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The needle in the haystack: a comparative evaluation of new methods to extract electrodermal responses in applied settings

Utzerath, Christian (2012) The needle in the haystack: a comparative evaluation of new methods to extract electrodermal responses in applied settings.

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Abstract:In applied settings, experimental control is usually low, whereas inter- and intra- individual variability in response characteristics is high. In deception, many cognitive processes that may elicit slow electrodermal responses (EDR) occur at an unknown timing or may even occur simultaneously. This facilitates superposition of EDR, making them harder to study. Two recent computational approaches - continuous decomposition analysis (CDA) and area under the curve (AUC) have been proposed to extract superposed EDR. They were tested with empirical data from a deception detection experiment against traditional through-to-peak analysis (TTP). In general, we hypothesized that tonic and area measures would be more sensitive than phasic measures. While AUC appeared to be least sensitive, CDA and TTP indexed deception with similar sensitivity, although CDA provided a tonic estimate that was most sensitive. Moreover, within CDA, ISCR (an area measure) was more sensitive than sum of amplitudes and frequency of NS-SCR. The results thus support the hypothesis regarding the temporal characteristics of deceptive EDR. With the measures used, indices of both actual lying and the intention to lie were found, the latter of which was reliably indexed by CDA tonic activity. Moreover, there were physiological markers in phasic EDA when subjects switched from intending to lie to actual lying. Since it is expected that these results translate to similar applications, recommendations are given on research on electrodermal activity in applied sciences in general and in deception detection in particular.
Item Type:Essay (Bachelor)
Faculty:BMS: Behavioural, Management and Social Sciences
Subject:77 psychology
Programme:Psychology BSc (56604)
Link to this item:http://purl.utwente.nl/essays/61878
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