The Bernstein Center for Computational Neuroscience Freiburg

Announcement for the next
Informal Seminar
Dr. Sébastien Roux
BCCN Freiburg

TEMPORAL ASPECTS OF MOTOR PLANNING: dynamics and interactions of single neurons and LFPs

Wednesday, February 21st, 2007
12:00h (s.t.)
Schänzlestraße Center Court
79104 Freiburg
Neuronal correlates of movement preparation and execution are generally studied by using tasks in which the different steps of the motor plan are triggered by stimuli. However in natural conditions, movements are rarely triggered. Time estimation processes play an important role in motor performance, but only a few studies take this fact in account. To study the influence of time estimation processes in motor cortical activity, we trained monkeys to estimate and discriminate durations in order to perform the required arm reaching movement. Movements were either self initiated or triggered by a signal. We also manipulated the probability of signal occurrence to induce signal expectancy. By using a multi-electrode device, we recorded multiple single-neuron activity and local field potentials (LFP) in primary motor cortex (MI). We found neuronal correlates of time estimation processes in motor cortical activity, such as single neuron activity, precise spike synchronizations and LFP patterns linked to signal expectancy. In general, we found that, for a given movement, neuronal activity is largely influenced by the temporal context of the task.
The talk is open to the public. Guests are cordially invited!