Stress and Perception of Emotional Stimuli: Long-term Stress Rewiring the Brain

Khosrowabadi, Reza

doi:10.29252/nirp.bcn.9.2.107

Volume 9, Issue 2 (March & April 2018 2018) BCN 2018, 9(2): 107-120 | Back to browse issues page

‎ 10.29252/nirp.bcn.9.2.107

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Khosrowabadi R. Stress and Perception of Emotional Stimuli: Long-term Stress Rewiring the Brain. BCN 2018; 9 (2) :107-120
URL: http://bcn.iums.ac.ir/article-1-791-en.html

Stress and Perception of Emotional Stimuli: Long-term Stress Rewiring the Brain

Reza Khosrowabadi ^*

Institute for Cognitive and Brain Sciences, Shahid Beheshti University, Tehran, Iran.

Abstract:

Introduction: Long-term stressful situations can drastically influence one’s mental life. However, the effect of mental stress on recognition of emotional stimuli needs to be explored. In this study, recognition of emotional stimuli in a stressful situation was investigated. Four emotional conditions, including positive and negative states in both low and high levels of arousal were analyzed.
Methods: Twenty-six healthy right-handed university students were recruited within or after examination period. Participants’ stress conditions were measured using the Perceived Stress Scale-14 (PSS-14). All participants were exposed to some audio-visual emotional stimuli while their brains responses’ were measured using the Electroencephalography (EEG) technique. During the experiment, the subject’s perception of emotional stimuli is evaluated using the Self-Assessment Manikin (SAM) questionnaire. After recording, EEG signatures of emotional states were estimated from connectivity patterns among 8 brain regions. Connectivity patterns were calculated using Phase Slope Index (PSI), Directed Transfer Function (DTF), and Generalized Partial Direct Coherence (GPDC) methods. The EEG-based connectivity features were then labeled with SAM responses. Subsequently, the labeled features were categorized using two different classifiers. Classification accuracy of the system was validated by leave-one-out method.
Results: As expected, performance of the system is significantly improved by grouping the subjects to stressed and stress-free groups. EEG-based connectivity pattern was influenced by mental stress level.
Conclusion: Changes in connectivity patterns related to long-term mental stress have overlapped with changes caused by emotional stimuli. Interestingly, these changes are detectable from EEG data in eyes-closed condition.

Keywords: Long-term stress, Effective connectivity, Electroencephalography (EEG), Emotion

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Type of Study: Original | Subject: Cognitive Neuroscience
Received: 2016/06/17 | Accepted: 2016/09/14 | Published: 2018/03/3

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