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Fig. 5. Primary afferent and field potential response patterns to objects of
different conductivity. Top: primary afferent unitary response as a function
of the longitudinal position and conductivity of the object. Two groups of 10
raster diagrams show the latency of a primary afferent unit firing when a
plastic object (left) or a metal object (right) was moved in 5 mm steps along
the fish's body. Position zero indicates the center of the receptive field.
Bottom: the color maps represent the field potential equivalent to the sensory
response (FPSR) as a function of time after the electromotor command
(horizontal axis) and as a function of object position along the fish's body,
relative to the receptive field center (red dot; vertical axis indicated by
the fish body at the left). Results obtained with a plastic cylinder are shown
on the left and with a metal cylinder on the right. The horizontal color bar
shows the basal FPSR in the absence of an object. The vertical color bar
indicates the color code for instantaneous voltage of FPSR record. (Note that
the time scales used in the raster plots and the color maps are
different.)
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