MODELLING SNARC BY USING POLARITY CODES TO ADJUST DRIFT RATES

  • Craig Leth-Steensen
  • Joel Lucas
  • Wiliam M. Petrusic

Abstract

Forty participants compared pairs of adjacent positive and negative numbers which were associated with temperature values by using the comparative instructions “Colder?†and “Warmer?â€. In this experiment, the stimulus pairs were presented horizontally and responses were made using left and right manual key presses. The presence of a significant four-way interaction between absolute digit magnitude, digit sign, the form of the comparative instruction, and the side of response provided a very challenging set of constraints for RT modelling. Nonetheless, a good fit to these data could be obtained within a random walk model framework by using adjustments to the drift rates based on both correspondences between polarity codes (Proctor & Cho, 2006) and the nature of the semantic congruency of the pairs with the comparative instructions (Leth-Steensen & Marley, 2000).

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