Abstract
Objective: Neuroticism is a medical condition associated with negative affect and is considered to predispose one to mental disorders. This study examined the effectsof arousal-evoking stimuli of various strengths on the severity of neuroticism.
 Materials and Methods: In the Event Related Potential (ERP)/electroencephalograph (EEG) recording session that was held at the Clinical Neuroscience Laboratory at a local hospital, Electroencephalogram was recorded in 58 participants (N=29 for moderate neuroticism and 29 for mild neuroticism) after they were screened for the severity of the neurotic trait. Universal emotional pictures were chosen randomly from the International Affective Picture System (IAPS) and were used as visual stimuli in the experiment. Visual stimuli weredivided into three categories (high, moderate, low) based on the IAPS normative mean values of arousal.
 Results: The significant interaction effect of P300 latency between neuroticism and arousal strength was found in the mid-frontal region. Meanwhile, independent of neuroticism, the main effects of arousal strength of the P300 (amplitude and latency) and N200 (latency) were observed in the mid-central region.
 Conclusion: There is a significant interaction between the severity of neuroticism and the emotional arousal strength, thus, points to the implication of the emotion process in the brain rewards system especially among individuals with neuroticism.
 Bangladesh Journal of Medical Science Vol.19(2) 2020 p.262-267
Highlights
Neuroticism is a personality trait that is associated with the experience of negative affectand social dysfunction and has been recognized as a medical condition that could potentially develope into mental disorders.1,2,3,4,5 Biological and anatomical data had shown the impact of neurotic trait on emotional responses
It was found that the skin conductance reactivity was greater among those with high neurotic symptomatology, than stable participants.6. This fact was reinforced by the finding that individual with high level of neuroticism experienced decreased reward processing which was associated with reduced sustained activation in the orbitofrontal cortex (OFC), as well as decreased valence processing in the right temporal lobe when responding to emotional images
For P300 latency, with the exception of mid-central [F (1.90, 106.30) = 2.46, ns] and midparietal [F [2, 55] = 0.23, ns], the interaction effect between neuroticism and arousal strength was found significant in the mid-frontal region [F [2, 112] = 3.44, p
Summary
Neuroticism is a personality trait that is associated with the experience of negative affectand social dysfunction and has been recognized as a medical condition that could potentially develope into mental disorders. Biological and anatomical data had shown the impact of neurotic trait on emotional responses. It was found that the skin conductance reactivity was greater among those with high neurotic symptomatology, than stable participants.. It was found that the skin conductance reactivity was greater among those with high neurotic symptomatology, than stable participants.6 This fact was reinforced by the finding that individual with high level of neuroticism experienced decreased reward processing which was associated with reduced sustained activation in the orbitofrontal cortex (OFC), as well as decreased valence processing in the right temporal lobe when responding to emotional images.. In a study among sample high in neuroticism, the N200 amplitude was found increased when participants responded to high and mild levels of pleasant stimuli (as based on valence domain) than neutral stimuli.. The P3b for example, was seen at several posterior sites with high amplitude when one responded to unpleasant emotional stimuli.
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