Table 1.

Mean optical density values ± SEM for trace- and pseudo-conditioned rabbits on the trained and nontrained hemisphere for the barrel hollow and wall of rows A, B, C, and D

	A	B	C	D
Barrel hollow
Trace-conditioned
Trained	56.09 ± 3.34	56.16 ± 3.20	55.67 ± 3.49	54.02 ± 3.12
Nontrained	56.45 ± 6.01	56.58 ± 6.49	56.68 ± 6.23	55.68 ± 6.04
Pseudo-conditioned
Trained	65.06 ± 14.34	61.62 ± 10.97	59.68 ± 10.41	55.43 ± 6.63
Nontrained	51.76 ± 6.79	53.16 ± 6.66	52.84 ± 6.48	54.07 ± 6.47
Barrel wall
Trace-conditioned
Trained	50.41 ± 2.93	50.16 ± 2.70	49.75 ± 2.64	46.76 ± 2.68
Nontrained	49.76 ± 5.18	51.58 ± 5.55	51.16 ± 5.66	49.68 ± 5.40
Pseudo-conditioned
Trained	55.95 ± 12.75	52.58 ± 9.12	51.97 ± 8.28	49.00 ± 6.00
Nontrained	45.59 ± 5.57	47.40 ± 6.20	47.04 ± 5.95	46.84 ± 6.73

Optical density measures for rabbit whisker cortical barrel rows stained with cytochrome oxidase after trace conditioning or pseudo-conditioning.