Figure 5.

Relationship between displacement and neural activity at 43 MHz. a, Left, An X-Y slice through the focus (red cross represents point of minimal displacement) at a depth of maximal lateral displacement about midway through the retina that shows lateral displacement vector field in all directions moving away from the focal point. Right, X-Y slice with ultrasound OFF used in a. b, Left, Maximum lateral displacement (in X-Y for a given depth) is plotted versus intensity. +, Data points. Thin line is a linear regression fit (r² = 0.98). Right, Normalized population firing rate (n = 61) is plotted versus intensity and superimposed over displacement versus intensity, where the x axis is now on a log scale. c, Normalized population firing rate is plotted versus displacement from b for each intensity value.