Table 1.

Correct choice rates in each trial type at the early and late stages of learning

Correct choice rates in monkey DN
Learning stage N1 N2 N3 R1 R2
Early stagea (8 DA cells) 29.6 ± 15.6 49.7 ± 13.2 75.2 ± 14.1 98.4 ± 2.3 99.5 ± 1.5
Late stageb (44 DA cells) 18.3 ± 5.3 51.5 ± 10.0 89.9 ± 8.6 99.0 ± 2.1 98.3 ± 2.4
Early plus late stages (52 DA cells) 20.0 ± 8.6 51.2 ± 10.4 87.7 ± 10.8 98.9 ± 2.1 98.5 ± 2.3
Correct choice rates in monkey SK
Learning stage N1 N2 N3 R1 R2
Early stagec (19 DA cells) 17.2 ± 4.6 48.1 ± 10.9 76.2 ± 10.1 97.8 ± 4.0 93.9 ± 5.3
Late staged (37 DA cells) 16.8 ± 3.4 48.9 ± 8.4 92.1 ± 8.6 99.1 ± 1.4 99.3 ± 2.0
Early plus late stages (56 DA cells) 16.9 ± 3.8 48.7 ± 9.2 86.7 ± 11.8 98.7 ± 2.6 97.4 ± 4.3
  • Results are expressed as the means ± SD of percentages.

  • a Early stage of learning, days 1-36 of the study.

  • b Late stage of learning, day 37 to month 7.

  • c Early stage of learning, days 1-15 of the study.

  • d Late stage of learning, day 16 to month 3.