Higher Levels Of Arousal Research Articles

Heart rate variability analysis for the assessment of immersive emotional arousal using virtual reality: Comparing real and virtual scenarios.

Many affective computing studies have developed automatic emotion recognition models, mostly using emotional images, audio and videos. In recent years, virtual reality (VR) has been also used as a method to elicit emotions in laboratory environments. However, there is still a need to analyse the validity of VR in order to extrapolate the results it produces and to assess the similarities and differences in physiological responses provoked by real and virtual environments. We investigated the cardiovascular oscillations of 60 participants during a free exploration of a real museum and its virtualisation viewed through a head-mounted display. The differences between the heart rate variability features in the high and low arousal stimuli conditions were analysed through statistical hypothesis testing; and automatic arousal recognition models were developed across the real and the virtual conditions using a support vector machine algorithm with recursive feature selection. The subjects' self-assessments suggested that both museums elicited low and high arousal levels. In addition, the real museum showed differences in terms of cardiovascular responses, differences in vagal activity, while arousal recognition reached 72.92% accuracy. However, we did not find the same arousal-based autonomic nervous system change pattern during the virtual museum exploration. The results showed that, while the direct virtualisation of a real environment might be self-reported as evoking psychological arousal, it does not necessarily evoke the same cardiovascular changes as a real arousing elicitation. These contribute to the understanding of the use of VR in emotion recognition research; future research is needed to study arousal and emotion elicitation in immersive VR.

Affective Modulation of Working Memory Maintenance: The Role of Positive and Negative Emotions.

The present study investigated the impact of task-irrelevant emotional images on the retention of information in spatial working memory (WM). Two experiments employed a delayed matching to-sample task where participants had to maintain the locations of four briefly presented squares. After a short retention interval, a probe item appeared and participants were required to indicate whether the probe position matched one of the previously occupied square positions. During the retention interval, task-irrelevant negative, positive, or neutral emotional pictures were presented. The results revealed a dissociation between negative and positive affect on the participants' ability to hold spatial locations in WM. While negative affective pictures reduced WM capacity, positive pictures increased WM capacity relative to the neutral images. Moreover, the specific valence and arousal of a given emotional picture was also related to WM performance: While higher valence enhanced WM capacity, higher levels of arousal in turn reduced WM capacity. Together, our findings suggest that emotions up- or down-regulate attention to items in WM and thus modulate the short term storage of visual information in memory.

Physiological arousal variability accompanying relations-oriented behaviors of effective leaders: Triangulating skin conductance, video-based behavior coding and perceived effectiveness

With the aim of extending the healthy physiological variability thesis to Leadership Studies, we examined the hypothesized links among leaders' within-person variability in physiological arousal, their task- and relations-oriented behaviors and their overall effectiveness. During regularly-held staff meetings, wristband skin sensors and video cameras captured synchronized physiological and fine-grained behavioral data of 36 leaders within one organization. Perceived leader effectiveness ratings were obtained from their followers. Multi-level log-linear analyses showed no elevated levels of arousal during the task-oriented behaviors of both the highly effective and the less effective leaders. The highly effective leaders showed a significantly greater likelihood of high levels of physiological arousal during positive and negative relations-oriented behaviors. We thus report a physiological correlate of relations-oriented leader behavior; especially among the most effective leaders, higher levels of arousal co-occurred with their positive and negative relations-oriented behavior in the meetings. Having used two high-resolution methods to advance insights about effective organizational leadership, this field study illuminates the importance of capturing the co-occurrence of within-person variability in leaders' bodily responses and their precisely measured behaviors over time in a functional social setting at work.

Dual perspectives on art therapy and EMDR for the treatment of complex childhood trauma

ABSTRACT Background This article explores art therapy and EMDR for the treatment of complex PTSD caused by childhood sexual abuse, from the point of view of both client and therapist. It was co-written with a former client who wishes to remain anonymous. Context The therapeutic work took place in an NHS community setting. The idea of writing together – emerged organically as therapy came to an end, with both client and therapist feeling they have learnt from the process and that sharing these ideas could be beneficial for other practitioners. Approach While psychodynamically informed, much of the intervention followed the main principles of a trauma-focused approach with an emphasis on embodied processes – both in art therapy and EMDR. Outcomes The client made a great deal of progress during therapy and both writers explore the changes and insights that were gained as part of the article, with a particular emphasis on using interoceptive skills to enhance emotional processing. Conclusions When working with clients who have complex PTSD it is important to be aware of trauma-informed approaches and the role of grounding, stabilisation, embodied experiences and trauma processing. At times, this might be essential in order to help clients manage high levels of emotional arousal in the room, learn to contain their distress and improve their symptoms. Implications for Research More research is required to establish ways in which trauma-informed thinking can be incorporated into art therapy, the link between visual and emotional processing, and whether art therapy can improve interoceptive ability. Plain-language summary This article contains the summary of three years of art therapy and Eye Movement Desensitisation and Reprocessing (EMDR). It was co-written with ‘Rob’ (pseudonym), a male client in his mid-thirties who has a history of childhood sexual abuse and who wishes to remain anonymous. In the paper, Rob provides his account of the intervention while I explain my process as a therapist. I had limited experience of complex trauma work before I met him, and in many ways the journey was transformative for both of us. In my writing, I briefly outline the theoretical basis of my thoughts and choices within our art therapy sessions. I reflect on the way my practice has expanded and changed, in order to incorporate an understanding of the way trauma affects the body and how we can work with the body in art therapy. As an EMDR therapist, I often combine EMDR and art therapy with clients who have complex trauma and believe that these two approaches can complement each other. Therapy with Rob was often difficult to contain and there were times where his risk – of self-harm, substance misuse and suicidal urges – had to be carefully considered and managed. The principles of trauma-informed interventions were crucial for our work together. This includes explaining the current research about trauma to the client, so that the client understands his/her experiences better. It also involves helping clients to feel as calm and safe in the room and in their own bodies as possible, and maintaining an emphasis on body sensations in the here-and-now. The article considers the idea of ‘interoceptive imagery’ as a way of working with the body in art therapy with traumatised clients. Some of Rob's images are explored and a link is provided for a video we co-produced, where he discusses more of his journey and his artwork.

Touching to Feel: Brain Activity During In-Store Consumer Experience.

To gain a deeper understanding of consumers' brain responses during a real-time in-store exploration could help retailers to get much closer to costumers' experience. To our knowledge, this is the first time the specific role of touch has been investigated by means of a neuroscientific approach during consumer in-store experience within the field of sensory marketing. This study explores the presence of distinct cortical brain oscillations in consumers' brain while navigating a store that provides a high level of sensory arousal and being allowed or not to touch products. A 16-channel wireless electroencephalogram (EEG) was applied to 23 healthy participants (mean age = 24.57 years, SD = 3.54), with interest in cosmetics but naive about the store explored. Subjects were assigned to two experimental conditions based on the chance of touching or not touching the products. Cortical oscillations were explored by means of power spectral analysis of the following frequency bands: delta, theta, alpha, and beta. Results highlighted the presence of delta, theta, and beta bands within the frontal brain regions during both sensory conditions. The absence of touch was experienced as a lack of perception that needs cognitive control, as reflected by Delta and Theta band left activation, whereas a right increase of Beta band for touch condition was associated with sustained awareness on the sensory experience. Overall, EEG cortical oscillations' functional meaning could help highlight the neurophysiological implicit responses to tactile conditions and the importance of touch integration in consumers' experience.

Anxiety Disorders - Assessment and Management in General Practice

Anxiety is a normal physiological response to a threat. Anxiety disorders occur when this normal physiological response is associated with high levels of autonomic arousal, erroneous cognitions and dysfunctional coping strategies. Anxiety disorders are highly prevalent and present commonly to general practice. Anxiety disorders are often comorbid with other psychiatric and medical disorders and may be associated with significant morbidity.This article describes the diagnosis, assessment and management of anxiety disorders in the general practice setting.Assessment in patients presenting with anxiety symptoms involves excluding a medical cause, identifying features of specific anxiety disorders as well as other coexisting psychiatric disorders, and assessing the degree of distress. Management options include psychoeducation, psychological treatments (particularly cognitive behaviour therapy) and pharmacological treatments. Patients with a diagnosis of an anxiety disorder can access Medicare funded psychological care under a number of Australian government initiatives. Selective serotonin reuptake inhibitors and serotonin norepinephrine reuptake inhibitors are the first line pharmacological agents used to treat anxiety disorders. Regular review is vital to monitor for clinical improvement and more complex presentations may require specialist psychological or psychiatric referral.

Arousal modulates the motor interference effect stimulated by pictures of threatening animals.

Previous research related to the motor interference effect from dangerous objects indicated that delayed responses to dangerous objects were associated with more positive parietal P3 amplitudes, suggesting that great attentional resources were allocated to evaluate the level of danger (i.e., negative valence). However, arousal covaried with valence in this research. Together with previous studies in which the P3 amplitude was found to be increased along with a higher arousal level in the parietal lobe, we raised the issue that more positive parietal P3 amplitudes might also be affected by a high arousal level. To clarify whether valence or arousal impacted the motor interference effect, this study used a motor priming paradigm mixed with a Go/NoGo task and manipulated the valence (negative, neutral and positive) and arousal (medium and high) of target stimuli. Analysis of the behavioral results identified a significant motor interference effect (longer reaction times (RTs) in the negative valence condition than in the neutral valence condition) at the medium arousal level and an increased effect size (increment of RT difference) at the high arousal level. The results indicated that negative valence stimuli may interfere with the prime elicited motor preparation more strongly at the high arousal level than at the medium arousal level. The ERP results identified larger centroparietal P3 amplitudes for the negative valence condition than for the neutral valence condition at a high arousal level. However, the inverse result, i.e., lower centroparietal P3 amplitudes for the negative valence condition than for the neutral valence condition, was observed at a medium arousal level. The ERP results further indicated that the effect size of the behavioral motor interference effect increased because subjects are more sensitive to the negative valence stimuli at the high arousal level than at the medium arousal level. Furthermore, the motor interference effect is related to the negative valence rather than emotionality of the target stimuli because different result patterns emerged between the positive and negative valence conditions. Detailed processes underlying the interaction between valence and arousal effects are discussed.

Identification of Perceived Self-Efficacy to Predict Student’s Awareness in Career Readiness

Research found that self-efficacy has an important role in the development of students’ career cognitive skills. Besides, there still needs further research in self-efficacy, particularly in career readiness. The authors conduct this continuing study is to determine the effect of understanding perceived self-efficacy on student’s awareness in career readiness (mastery experience, vicarious experience, social persuasion, and emotional arousal). Data collected using a self-report of the Self-Efficacy Scale in Career Readiness (SESCR), semi-structured interview, and observation of student’s behavior between both participants with the high and low level of self-efficacy. In the current study, 100 students involved based on their convenience. Results showed that 66% of participants have a high mastery experience, 69% with high vicarious experience, 76% have a high percentage in social persuasion, and 70% have a high level of emotional arousal to understanding their career readiness. The results also showed perceived self-efficacy predicts student’s awareness of career readiness based on gender.

Phasic activation of the locus coeruleus attenuates the acoustic startle response by increasing cortical arousal

An alerting sound elicits the Acoustic Startle Response (ASR) that is dependent on the sound volume and organisms’ state, which is regulated by neuromodulatory centers. The locus coeruleus (LC) neurons respond to salient stimuli and noradrenaline release affects sensory processing, including auditory. The LC hyperactivity is detrimental for sensorimotor gating. We report here that priming microstimulation of the LC (100-ms at 20, 50, and 100 Hz) attenuated the ASR in rats. The ASR reduction scaled with frequency and 100 Hz-stimulation mimicked pre-exposure to a non-startling tone (prepulse). A rapid (~ 40 ms) EEG desynchronization following the LC stimulation suggested that the ASR reduction was due to elevated cortical arousal. The effects of LC stimulation on the ASR and EEG were consistent with systematic relationships between the ASR, awake/sleep state, and the cortical arousal level; for that matter, a lower ASR amplitude corresponded to a higher arousal level. Thus, the LC appears to modulate the ASR circuit via its diffuse ascending projections to the forebrain saliency network. The LC modulation directly in the brainstem and/or spinal cord may also play a role. Our findings suggest the LC as a part of the brain circuitry regulating the ASR, while underlying neurophysiological mechanisms require further investigation.

Closed-Loop Cognitive Stress Regulation Using Fuzzy Control in Wearable-Machine Interface Architectures

Keeping cognitive stress at a healthy range can improve the overall quality of life: helping subjects to decrease their high levels of arousal, which will make them relaxed, and elevate their low levels of arousal, which could increase their engagement. With recent advances in wearable technologies, collected skin conductance data provides us with valuable information regarding ones' cognitive stress-related state. In this research, we aim to create a simulation environment to control a cognitive stress-related state in a closed-loop manner. Toward this goal, by analyzing the collected skin conductance data from different subjects, we model skin conductance response events as a function of simulated environmental stimuli associated with cognitive stress and relaxation. Then, we estimate the hidden stress-related state by employing Bayesian filtering. Finally, we design a fuzzy control structure to close the loop in the simulation environment. Particularly, we design two classes of controllers: (1) an inhibitory controller for reducing cognitive stress and (2) an excitatory controller for increasing cognitive stress. We extend our previous work by implementing the proposed approach on multiple subjects' profiles. Final results confirm that our simulated skin conductance responses are in agreement with experimental data. In a simulation study based on experimental data, we illustrate the feasibility of designing both excitatory and inhibitory closed-loop wearable-machine interface architectures to regulate the estimated cognitive stress state. Due to the increased ubiquity of wearable devices capable of measuring cognitive stress-related variables, the proposed architecture is an initial step to treating cognitive disorders using non-invasive brain state decoding.

Difference of thermal patterns of the face and neck regions in states of physical and mental stresses

Systems for remote detection of a person's state today have enormous potential, but the identification features of states in each system are different. States of mental and physical stress have a huge impact on the performance of the operator's work tasks, and it is important to distinguish between them. The purpose of the work is to review research on identifying states of physical and mental stress by analyzing the temperature of the subject's face and body; conducting experiments aimed at inducing a state of mental stress using the Stroop verbal-color test and physical stress after exercise and analyzing the main differences between the states and the perspectives for their use. Significant differences were found between the mean temperatures of the areas under physical stress and the standard deviation of temperatures under mental stress. The research results can be applied in applications, monitoring systems for the state of operators of complex technical and technological facilities. Stress is as a high level of emotional arousal, usually associated with mental or physical stress. To determine the stressful state of a person, a continuous analysis of physiological signals – ECG, EEG, skin temperature, respiratory rate is carried out. To overcome the limitations associated with the use of contact sensors for recording physiological parameters, methods of computational psychophysiology based on IR-imaging have been used recently. A review of the work on the formation of a thermal picture during and after physical and mental stress is provided. Experiments were carried out to register changes in the thermal patterns of the face and neck regions of 84 subjects after physical exercises and in a state of mental stress when passing the Stroop verbal-color test. A technique for automatic detection of 26 anatomical areas of face and neck regions was developed. The average value and standard deviation of temperatures of all selected areas of the face and neck regions in a state of physical stress are lower than in other states. The lowest temperature in a state of physical stress is observed in the area of the face under the nose and above the lip, which can be explained by the increased respiratory rate that occurs during and after exercise. In general, the low temperature readings compared to other conditions under consideration can be explained by increased sweating, lowering body temperature and narrowing of the lumen of blood vessels observed during exercise. Under mental stress, the average temperature values remain the same as in normal state, however, the standard deviation exceeds the same values during stress when passing the Stroop color test. Such leaps are especially noticeable in areas No. 5 and 6 – the inner corners of the eyes, as well as No. 21 and 22 – the area of the face under the nose, which is explained by the concentration of attention during the test and the frequent change in RR (increase/decrease in RR). Accounting for such changes will help expand the capabilities of new applications for assessing the current state of the subject.

Using bodily postures in the treatment of anorexia nervosa: Effects of power posing on interoception and affective states.

Power posing involves the adoption of an expansive bodily posture. This study examined whether power posing could benefit individuals with anorexia nervosa (AN) and women with normal weight in regards to interoceptive ability and affective states. Participants included 50 inpatients and outpatients with AN as well as 51 normal-weight women. Interoceptive accuracy (IAcc), measured by the heartbeat tracking task and interoceptive sensibility (IS), measured by confidence ratings, were assessed at baseline, after a single power posing session and after 1 week of daily training. Also, the short-term effects of power posing on subjective feelings of dominance, pleasantness, and arousal were investigated. Both groups increased in their IAcc after one power posing session. Also, there was a significant main effect of time on feelings of dominance and pleasantness in the short-term. Women with AN displayed lower levels of IS, dominance, and pleasantness as well as higher levels of arousal than women without AN. These findings suggest that power posing has the potential to increase IAcc, subjective feelings of power and pleasant affect in the short-term. Further research should investigate which mechanisms foster the effectiveness of this intervention to tailor it to the needs of women with AN.

Arousal influences olfactory abilities in adults with different degree of food neophobia

Food neophobia, i.e., the aversion to novel foods, and olfaction are both factors strongly affecting food choices. Mounting evidence suggests a higher arousal towards food as a key factor underlying the reluctance to eat what is unfamiliar to us. As the role of olfaction behind this phenomenon is poorly understood, we explored the associations between food neophobia and trait anxiety, olfactory functions (odor threshold, discrimination and identification) and retronasal aroma release from a reference food in a healthy cohort of 83 adult volunteers. We grouped participants in Low-Neophobics or neophilics (n = 35), Medium-Neophobics (n = 32) and High-Neophobics (n = 16) according to the widely recognized Food Neophobia Scale. Participants with higher neophobic tendencies were found to have marginally higher trait anxiety levels than neophilics (p = 0.10). A lower global olfactory functioning and odor discrimination abilities characterized High-Neophobics, while Medium-Neophobics showed a higher odor sensitiveness than Low-Neophobics. Lastly, High-Neophobics showed a lower extent of retronasal aroma release, likely due to a shorter duration of oral processing and higher anxiety-related physiological responses (such as breathing rate). In summary, this study supports the assumption that the conflicting relationship that neophobics have with food may be led by higher levels of arousal toward foods, rather than different chemosensory functions.

Valence and arousal of words in visual and conceptual interference control efficiency.

Cognitive control efficiency is susceptible to the emotional state of an individual. The aim of the current experiment was to search for the role of valence and arousal of emotion-laden words in a performance efficiency of a modified emotional Stroop task (EST) combined with the flanker task. Both paradigms allow for the measurement of the interference control, but interference appears on different stages of stimulus processing. In the flanker task, the interference is perceptual, while in EST, it is based on the emotional meaning of stimuli. We expected to find the effects of emotionality of words, that is, arousal and valence levels, for interference measured with EST. In a series of two experiments, the results confirmed that a high arousal level enlarges the reaction latencies to the EST. We also identified interaction between valence and arousal in shaping reaction latencies. We found the flanker congruency effect. We did not find interactions between emotional factors and flanker congruency. This suggests that interference measured with the EST and flanker task are in fact different from one another, and while using the modified EST combined with the flanker task, the word-meaning effects do not interfere with pure perceptual interferences.

Unethical When Insecure: The Effect of Negotiators' Self-efficacy Beliefs on Ethical Behavior

In this study, we use interactive negotiation activities to explore the link between state self-efficacy and deception, a particular kind of unethical – or at least ethically questionable – behavior. More specifically, we investigate whether and how negotiators’ self-efficacy perceptions may make them more or less likely to use deception in negotiation. We argue that individuals with particularly low levels of self-efficacy beliefs in a specific situation are expected to experience high levels of anxiety arousal and tend to interpret this situation as threatening. This, in turn, lead them to adopt a self-defensive attitude that ultimately affects their (un)ethical behavior. We test our hypothesis in two experimental studies, totalizing 260 participants. In Study 1 we manipulate participants' negotiation self-efficacy beliefs with bogus feedback and measure their actual use of ethically questionable tactics in a subsequent interactive negotiation activity. We find that low levels of self-efficacy lead individuals to use more ethically questionable tactics during a negotiation. In study 2, besides the manipulation of self-efficacy, we also manipulate participants' moral disengagement with priming messages to test for its meditating effects. Results suggest that moral disengagement mediates the effects of self-efficacy on (un)ethical behavior. We discuss the theoretical and practical implications of our findings.

Sleep Early After Trauma

Abstract. Posttraumatic stress disorder (PTSD) is characterized by intrusive re-experiencing of emotional memories of a traumatic event. Such memories are formed after exposure to trauma in the context of a cascading stress response including high levels of emotional arousal and stress hormone release. Sleep could be a key modulator of early memory formation and re-consolidation processes. Initial studies have investigated this association in this early time period, that is, hours and days after trauma exposure, and its role in modulating trauma memories and PTSD. The time is thus ripe to integrate findings from these studies. The current review consolidated evidence from five experimental and seven naturalistic studies on the association between trauma, sleep, and the development of intrusive emotional memories and PTSD, respectively. Together, the studies point to a potential protective role of sleep after trauma for the development of intrusive memories and PTSD. Findings regarding key sleep architecture features are more mixed and require additional investigation. The findings are important for prevention and intervention science.

Viewing an alpine environment positively affects emotional analytics in patients with somatoform, depressive and anxiety disorders as well as in healthy controls

BackgroundPatients with somatoform, depressive or anxiety disorders often don’t respond well to medical treatment and experience many side effects. It is thus of clinical relevance to identify alternative, scientifically based, treatments. Our approach is based on the recent evidence that urbanicity has been shown to be associated with an increased risk for mental disorders. Conversely, green and blue environments show a dose-dependent beneficial impact on mental health.MethodsHere we evaluate the effect of viewing stimuli of individuals in an alpine environment on emotional analytics in 183 patients with psychiatric disorders (mostly somatoform, depressive and anxiety disorders) and 315 healthy controls (HC). Emotional analytics (valence: unhappy vs happy, arousal: calm vs excited, dominance: controlled vs in control) were assessed using the Self-Assessment Manikin. Further parameters related to mental health and physical activity were recorded.ResultsEmotional analytics of patients indicated that they felt less happy, less in control and had higher levels of arousal than HC when viewing neutral stimuli. The comparison alpine>neutral stimuli showed a significant positive effect of alpine stimuli on emotional analytics in both groups. Patients and HC both felt attracted to the scenes displayed in the alpine stimuli. Emotional analytics correlated positively with resilience and inversely with perceived stress.ConclusionsPreventive and therapeutic programs for patients with somatoform, depressive and anxiety disorders should consider taking the benefits of natural outdoor environments, such as alpine environments, into account. Organizational barriers which are preventing the implementation of such programs in clinical practice need to be identified and addressed.

Hardiness, Stress and Secondary Trauma in Italian Healthcare and Emergency Workers during the COVID-19 Pandemic

Emergency situations such as the COVID-19 pandemic can lead healthcare and emergency workers to undergo severe stress reactions that increase the risk of developing secondary trauma. Hardiness is a protective factor that reduces the likelihood of negative outcomes such as secondary trauma. In this study, we analyzed the responses to physical, emotional, cognitive, organizational‒relational and COVID-19 stress of 140 healthcare and 96 emergency workers. Decision-making difficulties due to high uncertainty and the fear of contracting the virus and infecting others were also considered. We aimed to detect which stressors caused secondary trauma and to assess the protective power of hardiness. Participants completed the questionnaire online measuring stress, secondary trauma and resilience. We performed a t-test, correlational analysis and hierarchical regression. The healthcare workers had higher levels of stress and arousal than the emergency workers group and those involved in the treatment of COVID-19 were exposed to a large degree of stress and were at high risk of developing secondary trauma. Commitment is associated with high levels of stress, arousal and intrusion, while control shows a protective function. Stress and hardiness result in 37% and 17% of the variance of arousal and intrusion, respectively.

Human listeners' perception of behavioural context and core affect dimensions in chimpanzee vocalizations.

Vocalizations linked to emotional states are partly conserved among phylogenetically related species. This continuity may allow humans to accurately infer affective information from vocalizations produced by chimpanzees. In two pre-registered experiments, we examine human listeners' ability to infer behavioural contexts (e.g. discovering food) and core affect dimensions (arousal and valence) from 155 vocalizations produced by 66 chimpanzees in 10 different positive and negative contexts at high, medium or low arousal levels. In experiment 1, listeners (n = 310), categorized the vocalizations in a forced-choice task with 10 response options, and rated arousal and valence. In experiment 2, participants (n = 3120) matched vocalizations to production contexts using yes/no response options. The results show that listeners were accurate at matching vocalizations of most contexts in addition to inferring arousal and valence. Judgments were more accurate for negative as compared to positive vocalizations. An acoustic analysis demonstrated that, listeners made use of brightness and duration cues, and relied on noisiness in making context judgements, and pitch to infer core affect dimensions. Overall, the results suggest that human listeners can infer affective information from chimpanzee vocalizations beyond core affect, indicating phylogenetic continuity in the mapping of vocalizations to behavioural contexts.

Intentions Recognition of EEG Signals with High Arousal Degree for Complex Task.

This paper presents a novel electroencephalography (EEG) evoked paradigm based on neurological rehabilitation. By implementing a conceptual model "cup-and-ball" system, EEG signals in manipulating the dynamic constrained objects are generated. Based on the operational EEG signals, a method is proposed to recognize different mental intentions. Under the manipulating task with a high arousal level, common spatial patterns (CSP) is used to extract and optimize features of the EEG signals from ten participants. Quadratic discriminant analysis (QDA) is implemented on EEG signals in different dimensions to identify different EEG patterns. The cross-validation is used to make classifier adaptive to a given data set. The receiver operating characteristic (ROC) curves are presented to illustrate recognition performance. The classification effect of QDA is verified by paired t-test (P < 0.001). Based on the proposed method, the average accuracy of mental intentions is 0.9857 ± 0.0191 and the area under the ROC curve (AUC) is 0.9665 ± 0.0291. The performance of QDA is also compared with the other three classifiers such as the support vector machine (SVM), the decision tree (DT) and the k-nearest neighborhood (k-NN) rule. The results suggest that the proposed method is very competitive with other methods.