Figure 2.

BLA-lesioned (n = 6) animals showed a depotentiation and impairment of LTP under stress conditions compared with sham-operated animals (n = 9; A), whereas under no stress conditions, LTP was facilitated (weak lesion; n = 8) after a weak tetanus compared with controls (weak sham; n = 6; B). No potentiation beyond that elicited by a weak tetanus could be induced by a strong tetanus (strong lesion; n = 6) in lesioned animals (B). The mean and SEM of population-spike amplitudes as percentages from baseline values are shown. Bottom, Representative analog traces at the time points indicated for sham-operated and lesioned animals as well as a scheme of the largest and smallest extent of BLA lesions are shown.