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Jaśkowski P, Szumska I, Sasin E. Functional Locus of Intensity Effects in Choice Reaction Time Tasks. J PSYCHOPHYSIOL 2009. [DOI: 10.1027/0269-8803.23.3.126] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Long reaction times (RT) paradoxically occur with extremely loud auditory stimuli ( Van der Molen & Keuss, 1979 , 1981 ) or with ultrabright and large visual stimuli ( Jaśkowski & Włodarczyk, 2006 ) when the task requires a response choice. Van der Molen and Keuss (1981 ) hypothesized that this effect results from an arousal-driven elongation of response-selection processes. We tested this hypothesis using visual stimuli and chronopsychophysiological markers. The results showed that the latency of both early (P1 recorded at Oz) and late (P300) evoked potentials decreased monotonically with intensity. In contrast, the latency of stimulus-locked lateralized readiness potentials (LRP) abruptly increased for the most intense stimuli, thus mirroring the reaction time–intensity relationship. Response-locked LRPs revealed no dependency on intensity. These findings suggest that the processes responsible for the van der Molen-Keuss effect influence processing stages that are completed before the onset of LRP. The van der Molen-Keuss effect likely occurs later than those represented by early sensory potentials. This is in keeping with the hypothesis of van der Molen-Keuss.
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Affiliation(s)
- Piotr Jaśkowski
- Department of Cognitive Psychology, University of Finance and Management, Warszawa, Poland
| | - Izabela Szumska
- Department of Cognitive Psychology, University of Finance and Management, Warszawa, Poland
| | - Edyta Sasin
- Department of Cognitive Psychology, University of Finance and Management, Warszawa, Poland
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