Table 1.

Line- and Hue-Sample Matching Contingencies for Each Group in Experiment 1.

Group
SID	SODD	DFRN
V - DRL 3 s → R+	V - DRL 3 s → R+	V - DRL 3 s → R+
H - FR 20 → G+	H - FR 20 → G+	H - FR 20 → G+
R - drl/fr → R+	R - drl/fr → G+	R - drl/fr → W+
G - drl/fr → G+	G - drl/fr → R+	G - drl/fr → C+

Note. V  =  vertical lines, H  =  horizontal lines, R  =  red, G  =  green, W  =  white, C  =  circle, DRL and drl  =  differential-reinforcement-of-low-rates-of-responding, FR and fr  =  fixed-ratio, (+)  =  reinforced comparison. Sample stimuli and sample–response schedules appear to the left of the arrows; reinforced comparison choices appear to the right of the arrows. Counterbalancing of the DRL 3 s and FR 20 sample-response schedules and the nonreinforced comparisons are not shown. Underlining of “drl” and “fr” indicate the sample-response pattern that should emerge assuming bidirectional transfer. Italics indicate what pattern should emerge via adventitious reinforcement or acquired sample equivalence. SID  =  same comparison alternatives on all trials with identity matching contingences for red and green samples. SODD  =  same comparison alternatives on all trials with oddity contingencies for red and green samples. DFRN  =  different comparison alternatives following vertical and horizontal samples than following red and green samples.