Evidence of structure and persistence in motivational attraction to serial Pavlovian cues
- Department of Psychological and Brain Sciences, Dartmouth College, Hanover, New Hampshire 03755, USA
- Corresponding author: elizabeth.b.smedley.gr{at}dartmouth.edu
Abstract
Sign-tracking is a form of autoshaping where animals develop conditioned responding directed toward stimuli predictive of an outcome even though the outcome is not contingent on the animal's behavior. Sign-tracking behaviors are thought to arise out of the attribution of incentive salience (i.e., motivational value) to reward-predictive cues. It is not known how incentive salience would be attributed to serially occurring cues, despite cues often occurring in a sequence in the real world as reward approaches. The experiments presented here demonstrate that reward-proximal cue responding is not altered by the presence of a distal reward cue (Experiment 1), and similarly that reward-distal cue responding which animals favor, is not altered by the presence of a reward-proximal cue (Experiment 2). Extinction of reward-proximal cues after training of the serial sequence leads to a generalized reduction in lever responding (Experiment 3). Together, we show that both Pavlovian serial lever cues acquire motivational value. These experiments also provide support to the notion that sign-tracking responses are insensitive to changes in outcome value, and that responding to serial cues creates a distinct context for outcome value.
Footnotes
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Article is online at http://www.learnmem.org/cgi/doi/10.1101/lm.046599.117.
- Received October 12, 2017.
- Accepted December 5, 2017.
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