improve interventions, more knowledge is needed on the perception of stress by children. In adults, stress is regarded as a state of low valence and high arousal. It is unclear whether children perceive stress similarly. In the current study, 35 children of the general population completed three tasks aiming to provide insight into their knowledge of the concept stress. In the first task, participants were asked about their verbal knowledge of the concept stress. In the second task, they rated the valence and arousal of eight emotion-evoking vignettes. In the final task, participants completed an experience sampling survey for at least 1 day, consisting of a stress thermometer and pictorial scales of valence and arousal. Participants’ perception of stress was found to be mainly valence focused. Age and sex were found to play a role in the degree of arousal focus. Older participants differentiated more in arousal levels than younger participants, as did girls in comparison with boys. Because the perception of stress depends on developmental and other individual factors, using stress as a single measurement dimension in a survey is not recommended.

Passive visual stimulation induces fatigue under conditions of high arousal elicited by auditory tasks.

Theories of cognitive fatigue disagree on whether performance decrement is caused by motivational or functional alterations. Here, drawing inspiration from the habituation and visual adaptation literature, we tested the assumption that keeping neural networks active for an extensive period of time entails consequences at the subjective and objective level-the defining characteristics of fatigue-when confounds such as motivation, boredom, and level of skill are controlled. In Experiment 1, we revealed that passive visual stimulation affected the performance of a subsequent task that was carried out in the same portion of visual space. While under conditions of low cognitive load and arousal, participants improved their performance in the stimulated quadrant; the reverse was observed under high arousal conditions. This latter performance decrement correlated also with the reported subjective level of fatigue and occurred while neural responses to the saturating stimulus remained constant, as assessed through steady-state EEG. In subsequent experiments, we replicated and further characterized this performance deterioration effect, revealing its specificity to the stimulated eye and stimulus orientation. Across the three experiments, the decrease in performance was correlated with pupil-linked arousal, suggesting its mediating effect in this phenomenon. In sum, we show that repeated stimulation of neural networks under high-arousal conditions leads to their altered functional performance, a mechanism which may play a role in the development of global cognitive fatigue. (PsycInfo Database Record (c) 2022 APA, all rights reserved).

Complaint De-Escalation Strategies on Social Media

To date, the literature offers multiple suggestions for how to recover from service failures, albeit without explicitly addressing customers’ negative, high-arousal states evoked by the failure. The few studies that do address ways to improve negative emotions after failures focus on face-to-face interactions only. Because many customers today prefer to complain on social media, firms must learn how to effectively de-escalate negative, high-arousal emotions through text-based exchanges to achieve successful service recoveries. With three field studies using natural language processing tools and three preregistered controlled experiments, the current research identifies ways to mitigate negative arousal in text-based social media complaining, specifically, active listening and empathy. In detail, increasing active listening and empathy in the firm response evokes gratitude among customers in high-arousal states, even if the actual failure is not (yet) recovered. These findings provide a new theoretical perspective on the role of customer arousal in service failures and recoveries as well as managerially relevant implications for dealing with public social media complaints.

Valuing high arousal negative states increases negative responses toward outgroups across cultures.

Previous research demonstrates that the more people experience anger, fear, and other high arousal negative states (HAN) on average, the more prejudice and harm they express toward outgroups. Here we demonstrate that valuing HAN-above and beyond actually experiencing HAN-increases people's likelihood of engaging in harm toward cultural outgroups in everyday life. In Study 1, U.S. European Americans (N = 227) read hypothetical scenarios in which a member of another cultural group at school, work, or home made them uncomfortable. As predicted, the more participants ideally wanted to feel HAN, the more negatively they responded to the outgroup member in these scenarios (i.e., the more HAN they felt, the more they viewed harmful actions as appropriate, and the more likely they were to engage in these actions). To assess generalizability, in Study 2, we provide evidence from Canada (n = 162) and Taiwan (n = 170) that despite cultural differences in the valuation of specific types of HAN, wanting to feel HAN still predicted negative responses toward cultural outgroups in both cultures. These findings raise the intriguing possibility that reducing people's valuation of HAN might play an important role in increasing tolerance of cultural diversity in multicultural societies. (PsycInfo Database Record (c) 2022 APA, all rights reserved).

Temporal fluctuations in vigilance and neural networks after sleep deprivation.

Vigilance instability in the sleep-deprived state was deemed to result from the imbalance in thalamic-FPN-DMN circuits (FPN: frontoparietal network; DMN: default mode network), but the behavioural correlation of this neural hypothesis is still unclear. To address this issue, we applied dynamic functional connectivity (DFC) analysis on the task-based fMRI data and detected high arousal state (HAS) and low arousal state (LAS). Relative to HAS, LAS demonstrated higher positive connectivity within task-positive networks (TPN), attenuated TPN-DMN anti-correlation, and greater anti-correlation between cerebral and subcortico-cerebellar networks. Critically, DFC differences between HAS and LAS were correlated with the ongoing vigilance performance in the sleep-deprived state. The current findings confirmed a direct link between vigilance instability and DFC in the thalamic-FPN-DMN circuits. In particular, we postulated that the integration within task-related system and segregation between task-related system and the subcortico-cerebellar system might be the critical neural markers underlying vigilance instability in the sleep-deprived state.

Time-frequency analysis of pupil size modulated by global luminance, arousal, and saccade preparation signals using Hilbert-Huang transform

Pupil size changes constantly and is mainly determined by global luminance signals. In addition, the pupil responds to various cognitive and arousal processes, with larger pupil dilation observed in higher levels of cognitive or arousal processing. Although these task-evoked pupillary responses are extensively used in the pupil research, pupil analysis focusing on the frequency domain, particularly in the context of arousal and cognitive modulations, is less established. Fourier Transform method (FFT) has been used to understand the modulation of task difficulty on pupil oscillations. However, physiological signals are often characterized as non-linear and non-stationary waves, and the conventional spectral analytical method with linearity presumption is less appropriate to reveal modulation dynamics between time and frequency. Here, we used Hilbert-Huang Transform (HHT) to examine the time-frequency modulations on pupil size regulated by arousal, cognitive, and global luminance signals. Consistent with previous research, using FFT, higher spectral densities were obtained with lower luminance background. Moreover, higher spectral densities were found in the high emotional arousal condition. With HHT, we further demonstrated temporal changes on amplitude spectrum and inter-trial phase coherence (ITPC) in each intrinsic mode function (IMF), with stronger amplitudes in higher IMFs (i.e., low frequencies). Moreover, although global luminance, arousal and saccade preparation modulated pupil oscillatory responses, the modulation pattern in different IMFs was different. Together, our results demonstrated dynamics between the time and frequency domain on pupil oscillatory responses, highlighting the importance of examining the time-frequency interactions in the context of various pupil modulations.

Ingressive phonation conveys arousal in human nonverbal vocalizations

ABSTRACT Animals normally vocalise while exhaling. Ingressive, or inspiratory, voice production occurs in humans and many other species, but its communicative function, if any, remains unknown. To test the perceptual effects of ingressive phonation, naturally occurring ingressive syllables in 109 human nonverbal vocalisations (55 laughs, 21 cries, and 33 moans) were experimentally attenuated or morphed into quiet and unvoiced intakes of breath using voice resynthesis technology. Ratings of the intensity of discrete emotions (amusement, sadness, pleasure) and of general arousal in three perceptual experiments revealed that listeners (N = 283) judged vocalisations with attenuated ingressive syllables to be less emotionally intense compared to the originals. Ingressive vocalisations were not experienced as either unnatural or unpleasant, confirming that they are a familiar part of human vocal repertoire. In sum, ingressive phonation can occur in a wide range of human nonverbal vocalisations and typically conveys intense emotion, presumably because listeners associate heavy breathing, imperfect vocal control, and continuous egressive-ingressive vocalising with the physiological state of high arousal. It remains to be seen whether ingressive phonation is a mere byproduct of high arousal or whether it can be exaggerated, and whether its communicative function extends to vocalisations of non-human animals.

A glutamatergic basal forebrain to midbrain circuit mediates wakefulness and defensive behavior

Defensive behavior, a group of responses that evolved due to threatening stimuli, is crucial for animal survival in the natural environment. For defensive measures to be timely and successful, a high arousal state and immediate sleep-to-wakefulness transition are required. Recently, the glutamatergic basal forebrain (BF) has been implicated in sleep-wake regulation; however, the associated physiological functions and underlying neural circuits remain unknown. Here, using in vivo fiber photometry, we found that BF glutamatergic neuron is activated by various threatening stimuli, including predator odor, looming threat, sound, and tail suspension. Optogenetic activation of BF glutamatergic neurons induced a series of context-dependent defensive behaviors in mice, including escape, fleeing, avoidance, and hiding. Similar to the effects of activated BF glutamatergic cell body, photoactivation of BF glutamatergic terminals in the ventral tegmental area (VTA) strongly drove defensive behaviors in mice. Using synchronous electroencephalogram (EEG)/electromyogram (EMG) recording, we showed that photoactivation of the glutamatergic BF-VTA pathway produced an immediate transition from sleep to wakefulness and significantly increased wakefulness. Collectively, our results clearly demonstrated that the glutamatergic BF is a key neural substrate involved in wakefulness and defensive behaviors, and encodes these behaviors through glutamatergic BF-VTA pathway. Overexcitation of the glutamatergic BF-VTA pathway may be implicated in clinical psychiatric diseases characterized by exaggerated defensive responses, such as autism spectrum disorders.

Vocalization and physiological hyperarousal in infant-caregiver dyads where the caregiver has elevated anxiety.

Co-regulation of physiological arousal within the caregiver-child dyad precedes later self-regulation within the individual. Despite the importance of unimpaired self-regulatory development for later adjustment outcomes, little is understood about how early co-regulatory processes can become dysregulated during early life. Aspects of caregiver behavior, such as patterns of anxious speech, may be one factor influencing infant arousal dysregulation. To address this, we made day-long, naturalistic biobehavioral recordings in home settings in caregiver-infant dyads using wearable autonomic devices and miniature microphones. We examined the association between arousal, vocalization intensity, and caregiver anxiety. We found that moments of high physiological arousal in infants were more likely to be accompanied by high caregiver arousal when caregivers had high self-reported trait anxiety. Anxious caregivers were also more likely to vocalize intensely at states of high arousal and produce intense vocalizations that occurred in clusters. High-intensity vocalizations were associated with more sustained increases in autonomic arousal for both anxious caregivers and their infants. Findings indicate that caregiver vocal behavior differs in anxious parents, cooccurs with dyadic arousal dysregulation, and could contribute to physiological arousal transmission. Implications for caregiver vocalization as an intervention target are discussed.

The effects of smartphone assistants' anthropomorphism on consumers' psychological ownership and perceived competence of smartphone assistants

AbstractFew studies on the effects of smartphone assistants' anthropomorphism on consumer behavior have been conducted. This study explored the effects of anthropomorphism on consumers' psychological ownership of smartphone assistants and perceptions of their competence. Moreover, it investigated arousal during smartphone assistant use and examined how relationship norms governing the consumer–smartphone assistant relationship moderate the effects of anthropomorphism on psychological ownership. In study 1, which had a one‐factorial design (high vs. low anthropomorphism), a highly anthropomorphic smartphone assistant was perceived to be more competent. In study 2, which followed the same experimental procedure under a 2 × 2 full factorial design, the anthropomorphism–relationship norms interaction moderated psychological ownership. Psychological ownership fully mediated the effect of anthropomorphism on perceived competence. Study 3 employed a 2 (anthropomorphism: high vs. low) × 2 (arousal: high vs. low) × 2 (relationship norms: exchange vs. communal) full factorial design. In the high arousal condition, anthropomorphism and relationship norms exerted no significant effect on psychological ownership. A conditional indirect effect from anthropomorphism to perceived competence through psychological ownership was only significant under low arousal and adherence to communal relationship norms. In summary, the degree of anthropomorphism influenced perceived competence through psychological ownership. Therefore, companies should incorporate anthropomorphic cues into smartphone assistant design, thereby promoting their personification by consumers and benefiting perceptions of their competence.

Supplemental Material for Valuing High Arousal Negative States Increases Negative Responses Toward Outgroups Across Cultures

Supplemental Material for Valuing High Arousal Negative States Increases Negative Responses Toward Outgroups Across Cultures

Socioemotional Goals and Definitions of Emotion Terms: A Qualitative Analysis Across Age

Major theories of adult development posit that knowledge about emotion might evolve across the lifespan. Socioemotional Selectivity Theory (SST) and the Strength and Vulnerability Integration (SAVI) models imply that the manner in which older (OA) and younger adults (YA) conceptualize emotions may differ in valence, arousal, reference to social partners, time perspective, and the self. Quantitative accounts of age differences in conceptualizations of emotion-terms offer mixed support for theoretical expectations, but many predictions have yet to be tested qualitatively. In this study, 90 OA and 210 YA provided narrative descriptions of 11 (5 positive, 6 negative) emotion-terms. Responses were coded on valence, reference to self/others, and arousal. O/YA used similar synonyms to define emotion-terms. As predicted, YA used high arousal language in their definitions of negative (OR = 10.29, p = 0.018) and positive terms more than OA (i.e. Happy: OR = 1.27, p<0.001); OA referenced other persons such as family and friends (pos: OR = 0.13, p<0.001; neg: OA = 0.32, p=0.002) more than YA. Contrary to predictions, OA self-referenced more often than YA in positive (OR = 0.12, p=0.001) and negative definitions (OR= 0.11, p=0.004); this may be attributed to OA providing more situational examples in their responses than YA. Somewhat consistent with SAVI and SST, OA may reference high-arousal states less when conceptualizing emotions and associate their definitions more with social partners than YA. Future research should address OA greater use of situational examples when defining emotion terms, motivational factors and emotional impact of these age differences.

Feel the beat: cape fur seal males encode their arousal state in their bark rate.

The cape fur seal is one of the most colonial mammal species in the world. Breeding colonies are composed of harems held by mature males (older than 10years) with up to 30 females and their pups, while roaming subadult males (younger and socially immature) are kept away from bulls' territories. As in other pinnipeds, cape fur seals are highly vocal and use acoustic signals in all their social interactions. Males produce barks-short vocalizations always produced in sequences-for territorial defense, mating behaviors, and agonistic interactions. These calls convey information about the sex, age class, and individual identity. This study investigated whether motivational cues such as the arousal state can be encoded in territorial males' barks and whether these cues are decoded by listening sub-adult males. The rate (number of calls per unit of time) and fundamental frequency of barks were found to significantly increase during high arousal state interactions (i.e., male-male confrontation) compared to spontaneous barks. Playback experiments revealed that subadult males responded with a higher level of vigilance when territorial males' barks had a faster bark rate. This mechanism of decoding the bulls' arousal state from barks will likely constitute an advantage for both bulls and the subadult males, by avoiding or reducing physical conflicts, and thereby reducing energy expenditure and the risk of injury. This study is the first experimental evidence of cape fur seals' using vocal rhythmic patterns to modulate their social interactions.

NDNF interneurons, Spartans of the cortical column: Small in number, strong in impact

NDNF selectively labels neurogliaform inhibitory interneurons of layer 1. In this issue of Neuron, Cohen-Kashi Malina etal. (2021) show that NDNF activity is highly correlated with arousal level. During high arousal state, NDNF inhibits the dendrites while disinhibiting the soma of nearby pyramidal neurons.