Motivational Manipulation Effect on Sensitivity and Response Bias on Risky as Compared with Conservative People: A Signal Detection Theory Based Analysis

Document Type : Research Paper

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Abstract

Signal detection theory (SDT) has consisting of two basic components: A perceptual component, which has to do with the effect of presenting a signal on an observer's perception, and a decision component (criteria), which has to do with an observer's use of response criteria. In the present study, the effect of motivational manipulating has been investigated on the sensivity and response bias in risky people. 34 students of Tabriz Azad University were selected by convenience sampling. Based on scores in the Zuckerman sensation seeking and Eysenck impulsivity questionnaires they were put in risky (9 males and 8 females) and conservative (8 males and 9 females) groups and computer tasks related to the motivational manipulation was performed on them. The results were analyzed by the use of SDT and mixed two-way analysis of variance.
Findings indicated that risky indiviuals in tasks with low scores and conservative indiviuals in task with high scores have had high response discrimination. Since manipulating of ratio affected the response sensitivity; people's discrimination has been more in tasks with low rates than in high rate ones.  Score manipulation has affected neither indiviuals nor group’s response bias. But indiviual's response bias in high rate tasks has been less than the low rate ones. As well as risky indiviuals in tasks with low rates, and conservative indiviuals in tasks with high rates, have had a more conservative criterion. So it can be concluded that personality variables in dealing with motivational variables affect response sensitivity and bias.

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Journal of Modern Psychological Researches
Volume 8, Issue 31 - Serial Number 31
December 2013
Pages 175-200

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History

  • Receive Date: 26 December 2015
  • Accept Date: 26 December 2015

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