Auditory thresholds and cochlear microphonics from the same guinea pigs.
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Animals↗
Biomedical subjects
R A Walloch
Publications and source records attributed to R A Walloch.
Auditory thresholds in the guinea pig: a preliminary report of a behavioral technique employing a food reward.
Guinea pigs have been trained to press a lever for a food reward. Then the behavior was used to obtain the auditory thresholds for six guinea pigs. The thresholds obtained in the present study agree with those previously obtained by Heffner, et al. The most important aspect of the training process was the habituation of the guinea pigs. Once the guinea pig was accustomed to the food and training cage, he could be trained in a manner similar to that used to train many other species.
Animals↗
Cortical evoked potentials recorded from the guinea pig without averaging.
Potentials evoked by tonal pulses and recorded with a monopolar electrode on the pial surface over the auditory cortex of the guinea pig are presented. These potentials are compared with average potentials recorded in previous studies with an electrode on the dura. The potentials recorded by these two techniques have similar waveforms, peak latencies and thresholds. They appear to be generated within the same region of the cerebral cortex. As can be expected, the amplitude of the evoked potentials recorded from the pial surface is larger than that recorded from the dura. Consequently, averaging is not needed to extract the evoked potential once the dura is removed. The thresholds for the evoked cortical potential are similar to behavioral thresholds for the guinea pig at high frequencies; however, evoked potential thresholds are eleveate over behavioral thresholds at low frequencies. The removal of the dura and the direct recording of the evoked potential appears most appropriate for acute experiments. The recording of an evoked potential with dura electrodes empploying averaging procedures appears most appropriate for chronic studies.
Acoustic Stimulation↗