Modeling unidimensional categorization in monkeys.

Full Abstract

The categorization performance of monkeys on a unidimensional perceptual categorization task was examined with reference to decision bound and exemplar theories of categorization. Three rhesus monkeys were presented with stimuli varying along a single dimension, the displacement of a target light from a fixation point. Left or right saccade responses were probabilistically reinforced according to one of three functions, two of which were nonmonotonic at one end of the stimulus space. The monkeys all showed a monotonic increase in response probability as a function of target light displacement in this region, consistent with decision bound theory. Fits of a single-boundary model (GRT, Ashby & Gott, 1988) and two exemplar models--one using a probabilistic response function (GCM; Nosofsky, 1986), the other using a deterministic response function (DEM; Ashby & Maddox, 1993)--revealed overall support for the decision bound model. The results suggest that monkeys used a perceptual decision boundary to perform the task.

Learn Faster Today Improve your study skills

Author information

Author/s: Farrell, Simon (S); Ratcliff, Roger (R); Cherian, Anil (A); Segraves, Mark (M);

Affiliation: Department of Experimental Psychology, University of Bristol, 8 Woodland Road, Clifton, Bristol BS8 ITN, England. simon.farrell(-atsign-)bristol.ac.uk

Grants: R01-EY08212 (Agency:NEI NIH HHS) ; R01-MH59893 (Agency:NIMH NIH HHS)

Journal and publication information

Publication Type: Journal Article; Research Support, N.I.H., Extramural

Journal: Learning & behavior : a Psychonomic Society publication (Learn Behav), published in United States. (Language: eng)

Reference: 2006-Feb; vol 34 (issue 1) : pp 86-101

Dates: Created 2006/06/21; Completed 2006/07/25; Revised 2007/11/14;

PMID: 16786887, status: MEDLINE (last retrieval date: 12/26/2008)

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

External Links for this article (including full text providers, if available):

Click Electronic Full-text Provider Links to see options for finding the electronic full text links to this article. Note there may be a subscription or fee required for access to the full text. See our FAQ for information on finding FREE full text articles.

This article may also be located in paper journal collections available in many libraries. Use the Journal and Publication Information above to find the full article.

MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Macaca mulatta
Models, Statistical
Saccades - physiology
Visual Fields - physiology
Visual Perception

These are the highest related articles currently in the database:

See 100+ related articles.