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A Conflict Model of Reward-seeking Behavior in Male Rats
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Associative priming and conflict differentially affect two processes underlying cognitive control: Evidence from

Christopher D Erb1, Andrew G McBride2, Stuart Marcovitch2

  • 1School of Psychology, University of Auckland, Auckland, New Zealand. christopher.erb@auckland.ac.nz.

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|March 13, 2019
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Summary

Reaching behavior involves two distinct processes: initiation time and reach curvature. This study confirms these processes are dissociable, with initiation times reflecting threshold adjustments and curvatures reflecting controlled selection, even when controlling for confounds.

Keywords:
Associative primingCognitive controlCongruency sequence effectDecision making

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Motor Control

Background:

  • Reaching behavior components, initiation time and reach curvature, show differing trial sequence effects in congruency tasks.
  • These patterns were hypothesized to reflect distinct decision-making processes: threshold adjustment (initiation time) and controlled selection (reach curvature).
  • Prior studies lacked control for associative-priming confounds, leaving the interpretation of these patterns ambiguous.

Purpose of the Study:

  • To investigate the dissociable processes underlying decision behavior in reaching tasks.
  • To clarify whether initiation times and reach curvatures reflect distinct processes or are influenced by associative-priming confounds.
  • To provide robust evidence for two dissociable processes in conflict-driven decision-making.

Main Methods:

  • A reach-tracking Stroop task was administered to 45 adult participants.
  • Trials were designed to be either confound-minimized or confound-laden to isolate associative-priming effects.
  • Analysis focused on initiation times and reach curvatures in response to congruency manipulations.

Main Results:

  • Initiation times showed main effects of congruency regardless of confounding, supporting their role in threshold adjustment.
  • Reach curvatures were sensitive to associative-priming effects on confound-laden trials but not confound-minimized trials.
  • This dissociation suggests reach curvatures reflect controlled selection processes.

Conclusions:

  • Initiation times and reach curvatures represent dissociable processes in decision-making during conflict tasks.
  • Initiation times are linked to threshold adjustment, while reach curvatures are linked to controlled selection.
  • This study provides strong evidence for two distinct, fundamental processes structuring decision behavior under conflict.