Fig. 5.

Performance on the extradimensional set-shifting task. Nonlinear regression on the cumulative proportion of animals that achieved the criterion over sessions revealed that the HIV-1 Tg and control animals achieved the criterion at the same rate, represented by a single nonlinear regression curve (± 90% CI) (a). There was no significant difference between groups in percent accuracy (5-day average; HIV-1 Tg, 90.1 ± 0.60; Control, 90.2 ± 0.56) (b). The groups were not significantly different in the total number of responses and there was no interaction between group and response type (correct responses or errors) (c).