Abstract
A series (450) of preexposures to a tone CS retarded subsequent conditioning of the rabbit’s nictitating membrane response (NMR). Retardation relative to nonpreexposed controls was observed with strong (95 dB) as well as weak (75 dB) tones. A subsequent experiment involving summation tests in which the tone was compounded with an excitatory (light) CS as a function of tone intensity suggested that preexposure resulted in a loss of salience rather than active inhibition.
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