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Time- order effects in timed brightness and size discrimination of paired visual stimuli

Patching, Geoffrey LU ; Englund, Mats and Hellström, Åke (2009) Fechner Day, 2009 In Proceedings of the 25th Annual Meeting of the International Society for Psychophysics
Abstract
An aim of the present paper is to examine changes in the magnitude and direction of time-order effects with changes in the physical magnitude of the stimuli, overall levels of performance, and with changes in load processing capacity. Increments and decrements in performance are gauged by means of the steepness of psychometric and chronometric functions. Load processing capacity is assessed by dividing integrated hazard functions for stimuli varying congruently along the dimensions of both size and brightness by the sum of those for stimuli varying along either dimension alone. Taken altogether the findings suggest that time–order effects in timed brightness and size discrimination are perceptual, and the relative sensory weighting of... (More)
An aim of the present paper is to examine changes in the magnitude and direction of time-order effects with changes in the physical magnitude of the stimuli, overall levels of performance, and with changes in load processing capacity. Increments and decrements in performance are gauged by means of the steepness of psychometric and chronometric functions. Load processing capacity is assessed by dividing integrated hazard functions for stimuli varying congruently along the dimensions of both size and brightness by the sum of those for stimuli varying along either dimension alone. Taken altogether the findings suggest that time–order effects in timed brightness and size discrimination are perceptual, and the relative sensory weighting of stimulus magnitudes related to the alertness of participants and their capacity to process the stimuli. Implications of these findings for common random walk and diffusion models of sensory discrimination are discussed. (Less)
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publication status
published
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in
Proceedings of the 25th Annual Meeting of the International Society for Psychophysics
publisher
International Society for Psychophysics
conference name
Fechner Day, 2009
language
English
LU publication?
no
id
5417f297-02b3-43d0-8729-ba20c6fbe60c (old id 2374882)
date added to LUP
2012-03-30 13:48:37
date last changed
2016-06-29 09:12:37
@misc{5417f297-02b3-43d0-8729-ba20c6fbe60c,
  abstract     = {An aim of the present paper is to examine changes in the magnitude and direction of time-order effects with changes in the physical magnitude of the stimuli, overall levels of performance, and with changes in load processing capacity. Increments and decrements in performance are gauged by means of the steepness of psychometric and chronometric functions. Load processing capacity is assessed by dividing integrated hazard functions for stimuli varying congruently along the dimensions of both size and brightness by the sum of those for stimuli varying along either dimension alone. Taken altogether the findings suggest that time–order effects in timed brightness and size discrimination are perceptual, and the relative sensory weighting of stimulus magnitudes related to the alertness of participants and their capacity to process the stimuli. Implications of these findings for common random walk and diffusion models of sensory discrimination are discussed.},
  author       = {Patching, Geoffrey and Englund, Mats and Hellström, Åke},
  language     = {eng},
  publisher    = {ARRAY(0xc02e828)},
  series       = {Proceedings of the 25th Annual Meeting of the International Society for Psychophysics},
  title        = {Time- order effects in timed brightness and size discrimination of paired visual stimuli},
  year         = {2009},
}