Figure 7.

Direction of lemniscal and cross-laminar propagation. Time lapse images of responses in a transverse slice superimposed on a photograph of the IC (rat, P21) taken through a digital camera on a second port of the microscope. Frame numbers are indicated below each frame. Frames are 0.6 ms apart. (A) Low-gain images show primarily the direction of lemniscal propagation. Inset at bottom: white and gray traces are the summed responses in the corresponding white and gray pixelated areas in the first image (frame 376). Right panel, Expanded image of the first frame, 376, with inset traces of averaged responses in white and gray pixelated areas. The areas picked are used to illustrate different regions of the slice. The region displayed between frames 376 and 415 occur during the region of the response depicted by the red line in the inset. (B) High-gain images of the same time-lapse series show activity in directions that would correspond to cross-frequency connections. The frame sequence is the same as in (A).