Fig. 2.
CEM neurons are responsive to electrical stimulation of the BL nucleus. A, Scheme showing the position of the stimulating electrode array (dots). B, Graph plotting the peak amplitude of the postsynaptic potentials elicited by stimuli (0.2 msec) of three different intensities (0.2 mA, continuous line; 0.5 mA, dashed line; 1 mA, dotted line) delivered through neighboring stimulating electrodes. The numbers in the x-axis correspond to those marking the stimulation sites in the scheme of A. Four stimuli were delivered at each intensity and stimulation site. Evoked responses were averaged, excluding suprathreshold responses. For clarity, error bars are only indicated for responses evoked by the 1 mA stimuli. C, Examples of evoked responses elicited by stimuli delivered at selected sites (numbers on the left,arrows in B) and at the three stimulation intensities (superimposed single sweeps). The truncated spike in C measured 92 mV. During these tests, the cell was depolarized to −65 mV (0.06 nA). Rest was −86 mV.GP, Globus pallidus; OT, optic tract;PU, putamen; V, ventricle.