Abstract
1. 1. Sensory sensitivity of skin in European common frog Rana temporaria L. to hydrochloric, citric and acetic acids has been evaluated in analyses of impulse activity in cutaneous nerves and of behavioral reactions of avoidance. 2. 2. According to the electrophysiological and behavioral data, the threshold of skin sensitivity for three acids under study constitutes approximately 0.01 M/1. 3. 3. In behavioral and electrophysiological experiments stimulus efficiency appeared dependent on its concentration in the range of 0.01–0.1 M/l. 4. 4. Efficiency of three acids as stimuli causing reaction of avoidance correlates with the electrophysiological data ( r =0.82, P < 0.01). 5. 5. In general, efficiency of acidic stimuli depends on the character of anions rather than on pH value.
Published Version
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