Muhammad, Saidah Napisah
(2016)
Identifying the differences of neural correlate on N200 and P300 event related potential (ERP) components from visual stilmuli between extraversion and ambiversion type of personality.
Masters thesis, Universiti Sains Malaysia.
Abstract
Studies that explore neurophysiological correlates with personality traits have
commonly used event-related potential (ERP) during a visual oddball task with
results being the main changes in the N200 and P300 components. Besides that, the
science of the brain of each personality suggested there are differences in nature and
how they react towards stimuli might be differ between personalities. The objectives
of this study are to determine the amplitude and latency of P300 ERP component
between extravert and ambivert trait of personality from visual stimuli and to
determine the amplitude and latency of N200 ERP component between extravert and
ambivert trait of personality from visual stimuli using 128-electrode sensor net. Two
groups of subjects, one consists of 19 displaying the extraversion trait and the other
20 subjects displaying ambiverts trait. Students with neuropsychological problems
and introverts are excluded as a trait controlled. Participants completed a visual
oddball task by pushed button’1’ or ‘2’ is see standard (O) or target (X) stimuli
respectively. The amplitude and latency of P300 and N200 was observed and
determined. The results obtained was analyzed using Mann Whitney test and the
Wilcoxon test measured from nine electrode sites. Mann Whitney test revealed that
there is no significant difference for amplitude and latency between ambivert and
extravert because less electrodes demonstrated the differences between those
personalities. However, Wilcoxon Test that used to discriminate the standard and
target within personalities has determined that extravert showed more significant
differences for amplitude and latency of N200 and P300. However, Chi Square test
has proved that there is no association between the significant electrode and the ERP
components. The future work may required better explanation of neural processing
using different paradigm and methodologies to prove that ambivert has different
neural correlate than extravert.
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