Summation and subtraction using a modified autoshaping procedure in pigeons.

Full Abstract

A modified autoshaping paradigm (significantly different from those previously reported in the summation literature) was employed to allow for the simultaneous assessment of stimulus summation and subtraction in pigeons. The response requirements and the probability of food delivery were adjusted such that towards the end of training 12 of 48 trials ended in food delivery, the same proportion as under testing. Stimuli (outlines of squares of three sizes and colors:
A, B, and C) were used that could be presented separately or in any combination of two or three stimuli. Twelve of the pigeons (summation groups) were trained with either A, B, and C or with AB, BC, and CA, and tested with ABC. The remaining 12 pigeons (subtraction groups) received training with ABC but were tested with A, B, and C or with AB, BC, and CA. These groups were further subdivided according to whether stimulus elements were presented either in a concentric or dispersed manner. Summation did not occur; subtraction occurred in the two concentric groups. For interpretation of the results, configural theory, the Rescorla-Wagner model, and the composite-stimulus control model were considered. The results suggest different mechanisms responsible for summation and subtraction.

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Author information

Author/s: Ploog, Bertram O (BO);

Affiliation: College of Staten Island, City University of New York, United States; Graduate School and University Center, City University of New York, United States. ploog(-atsign-)mail.csi.cuny.edu

Journal and publication information

Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't

Journal: Behavioural processes (Behav Processes), published in Netherlands. (Language: eng)

Reference: 2008-Jun; vol 78 (issue 2) : pp 259-68

Dates: Created 2008/04/28; Completed 2008/07/25;

PMID: 18396379, status: MEDLINE (last retrieval date: 11/6/2008)

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