Visual field preferences of object analysis for grasping with one hand

Area of Science:

• Neuroscience
• Motor Control
• Visual Perception

Background:

• Motor control of grasping is predominantly guided by the contralateral hemisphere.
• Previous research indicated a left visual field preference for bimanual grasping, suggesting right-hemisphere dominance.
• The role of visual field in unimanual grasping remains unexplored.

Purpose of the Study:

• To investigate visual field influences on unimanual grasping.
• To determine if visual object analysis for grasping relies on contralateral or ipsilateral visual fields.
• To explore hemispheric dominance in unimanual grasp control.

Main Methods:

• Right-handed participants performed precision grasps on objects presented in the left or right visual fields.
• Grasping was performed with either the right or left hand.
• Maximum grip apertures (MGAs) were measured and compared to object width.

Main Results:

• Right-hand grasps showed better performance (closer MGA to object width) for objects in the right visual field.
• Left-hand grasps exhibited a preference for objects in the left visual field.
• Left-hand grasping demonstrated greater visual field differences in MGA scaling compared to right-hand grasping.

Conclusions:

• Visual object analysis for unimanual grasping favors ipsilateral visual field input.
• The left hemisphere demonstrates superior control for unimanual grasps across both visual fields.
• Hemispheric specialization differs between unimanual and bimanual grasping.