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A Map of perceived speed at low and high contrast across the spatio-temporal frequency surface

Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/157457

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Title: A Map of perceived speed at low and high contrast across the spatio-temporal frequency surface
Related: AVA Christmas Meeting (19 December 2011 : York, England)
Related: AVA Christmas Meeting 2011
Related: http://www.theava.net/conf/index.php?conference=Meeting&schedConf=X2011&page=paper&op=view&path[]=348
Publisher: 2011
Date: 2011
Author/Creator: Brooks, Kevin R
Description: Variations of perceived speed with spatial frequency (SF), temporal frequency (TF), and contrast have been known for many years. However, these effects have largely been studied in isolation, preventing comparison of the perceived speed of stimuli across the spatio-temporal frequency surface. We present the first systematic study to establish the perceived speed of high and low contrast (70% and 7%) stimuli across a broad range of Fourier parameters (SFs from 0.25-8c/deg; TFs from 2-16Hz; speeds from 0.25-64deg/s). In a temporal “yes-no” speed discrimination paradigm, participants indicated whether a grating (standard: fixed speed) or a high contrast dot pattern (test: variable speed) appeared faster. Points of subjective equality (PSEs) and just noticeable differences (JNDs) were established from the fitting of cumulative Gaussian functions. Test dot patterns had the same general form for all conditions of standard grating SF and TF, allowing for the comparison of PSEs and JNDs across Fourier space. Results showed that Weber fractions showed little variation over a broad range of spatio-temporal parameters, and across contrast values. As in many previous reports, high contrast stimuli appeared faster than low contrast stimuli in the vast majority of cases, with some idiosyncratic exceptions. Generally, perceived speed increased with spatial frequency, particularly for low temporal frequency stimuli. The implications of these results for models of human speed perception are discussed.
Description: 1 page(s)
Resource Type: conference paper abstract
Organisation: Macquarie University. Dept. of Psychology

Identifier: http://hdl.handle.net/1959.14/157457
Identifier: mq_res-20120215-151628
Language: eng

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