Neural Correlates of Hand-Object Congruency Effects during Action Planning

Area of Science:

• Neuroscience
• Cognitive Psychology
• Motor Control

Background:

• Object manipulation involves perceptual and goal-driven factors.
• Previous research shows hand-object orientation congruency affects response times.
• Affordances may influence habitual stimulus-response associations.

Purpose of the Study:

• To investigate how hand posture representation during object manipulation planning is affected by hand-object orientation congruency.
• To examine brain activity using fMRI during planning to turn a cup with congruent or incongruent hand orientations.

Main Methods:

• Healthy participants performed reaching and turning tasks with a real cup.
• Cup orientation was either upright or upside-down.
• Participants used congruent or incongruent hand orientations.
• Functional magnetic resonance imaging (fMRI) was used to measure brain activity.

Main Results:

• Motor responses were faster with congruent hand-object orientations.
• Increased brain activity was observed in visual, temporal, parietal, motor, and premotor areas during action planning.
• Dorsal premotor cortex showed specific activation related to congruency during planning.
• Increased activity and connectivity in the dorsal premotor cortex and lateral occipito-temporal cortex occurred during planning of incongruent actions.

Conclusions:

• Hand-object orientation congruency influences motor response speed and neural activity during action planning.
• The dorsal premotor cortex plays a key role in processing hand-object orientation congruency during action planning.
• Increased premotor activity suggests a mechanism for resolving competing hand posture representations when planning incongruent actions.