Fig. 1.

Collision data from subject F17. Each graph shows changes in E-values as a function of C–T interval and represents data obtained from a single site. Graphs show AP curves (open squares, dashed lines), PA curves (filled squares, solid lines), or their average (filled triangles, solid lines). Theasterisk or cross next to the site number indicates symmetry or asymmetry between AP and PA curves, respectively. Data points represent the mean ± SEM. The two numbers in the upper left corner of each graph indicate the current intensities (in μA) used for the anterior and posterior electrodes, respectively. The VTA (left) and PM (right) electrode tip locations were reconstructed onto tracings of the Paxinos and Watson (1986) atlas of the rat brain. Numbers above each tracingindicate distance (mm) from bregma. Filled squares indicate sites that did not support SS, and filled circles show the locations of sites that did support SS. scp, Superior cerebellar peduncle; ml, medial lemniscus; MP, medial posterior mammillary nucleus; CG, central gray;DR, dorsal raphe; VTg, ventral tegmental nucleus.