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Fig. 10. Comparison of the behavioral and the neuronal responses to (A) a black
approaching object (B) a black receding object, (C) a white approaching
object, (D) an object moving laterally, and (E) a gradual darkening of the
screen. Behavioral responses are shown as the mean response distances covered
during 10 s following the beginning of the stimulus (left axis). Responses of
M1 and M2 neurons to the same set of stimuli were assessed by counting the
number of elicited spikes during the period of stimulation (right axis). In M2
neurons the spontaneous rate of firing was subtracted from the response. To
obtain the behavioral and the electrophysiological data, crabs were presented
with only one stimulus of each type separated by 3 min. In both behavioral and
electrophysiological experiments the sequence of presentation was varied among
animals. Bars represent mean response scores ± s.e.m. Behavior,
N=14 crabs; neurons: M1, N=11; M2, N=13.
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