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Psychosomatic Medicine 36:156-163 (1974)
© 1974 American Psychosomatic Society
1 Rockefeller University New York, N.Y. 10021; Depto. de Bienestar y Orientación, Correo Universidad de Costa Rica, San José, Costa Rica
2 Rockefeller University New York, N.Y. 10021
Address reprint requests to Dr. N. E. Miller, The Rockefeller University, New York, N.Y. 10021
Male rats with a chronically implanted device that allowed photoelectric plethysmographic measures to be made of the stomach wall were trained while paralyzed with d-tubocurarine and being artificially respirated. One group was reinforced by avoidance of and/or escape from electric shocks to the tail, whenever increases in the transmission of light through the stomach wall occurred during a CS; another group was reinforced for decreases. Reliable changes in the rewarded direction were learned. These results are interpreted as evidence for the instrumental learning of a gastric response which, in the light of control experiments, very probably was a vasomotor one producing changes in the amount of blood in the stomach wall.
Note:
The experimental work on this study was performed during the academic year 1967-68. Its publication was delayed due to the senior author's return to Latin America. During the intervening time there has been an extremely perplexing, and as yet unexplained, progressive decline to virtually zero in the amount of visceral learning shown by rats paralyzed by curare (8, 10, 15).
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