Concurrent Cortical Representations of Function- and Size-Related Object Affordances: An fMRI Study

Area of Science:

• Neuroscience
• Cognitive Psychology
• Motor Control

Background:

• Object perception can automatically prime actions related to an object's features, such as size and function.
• These object affordances may influence immediate grasping and long-term functional use.

Purpose of the Study:

• To investigate the neural mechanisms underlying concurrently potentiated function- and size-related object affordances.
• To differentiate the brain regions involved in processing these distinct aspects of object interaction.

Main Methods:

• Participants performed a reaction-time task involving large and small objects while in a magnetic resonance imaging (MR) scanner.
• Behavioral data (response times) and neural activity were recorded during passive viewing and directed responses.

Main Results:

• Response times were faster when the directional cue aligned with the object's functional end and when using a hand-held switch congruent in size to the perceived object.
• Functional affordances were primarily represented in the posterior parietal cortex.
• Size-related affordances were localized to the prefrontal, premotor, and primary sensorimotor cortices.

Conclusions:

• Distinct brain areas represent function- and size-related object affordances.
• Object features automatically potentiate specific, distinct aspects of object-directed actions.