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Exploring the mental number line: evidence from a dual-task paradigm.
1Department of Psychology, University of Potsdam, 14415 Potsdam-Golm, Germany. danam@rz.uni-potsdam.de
Psychological Research
|June 21, 2006
Summary
The Spatial Numerical Association of Response Codes (SNARC) effect, where smaller numbers are linked to left responses and larger numbers to right, emerges during response selection. This cognitive process occurs regardless of task order or timing.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Human Factors
Background:
- The Spatial Numerical Association of Response Codes (SNARC) effect demonstrates a link between number magnitude and spatial response location.
- Previous research has established the SNARC effect but has not definitively pinpointed the cognitive stage at which it originates.
Purpose of the Study:
- To investigate the specific cognitive stage responsible for the SNARC effect using a dual-task paradigm.
- To determine if the SNARC effect's origin is influenced by task order and stimulus-onset asynchrony (SOA).
Main Methods:
- Employed the psychological refractory period (PRP) paradigm, combining a parity-judgment task with a tone-discrimination task.
- Manipulated the order of tasks (parity-judgment first or second) and the SOA between task stimuli.
- Analyzed SNARC effect magnitudes under different experimental conditions.
Main Results:
- When the parity-judgment task was performed second, SNARC effects were consistent across short and long SOAs, suggesting later-stage processing.
- When the parity-judgment task was performed first, results indicated the SNARC effect arises during earlier stages (perceptual encoding or response selection).
Conclusions:
- The SNARC effect appears to originate during the response selection stage of cognitive processing.
- Task order influences the observed stage of SNARC effect emergence, highlighting the dynamic nature of cognitive architecture.