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Even when judging non-numerical features like color, people automatically process number magnitude, showing a small Spatial-Numerical Association of Response Codes (SNARC) effect. Parity processing also occurs automatically, though less strongly than magnitude.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Psycholinguistics

Background:

  • Numbers are processed automatically, even when not task-relevant.
  • The Spatial-Numerical Association of Response Codes (SNARC) effect demonstrates automatic magnitude processing.
  • Previous research on SNARC in non-semantic tasks yielded mixed results, possibly due to underpowered studies.

Purpose of the Study:

  • To investigate the automatic processing of number magnitude and parity in non-semantic tasks.
  • To examine the SNARC effect in color judgment tasks with highly powered experiments.
  • To assess the influence of number magnitude and parity on response strategies.

Main Methods:

  • Two large-scale online experiments were conducted.
  • Participants performed nominal and intensity color judgment tasks on Arabic digits (1-9, excluding 5).
  • Response times were analyzed to detect SNARC, Linguistic Markedness, and odd effects.

Main Results:

  • A small but significant SNARC effect was observed in both color judgment tasks.
  • The size of the SNARC effect did not significantly differ between nominal and intensity judgments.
  • Little evidence for the Linguistic Markedness effect was found, but the odd effect was detected.

Conclusions:

  • Both number magnitude and parity are automatically processed, even when participants focus on non-semantic features.
  • Spatial associations appear more automatic for number magnitude than for parity.
  • Findings suggest robust automatic number processing irrespective of task relevance.