Stimulus-response compatibility effects during object semantic categorisation: Evocation of grasp affordances or...

Area of Science:

• Cognitive Psychology
• Perception-Action Coupling
• Human-Computer Interaction

Background:

• Size compatibility effects suggest close links between perception and action.
• Existing research is unclear whether these effects stem from abstract size coding or grasp affordances.
• Disentangling these interpretations is crucial for understanding perception-action relationships.

Purpose of the Study:

• To investigate whether size compatibility effects in categorization tasks arise from abstract size coding or grasp affordances.
• To differentiate between conceptual size matching and object manipulability influences on response times.

Main Methods:

• Two groups of young adults categorized small and large natural or artifact objects.
• One group handled manipulable objects; the other handled non-manipulable objects.
• Responses involved grasping a device (power/precision grip) or touching it (large/small touch).

Main Results:

• Compatibility effects were observed in both grasping and control conditions, irrespective of object manipulability or category.
• Participants responded faster when the object's conceptual size matched the response size (power grasps, whole-hand touch).
• Response facilitation occurred even without direct object manipulation, suggesting abstract coding.

Conclusions:

• Findings support the abstract coding hypothesis for size compatibility effects.
• Compatibility between conceptual object size and response size is sufficient to facilitate semantic categorization.
• This highlights the role of abstract representations in bridging perception and action.