. Author manuscript; available in PMC: 2015 May 4.

Published in final edited form as: Acta Ethol. 2008 Apr 1;11(1):34–41. doi: 10.1007/s10211-008-0039-0

Table 1.

Comparisons of the number of trials needed and errors made in the acquisition and reversal phases of the discrimination tasks (Wilcoxon signed-ranks test)

Task	Acquisition, median (range)	Reversal, median (range)	T ⁺	p Value
CD (N=11)
Trials	22 (3–40)	50 (22–81)	55	0.001
Errors	7.5 (2–14)	27 (10–45)	55	0.001
FD (N=10)
Trials	41.5 (25–52)	71 (15–85)	42	0.01
Errors	16 (12–25)	40.5 (10–55)	44	0.004
SD (N=10)
Trials	46 (12–90)	47.5 (13–90)	20	NS
Errors	17.5 (4–35)	24.5 (7–36)	34.5	0.102
PosD (N=10)
Trials	4.5 (0–33)	22 (2–44)	39	0.027
Errors	1.5 (0–17)	12.5 (2–24)	44	0.004

N: sample size, CD: color discrimination, FD: form discrimination, SD: size discrimination, PosD: position discrimination, NS: non-significant