Figure 2: Delay response areas (DRAs) of example neurons.
From: Auditory cortex of newborn bats is prewired for echolocation
Contour plots of response strength are plotted as function of echo delay and echo level. Values for maximum activity (dark red contours) are indicated in spikes per second by orange numbers at the bottom right. Dashed line indicates 50% of maximum activity, white asterisks indicate curve minimum (characteristic delay). Top right: animal age. The call–echo combination is indicated above each plot. (a) Newborn CP: DRAs tuned to 3–12 ms recorded between postnatal days 0–7. (b) Newborn PP: DRAs tuned to 2–10 ms from postnatal days 2–6. (c) For comparison, DRAs from an adult PP are shown; rostro-caudal position is given in μm at the bottom left. In newborn bats, the shape of DRAs is comparable to those of adults although the levels of both call and echo required to obtain responses are higher than in adults.
