Postural adjustments to head movements in the cat.

Area of Science:

• Neuroscience
• Motor Control
• Animal Physiology

Background:

• Motor cortex stimulation in cats can elicit head movements.
• These movements are associated with changes in limb-based vertical forces.
• Understanding these responses is crucial for motor control research.

Purpose of the Study:

• To investigate the relationship between head movements and postural adjustments in cats.
• To determine if these postural responses are reflex-driven or centrally commanded.
• To elucidate the functional role of these early postural responses.

Main Methods:

• Cats were subjected to motor cortex stimulation to induce head movements.
• Vertical forces exerted by each limb were measured.
• Latencies of force variations, head acceleration, and EMG activity in limb extensors were compared.

Main Results:

• Head dorsiflexions resulted in increased forelimb force and decreased hindlimb force.
• Postural responses were found to be stereotyped.
• The timing of these responses indicated they were not reflex-based.

Conclusions:

• Postural adjustments accompanying head movements are initiated by the same motor command.
• These responses are likely anticipatory, preventing trunk destabilization.
• This finding provides insight into the central control of posture and movement.