Hand position modulates saccadic activity in the frontal eye field

Area of Science:

• Neuroscience
• Oculomotor control
• Motor coordination

Background:

• Eye-hand coordination is crucial for daily tasks.
• The frontal eye field (FEF) plays a role in controlling eye movements.
• Understanding how the brain integrates visual and motor information is key.

Purpose of the Study:

• To investigate if frontal eye field (FEF) saccadic activity is modulated by hand position.
• To explore the role of visual and proprioceptive feedback in this modulation.

Main Methods:

• Recorded single neuron activity in macaque monkeys.
• Monkeys performed visually guided saccades while holding their hand at various touchscreen locations.
• Tasks were performed with and without visual feedback of the hand.

Main Results:

• Saccadic activity of 54% of recorded neurons was dependent on hand position relative to the saccade endpoint.
• Both visual and proprioceptive information from the hand modulated FEF activity.
• This suggests FEF integrates hand position into oculomotor commands.

Conclusions:

• The frontal eye field (FEF) incorporates hand position information into its saccadic activity.
• This integration is achieved through both visual and proprioceptive pathways.
• FEF's oculomotor function is context-dependent, considering the position of the effector limb.