Table 1.

Successive Matching Training Contingencies for Groups SL and DL

Hue-Form (AB) Matching	Hue-Hue (AA) Identity	Form-Form (BB) Identity
Group SL
l-R ⟶ l-T - FI 5 s	l-R ⟶ l-R - FI 5 s	l-T ⟶ l-T - FI 5 s
l-R ⟶ l-H - EXT	l-R ⟶ l-G - EXT	l-T ⟶ l-H - EXT
l-G ⟶ l-T - EXT	l-G ⟶ l-R - EXT	l-H ⟶ l-T - EXT
l-G ⟶ l-H - FI 5 s	l-G ⟶ l-G - FI 5 s	l-H ⟶ l-H - FI 5 s
Hue-Form (AB) Matching	Hue-Hue (AA) Identity	Form-Form (BB) Identity
Group DL
c-R ⟶ l-T - FI 5 s	c-R ⟶ l-R - FI 5 s	c-T ⟶ l-T - FI 5 s
c-R ⟶ l-H - EXT	c-R ⟶ l-G - EXT	c-T ⟶ l-H - EXT
c-G ⟶ l-T - EXT	c-G ⟶ l-R - EXT	c-H ⟶ l-T - EXT
c-G ⟶ l-H - FI 5 s	c-G ⟶ l-G - FI 5 s	c-H ⟶ l-H - FI 5 s

Note R = red, G = green, T = triangle, H = horizontal, c = stimulus presented on center key, l = stimulus presented on left key, FI = fixed interval schedule, EXT = nonreinforced. The first stimulus in the trial sequence (the sample) is shown to the left of the arrows, and the second stimulus (the comparison) is shown to the right. Counterbalancing of the hue-form matching contingencies has been omitted.