Fig. 3. The probability of a silent fiber (triangles) firing during a prey encounter and the probability of a spontaneously active fiber increasing its discharge rate one (filled circle) or two (open circle) standard deviations above its spontaneous discharge rate during a prey encounter is plotted versus prey distance. If the silent fiber fired during the event, it was considered stimulated, and the probability of the silent fibers firing was calculated as: (stimulated encounters/total encounters)x100. If the firing activity of the spontaneously active fibers firing increased one and/or two standard deviations above its mean resting discharge rate it was considered stimulated and the probability was calculated as: (stimulated encounters >1 S.D./total encounters)x100 and (stimulated encounters >2 S.D./total encounters)x100. The data represent the summary of all trials for each fiber class, and each point represents a minimum of 15 trials at each distance. Prey distance was binned into 2 cm segments.