Consider the table below. Pigeons are trained in a symbolic matching-to-sample task in which many different sample stimuli are mapped to two comparisons: given Red (R) or Yellow (Y), pick (→) Vertical (V); given Green (G) or Blue (B), pick Horizontal (H). Then one group of pigeons is trained with everything reversed: given Red or Yellow, pick Horizontal; given Green or Blue, pick Vertical. The other group is given a partial reversal: given Red or Green, pick Horizontal; given Yellow or Blue, pick Vertical. Given what you know about “common coding” or mediated generalization, which reversal should be learned more easily? Why?
Training
Reversal
All groups
R→V
Y→V
G→H
B→H
Whole
R→H
Y→H
G→V
B→V
Partial
R→H
Y→V
G→H
B→V
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