. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. ROBERT GALAMBOS 241 mciit, or both. Docs a diftcrcncc in this complex event ever arise when the stiniukis is changed, say from chck to hghtr Galambos. Again, we do not have the information for answering this question precisely. The evoked response seems to be identical in many brain loci with different stimuli, but in other places this is not so. One of our current problems is to obtain just the data required to answer the question Dr Olds asks. HeknAndez-Peon. I would like to ask two brief questions — 1 n
. Brain mechanisms and learning, a symposium. Psychophysiology; Learning, Psychology of. ROBERT GALAMBOS 241 mciit, or both. Docs a diftcrcncc in this complex event ever arise when the stiniukis is changed, say from chck to hghtr Galambos. Again, we do not have the information for answering this question precisely. The evoked response seems to be identical in many brain loci with different stimuli, but in other places this is not so. One of our current problems is to obtain just the data required to answer the question Dr Olds asks. HeknAndez-Peon. I would like to ask two brief questions — 1 noticed that during anaesthesia there was an enhancement of one of the waves of the auditory cortical potentials. I would like to know what is the interpretation ot this fact. The other question is: where was the puff^ of air applied, because probably its localization is of some importance in conditioning. For example, it it is applied to the eye, the response is probably not extinguished or habituated. But we have observed at the spinal V sensory nucleus that the potential evoked by a puff oi air is decreased with repetition of the stimulus — and the habituation disappears by giving anaesthesia. We also found that the pinna reflex evoked by giving repetitive puffs of air disappears, but if we anaesthetize the cat the pinna reflex returns and is not habituated under anaesthesia. Galambos. I had not considered the possibility that the exact region to which the air puff reinforcement was delivered might make much difference. We have simply blown the air into the animal's face. As to your question ot whether the evoked response amplitude increases with anaesthesia, the answer is a somewhat qualified yes. In the awake animal two electrical events are identifiable in the first 20 or 30 msec, of the cortical response to a click. One of these disappears with anaesthesia. Since the two sum algebraically, removal of one allows the other — the well-known 'evoked response' — to sta
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