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

Publiceringsår: 2009
Språk: Engelska
Publikation/Tidskrift/Serie: Proceedings of the 25th Annual Meeting of the International Society for Psychophysics
Dokumenttyp: Konferensbidrag
Förlag: International Society for Psychophysics


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.


  • Psychology


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