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Fig. 3. Spiking timing represented as phase of the sinusoidal movement. (A) Data
from the preparation shown in Fig.
2 presented in terms of phase (i.e. a value from 0 to 1 rather
than 0° to 360°). (B,C) Data from other preparations. The colored
vertical bars show the relative amplitude of the extracellular spikes (large
is blue, medium is red, small is black). To the right of each bar are a number
of cycles of a raster plot corresponding to that spike. Each row represents
one movement cycle with the first cycle on top and subsequent cycles displaced
downwards. The small square is the mean spike phase, and the error bars are
the standard deviation of this phase (for the calculation of mean spike phase,
see Materials and methods). Note that in all three preparations the smallest
spike was active through out the entire movement cycle, whereas the medium and
large spikes were generally active only during the release phase; however, the
mean phases do not differ very much between the different size spikes. (D) The
mean vector length, a measure of the degree of clustering of spikes, is
correlated with the mean number of spikes per cycle. The mean vector length is
highest for neurons that fire very few spikes per cycle. An equation with a
single exponential was used to fit the data
(R2=0.718).
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