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Unimanual SNARC Effect: Hand Matters.

Marianna Riello¹, Elena Rusconi

¹Laboratories of Functional Neuroimaging, Center for Mind/Brain Sciences, University of Trento Mattarello, Italy.

Frontiers in Psychology

|December 31, 2011

Summary

This summary is machine-generated.

Hand posture influences number processing by creating a directional vector within each hand. This body structural representation interacts with spatial-numerical associations, affecting how we process numbers.

Keywords:

fingers magnitude numbers parity spatial–numerical association of response codes unimanual SNARC

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Area of Science:

Cognitive Psychology
Neuroscience
Human Factors

Background:

Number processing is linked to spatial representations, including the mental number line (MNL).
The spatial-numerical association of response codes (SNARC) effect demonstrates a link between numerical magnitude and spatial location.
Hand finger sequencing during counting may form an allocentric spatial code interacting with numerical tasks.

Purpose of the Study:

To investigate how hand posture (prone vs. supine) affects the spatial-numerical association of response codes (SNARC) effect.
To determine if a posture-invariant body structural representation of finger series influences number processing.
To explore the interaction between within-hand directional vectors and stimulus-response correspondence effects.

Main Methods:

48 Western participants performed magnitude and parity binary judgments using index and middle fingers.
Participants used either the right or left hand in separate blocks.
Hands were tested in either a prone (palm down) or supine (palm up) posture.

Main Results:

A unimanual SNARC effect was observed for the right hand in prone posture.
A unimanual SNARC effect was observed for the left hand in supine posture.
These findings suggest a posture-dependent interaction between hand-based spatial codes and number processing.

Conclusions:

A posture-invariant structural representation of the finger series provides a within-hand directional vector relevant to number processing.
This within-hand vector interacts with stimulus-response correspondence effects like the SNARC.
The study highlights the role of embodied cognition in numerical cognition, extending beyond the traditional left-to-right mental number line.