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Measurement of Spatial Stability in Precision Grip
Published on: June 4, 2020
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Spatial-numerical associations without a motor response? Grip force says 'Yes'.
A Miklashevsky1, M H Fischer1, O Lindemann2
1Potsdam Embodied Cognition Group, University of Potsdam, Germany.
Acta Psychologica
|November 12, 2022
Summary
Spatial-Numerical Associations (SNAs) appear even without explicit motor responses. Grip force changes reveal these associations, with timing and strength varying based on the task demands.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Human Factors
Background:
- The role of Spatial-Numerical Associations (SNAs), like smaller numbers mapping to left space and larger numbers to right space (Mental Number Line hypothesis), is debated.
- Existing research primarily shows SNAs with explicit motor responses, with limited evidence for their occurrence when no response is required.
Purpose of the Study:
- To investigate whether SNAs manifest in passive motor responses (grip force) during number processing without explicit motor tasks.
- To determine if SNAs are present even when participants are instructed not to respond.
Main Methods:
- Recorded passive grip forces during no-go trials in two number processing tasks.
- Experiment 1: Surface numerical decision task (number vs. letter).
- Experiment 2: Semantic task (number > 5 or < 5).
Main Results:
- Spontaneous grip force changes were observed in both experiments, despite instructions to maintain constant force.
- In the numerical decision task, smaller numbers elicited a greater grip force increase in the left hand (500-700 ms post-stimulus).
- In the semantic task, smaller numbers increased left-hand grip force, and larger numbers increased right-hand grip force earlier (180 ms) and for longer (until 580 ms).
Conclusions:
- This study provides the first evidence of SNAs reflected in passive holding grip force.
- Explicit motor responses are not necessary for SNAs to emerge.
- The manifestation of SNAs, including their timing and strength, is dependent on the cognitive task.
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