Title: Neither extended sequential nor simultaneous feature positive training result in modulation of evaluative flavor-flavor conditioning in humans
Authors: Baeyens, Frank ×
Hendrickx, Hilde
Crombez, Geert
Hermans, Dirk #
Issue Date: 1998
Publisher: Academic press ltd
Series Title: Appetite vol:31 issue:2 pages:185-204
Abstract: In previous attempts to induce Pavlovian modulation of human evaluative flavor-favor associations, the recurrent finding was that exposure to a Feature Positive (FP) schedule (XA+/A-), in which flavor A was reinforced by the aversive flavor Tween20 if and only if it was accompanied by a feature stimulus XI did not result in the expected X-modulated dislike for target A, but in simple unconditional A-US associations. The first experiment reported here investigated if more extended training results in a shift from simple A-US learning to the development of X-modulated A-US associations. Participants were exposed to a 32-trial, 4-session sequential FP schedule using flavors both for feature and target stimuli. The modulatory and/or excitatory power of the stimuli was assessed after each training session. After initial training, participants again acquired a simple unmodulated target A-US association. Contrary to expectations, the additional training sessions did not result in participants gradually learning the XA+/A-discrimination, but rather seemed to corroborate the already established A-US association. This was true whether or not participants acquired valid explicit knowledge about the conditional X--> (A-US) relation. The second experiment tested the hypothesis that what can be described as conditional flavor preferences may actually be based on a configural learning process. Participants were exposed to a single-session, eight-trial XA+/A- simultaneous discrimination schedule, the parameters of which were selected so as to enhance the probability of configuring XA: while simultaneously making it likely to observe a pattern of evaluations similar to an X-modulated dislike for A (X was less salient than A). Even though then was good evidence that participants noticed flavor X, they again failed to solve the XA+/A- discrimination and most probably acquired an association between the more salient flavor A and the US. The possibility is discussed that evaluative learning, unlike expectancy learning, might ultimately prove not to be subject to modulation. (C) 1998 Academic Press.
ISSN: 0195-6663
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Psychology of Learning and Experimental Psychopathology
× corresponding author
# (joint) last author

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