Two studies are reported using rat vocalization to electric shock as the behavioral measure. Study 1 used a classical conditioning procedure with an auditory CS for one group while presenting only the UCS to a second group. The second study investigated the same phenomenon but used a within- instead of a between-groups design. In both studies, Ss given CS-UCS pairings vocalized significantly less to UCS than when the UCS was given alone. Both studies also produced gradual UCR curves but no detectable vocalizations to the CS occurred.
References
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BadiaP.SuterS.LewisP.Rat vocalization to shock with and without a CS. Psychon. Sci., 1966, 4, 111–118.
2.
GriceG. R.Dependence of empirical laws upon the source of experimental variation. Psychol. Bull., 1966, 66, 488–498.
SuterS.LewisP.BadiaP.Rat vocalizations to shock, with and without a CS, with and without illumination. Paper read at Midwestern Psychological Association meetings, 1966, Chicago, Ill.
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