Table 1.

Neurochemical and behavioral response to treatment

	Beta receptors density	Behavior failures
	in % of control value	(out of 15 trials)
Helpless	122 ± 5	12.3 ± 0.2
Imipramine	98 ± 3 *	3.8 ± 0.2 *
Mianserin	93 ± 4 *	4.2 ± 0.3 *
Fluvoxamine	95 ± 2 *	4.8 ± 0.4 *
Behavioral training	101 ± 3 *	3.9 ± 0.6 *

* Significantly different from helpless value, p < 0.0001