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The Spatial Numerical Association of Response Codes (SNARC) effect shows number-space links. This study found vertical and horizontal spatial representations influence SNARC, but less so in a midsagittal plane, highlighting motor response importance.

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Human-computer interaction

Background:

  • The Spatial Numerical Association of Response Codes (SNARC) effect demonstrates a robust link between numerical magnitude and spatial representation.
  • Previous research suggests that ad hoc spatial representations can be influenced by stimulus and response effector attributes.

Purpose of the Study:

  • To investigate the flexibility of the SNARC effect across different spatial dimensions (horizontal, vertical, and midsagittal).
  • To examine the role of motor response spatialization in eliciting SNARC effects.
  • To determine the dominance of different spatial axes in number-space associations.

Main Methods:

  • Two Go/NoGo experiments were conducted using digit stimuli presented at varying spatial locations.
  • Experiment 1 involved stimuli in horizontal and vertical planes.
  • Experiment 2 involved stimuli in horizontal and midsagittal (close/far) planes, requiring central responses.

Main Results:

  • Experiment 1 yielded significant SNARC effects for both horizontal and vertical dimensions.
  • Experiment 2 showed a significant effect only for the midsagittal axis, and it was barely significant.
  • These results suggest that the spatialization of motor responses plays a crucial role in the SNARC effect.

Conclusions:

  • The spatial component of motor responses is critical for eliciting SNARC effects.
  • When the spatial component of the motor response is removed, the vertical axis shows dominance over the horizontal axis in number-space associations.