[visionlist] Visual search: spatial frequency

Gisela Müller-Plath g.mueller-plath at psych.uni-halle.de
Wed Feb 21 15:58:51 GMT 2007

Below you will find a paper of mine investigating (and modelling) that 
issue. In our experiments, we defined the target as the item with the 
lowest spatial frequency among homogeneous distractors, we varied the 
target-distractor-similarity, and observed a continuum between parallel 
and more serial searches. So I regard it interesting to investigate 
heterogeneous distractor spatial frequencies now.

Müller-Plath, G. & Pollmann, S. (2003). Determining visual search 
strategies with reaction time models. /Psychological Research/, 67(2), 

Best regards and good luck,
Gisela Mueller-Plath

Raymond Dye Jr schrieb:

>A student has come to me with a potential Master's thesis study examining the question of whether or not the presence of a unique spatial frequency can support a parallel scan of space.  She proposes to present compound gratings of 2, 5, 15 patches (presented in a circular array) in which the target consists of 2, 5, and 12 cycles per degree with distractors consisting of only 2 and 12 c/deg versus a target of 2 and 12 c/degree amongst distractors of 2, 5, and 12 c/d.   She proposes to measure reaction time versus set size in one experiment, then fix the duration at 50 ms and measure d'.  My own background is in spatial hearing, and I am wondering whether of not such an experiment has been conducted in the past.  It seems too obvious for it not to have been done, be we cannot locate it in the literature.
>Best regards,
>Raymond Dye
>visionlist mailing list
>visionlist at visionscience.com

Gisela Mueller-Plath
Department of Psychology
Martin-Luther-University Halle-Wittenberg
Brandbergweg 23
06099 Halle / Saale

Tel. +49-345-5524348
Fax. +49-345-5527302

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