The activity of vertical burst neurons (BNs) was recorded in the rostral interstitial nucleus of ... more The activity of vertical burst neurons (BNs) was recorded in the rostral interstitial nucleus of the medial longitudinal fasciculus (riMLF-BNs) and in the interstitial nucleus of Cajal (NIC-BNs) in head-restrained cats while performing saccades or smooth pursuit. BNs emitted a high-frequency burst of action potentials before and during vertical saccades. On average, these bursts led saccade onset by 14 +/- 4 ms (mean +/- SD, n = 23), and this value was in the range of latencies ( approximately 5-15 ms) of medium-lead burst neurons (MLBNs). All NIC-BNs (n = 15) had a downward preferred direction, whereas riMLF-BNs showed either a downward (n = 3) or an upward (n = 5) preferred direction. We found significant correlations between saccade and burst parameters in all BNs: vertical amplitude was correlated with the number of spikes, maximum vertical velocity with maximum of the spike density, and saccade duration with burst duration. A correlation was also found between instantaneous ver...
1. The activity of thirty-one single motor units (SMUs) was recorded from forearm and hand muscle... more 1. The activity of thirty-one single motor units (SMUs) was recorded from forearm and hand muscles of three volunteers. The excitability of the rhythmically firing motoneurones supplying these SMUs was examined after voluntary discharge using transcranial magnetic stimulation (TMS). 2. The magnetic stimulus was delivered either at a fixed delay (range: 1-60 ms) after SMU discharge (triggered mode) or at random with respect to voluntary SMU discharge (random mode). Post-stimulus time histograms (PSTHs) of responses to 50-100 stimuli were constructed for each experimental condition. 3. In the triggered mode, the probability of response to TMS progressively decreased as the spike-to-stimulus interval was shortened. Shortening of the interval also resulted in redistribution of responses within the different subpeaks characterizing the short-latency response of motor units to TMS: the relative response probability of the first subpeak decreased with the shorter spike-to-stimulus interval...
The activity of vertical burst neurons (BNs) was recorded in the rostral interstitial nucleus of ... more The activity of vertical burst neurons (BNs) was recorded in the rostral interstitial nucleus of the medial longitudinal fasciculus (riMLF-BNs) and in the interstitial nucleus of Cajal (NIC-BNs) in head-restrained cats while performing saccades or smooth pursuit. BNs emitted a high-frequency burst of action potentials before and during vertical saccades. On average, these bursts led saccade onset by 14 +/- 4 ms (mean +/- SD, n = 23), and this value was in the range of latencies ( approximately 5-15 ms) of medium-lead burst neurons (MLBNs). All NIC-BNs (n = 15) had a downward preferred direction, whereas riMLF-BNs showed either a downward (n = 3) or an upward (n = 5) preferred direction. We found significant correlations between saccade and burst parameters in all BNs: vertical amplitude was correlated with the number of spikes, maximum vertical velocity with maximum of the spike density, and saccade duration with burst duration. A correlation was also found between instantaneous ver...
1. The activity of thirty-one single motor units (SMUs) was recorded from forearm and hand muscle... more 1. The activity of thirty-one single motor units (SMUs) was recorded from forearm and hand muscles of three volunteers. The excitability of the rhythmically firing motoneurones supplying these SMUs was examined after voluntary discharge using transcranial magnetic stimulation (TMS). 2. The magnetic stimulus was delivered either at a fixed delay (range: 1-60 ms) after SMU discharge (triggered mode) or at random with respect to voluntary SMU discharge (random mode). Post-stimulus time histograms (PSTHs) of responses to 50-100 stimuli were constructed for each experimental condition. 3. In the triggered mode, the probability of response to TMS progressively decreased as the spike-to-stimulus interval was shortened. Shortening of the interval also resulted in redistribution of responses within the different subpeaks characterizing the short-latency response of motor units to TMS: the relative response probability of the first subpeak decreased with the shorter spike-to-stimulus interval...
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Papers by Etienne OLIVIER