Fig. 7.

Discrimination index (D2). Graph shows the discrimination index (± S.E.M.) for acute and chronic treatments, both for short- and long-term memories. Increasing D2 indicates the increasing in time spent on novel object (B), suggesting the improvement of cognitive performance. There are significant differences between the control, 0.5, and 3.0 mg/kg of Δ⁹-THC as compared to 1.5 mg/kg of Δ⁹-THC (*p < 0.05). The D2 for acute treatment is comparable to chronic, applied for short- and long-term memories. *p < 0.05 vs 1.5 mg/kg of Δ⁹-THC