A New Stimulus Set for Cognitive Research

  1. F. Greg Ashby

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Description: A new stimulus set is described that could prove useful for a wide variety of different cognitive experiments. Each stimulus is a schematic representation of a fish and the stimulus ensemble could potentially be varied on many dimensions. These new stimuli have a number of attractive properties, including 1) a higher degree of ecological validity than most stimuli used in cognitive research, and 2) a large number of qualitatively different types of dimensions that can be varied. Psychophysical properties of the stimuli were studied in two experiments. Experiment 1 measured just noticeable differences on two prominent dimensions, and Experiment 2 used multidimensional scaling to study the structure of the underlying perceptual representations. The result is an ecologically valid stimulus set with a well-understood perceptual representation.

License: CC-By Attribution 4.0 International

Has supplemental materials for A New Stimulus Set for Cognitive Research on PsyArXiv


This is the home of Matlab code to generate the 5 Dimensional Fish Stimuli developed by Rosedahl and Ashby. The code is verified to run with Matlab 2016b Information on how to use the function is currently included in comments at the top of the .m file. The program takes all inputs in actual units of the dimension (angle in degrees, length in pixels, and RGB color). The transformations described...


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