(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.

Fig. 6. Once the negative image is fully developed, it can be long lasting. (A) The
negative image appears after five 30 s coupling tests, and then another five
30 s couplings are given to reinforce the negative image. The negative image
is still apparent after a 2 h rest period without parallel fiber or
electrosensory stimulation, but then fades over 20 min after parallel fiber
stimulus trains alone are resumed. (B) Histograms as in previous figures.