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Fig. 2. Summary of responsesto full turn rotation in RS neurons of compensated
UL-animals, tested in light. (Ai,Aii) Number of active neurons as a function
of the roll angle. This value was calculated as the number of neurons
activated in each angular step in each of the animals, and then averaged over
all six animals. (Bi,Bii) Average discharge frequency of neurons as a function
of roll angle. This value was calculated as the number of spikes per second
generated by each neuron in each step and then averaged over all active
neurons in the group (N=31 and 30 for Bi and Bii, respectively). The
0° angle corresponds to the dorsal-side-up orientation of the lamprey. The
angular zones where the ipsilateral (i) or contralateral (co) labyrinth was
facing downward are indicated. Rotation was performed towards the
contralateral labyrinth in turn a, and towards the ipsilateral one in turn b.
Each step of rotation was divided into three intervals, and responses were
calculated separately for each interval (see inset and legend in
Fig. 1). In each of the steps,
the dynamic response (activity during rotation) is shown by a black bar, the
early and late static responses are shown by two successive shaded bars.
Values are means ± S.E.M.
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