Relationship between stimulation level and power output of calls in the amygdala.

<p>A Spectrograms of call sequences produced by stimulating one location in the amygdala at 9 different current levels of between 100 and 500 μA. All the calls were initiated during the 1.6 s long stimulation period (indicated by blue line) and were complete within 100 ms of the end of stimulation. B The total root mean squared power for a window (1.8 s long) covering each call sequence was plotted against stimulation current. The 70μA level was subthreshold and the output power showed a roughly linear relationship to stimulation current when a regression line was fitted to the plot at the higher current levels (dotted line).