Figure 4. Magnitude and phase spectra of laser pulse-induced delayed responses.

(a) The mean magnitude curve (the solid red line) shows a sharply tuned peak centered at normalized frequency 1.0. (b) The mean phase curve (the red solid line) indicates that phase decreased with frequency. Data were collected at 15-μJ pulse power from 8 animals. The frequency and magnitude were normalized to the peak frequency and the peak magnitude respectively. The phase curves were shifted vertically to zero at frequency 1.0. SE: standard error.