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Fig. 4. Mean phase and mean vector length of small, medium and large spikes. Mean
phase was calculated as the mean of the mean phases from 5 preparations in
which three different sized spikes could be clearly identified as belonging to
individual neurons. For an explanation of the calculation of mean vector
length see Materials and methods. (A) There was no significant difference
between mean phases of small, medium and large spikes. (B) There was a
significant difference between the mean vector length of the small spikes and
the medium spikes, and between small spikes and large spikes. There was no
significant difference between the mean vector length of the medium and large
spikes.