COMMON CODING BY PIGEONS IN A MANY-TO-ONE DELAYED MATCHING TASK AS EVIDENCED BY FACILITATION AND INTERFERENCE EFFECTS

Pigeons were first trained on many-to-one delayed matching in which pa irs of hue and line-orientation samples were associated with individua l comparison stimuli. They were then trained to match two of the origi nal samples (either hues or line orientations) to new comparisons, aft er which 2-sec delays were inserted between the samples and comparison s. In testing, the remaining samples were presented as interpolated st imuli during the delays. When the interpolated stimulus had been assoc iated with the same comparison as the sample in many-to-one matching, performance was significantly more accurate than when it had been asso ciated with a different comparison. This finding adds to the evidence that samples sharing common comparison associations are commonly coded .