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. 2011 Jan;18(1):1–10. doi: 10.1101/lm.1923211

Figure 1.

Figure 1.

Extinction of a stimulus compound reduces spontaneous recovery relative to extinction of a single stimulus. (A) Mean lever presses per stimulus for the initial extinction sessions. (B) Mean lever presses per stimulus on the final extinction session and in the tests conducted 1 and 4 wk later. Presentation of a stimulus compound increased responding during extinction; however, when the element of that compound was tested alone 1 wk or 4 wk later, animals responded less to the stimulus that was extinguished in compound than to the stimulus extinguished alone. Analysis revealed a significant effect of experimental phase indicating that responding was elevated at the 4-wk time point (F(2,22) = 52.3, P < 0.01). Further, while there was no effect of stimulus (F(1,11) = 0.2, P > 0.05), there was a significant interaction between stimulus and phase, indicating that there was greater spontaneous recovery of the stimulus extinguished alone (F(2,22) = 23.6, P < 0.01). *Indicates a significant difference in number of lever presses; P < 0.05; N = 12.