TABLE 2

Effective dose for decreasing response rate by 50% or increasing the percentage of errors by 50% in rats responding under a repeated acquisition and performance procedure

Numbers in parentheses are the 95% confidence intervals for the means.

GroupResp. Rate (A)% Errors (A)Resp. Rate (P)% Errors (P)
Female/saline2.89 (1.16–4.62)1.02 (0.37–1.66)3.31 (1.29–5.33)1.15 (0.47–1.82)
Female/THC3.39 (1.25–5.52)1.28 (0.52–2.04)3.92 (1.81–6.03)1.16 (0.35–1.96)
Male/saline5.57 (2.73–8.41)1.60 (1.07–2.14)5.82 (2.43–9.20)1.86 (0.78–2.95)
Male/THC5.71 (3.38–8.04)2.15 (1.39–2.91)6.17 (3.51–8.84)2.60 (1.20–3.99)