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Fig. 6. Response patterns to a metal object located at different distances lateral
to the fish's body. Top: primary afferent unit response as a function of the
rostro-caudal position and lateral distance of the object. Two groups of 10
raster diagrams represent the latency of the spikes of a primary afferent unit
when an object was moved in 5 mm steps rostro-caudally along the fish body, at
distances of 2 mm (left) and 7 mm (right) from the skin. The vertical red
lines indicate the mean latencies of the basal spike discharges in the absence
of an object. Bottom: color maps represent the field potential equivalent to
the sensory response (FPSR) as a function of time and object position as in
Fig. 5, for objects moved
rostro-cadally along the fish's body axis, at lateral distances of 1 mm
(left), 7 mm (middle) and 17 mm (right) from the skin. Object position is
shown relative to the fish picture on the left; the red dot indicates the
receptive field center.
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