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Korean Journal of Social and Personality Psychology

ISSN : 1229-0653

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Vol.28 No.3

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Effects of the Number of Trials on Test Results in P300-based Concealed Information Test

Korean Journal of Social and Personality Psychology / Korean Journal of Social and Personality Psychology, (P)1229-0653;
2014, v.28 no.3, pp.61-79
https://doi.org/10.21193/kjspp.2014.28.3.004


& (2014). Effects of the Number of Trials on Test Results in P300-based Concealed Information Test. Korean Journal of Social and Personality Psychology, 28(3), 61-79, https://doi.org/10.21193/kjspp.2014.28.3.004

Abstract

The number of trials can influence P300-based concealed information test (P300-based CIT) in two ways. First, as the number of trial increases, the P300 amplitude is likely to reduce due to habituation. If P300 amplitude decreases, accuracy rate of P300 CIT would be declined. Second, as the number of trial increases, the power of test increases and then the accuracy rate would also be increased. This study is to verify whether the accuracy rate of P300 CIT declines or improves as the number of trials increases. After twenty-four participants performed a mock crime, lie detection test was administered to them by using the P300 CIT. Half of the participants was exposed to photo stimuli, and the other half was presented with letter stimuli. A target stimulus, a probe stimulus, and four irrelevant stimuli were presented 30 times in one block, and four blocks were presented to each participant. Contrary to our expectation, P300 amplitude to the target stimulus was smallest in the first block and was largest in the fourth block. P300 amplitude to the relevant stimulus and to the irrelevant stimuli tended to decrease slightly at the second half of the experiment. In bootstrapped amplitude difference tests, there was no significant difference in the accuracy rate as the number of blocks increase. In bootstrapped correlation difference tests, the accuracy rate tended to be lower when only the first block was used, compared to that when several blocks were included. There was no significant difference between the photo stimuli and the letter stimuli in both bootstrapped tests. Reasons why P300 amplitude by a target stimulus was increased and the bootstrapped correlation difference tests were impacted by the number of trials were discussed.

keywords
P300, 숨긴정보검사, 습관화, 시행수, P300, concealed information test, habituation, the number of trials

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