Table 1.

Categorization of firing patterns related to the cocaine reinforced lever press

Categories of responsive neurons		Figure example	No. (% neurons)
Postpress change	Reversal
(A) Decrease	Progressive	2a–g,5, 7a–g	20 (50%)
(B) Decrease	Early	3k–l	6 (15%)
(C) Decrease	Late	3o, q	3 (8%)
(D) Increase	Progressive	4s, t, 5, 7s, t	6 (15%)
(E) Increase	Early	4u,7u	2 (5%)
(F) No change	Early	3m	2 (5%)
low pre- and postpress
(G) No change high pre- and postpress	Early	3r,7r	1 (2%)
			40 (100%)

Number of responsive neurons equals 40 (of 78 total neurons).