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* To whom correspondence should be addressed. E-mail: trevor.drew{at}umontreal.ca.
We have addressed the nature of the postural control signals contained within the discharge activity of neurones in the pontomedullary reticular formation, including reticulospinal neurones, during a reaching task in the cat. We recorded the activity of 142 neurones during ipsilateral reaching movements that required anticipatory postural adjustments (APAs) in the supporting limbs to maintain equilibrium. Discharge activity in 82/142 (58%) neurones was significantly increased before the onset of the reach. Most of these neurones discharged either in a phasic (22/82), tonic (10/82) or phasic/tonic (41/82) pattern. In each of these 3 groups, the onset of the discharge activity in some neurones was temporally related either to the Go signal or to the onset of the movement. In many neurones, one component of the discharge sequence was better related to the Go signal and another to the onset of the movement. Based on our previous behavioural study during the same task (Schepens and Drew 2003a) we suggest that reticular neurones in which the discharge activity is better related to the Go signal contribute to the initiation of the APAs that precede the movement. Neurones in which the discharge activity is better related to the movement signal might contribute to the initiation of the movement and to the production of the postural responses that accompany that movement. Together our results suggest the existence of neurones that signal posture and movement independently and others that encode a convergent signal that contributes to the control of both posture and movement.
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