Abstract
1. 1.|The effect of localized heating or protocerebrum (bp), the prothoracic (t 1), metathoracic (t 3) and the sixth abdominal (a 6) ganglion on the spontaneous neuronal firing rate in these ganglia was investigated in Periplaneta americana. 2. 2.|In almost every case heating the ganglion increased the firing rate. The most heat sensitive were bp, t 3 and t 1, a 6 was much less so. 3. 3.|In bp and t 1 the firing rate stayed on an increased level even 90 s after the thermal stimulus was over. 4. 4.|The differentiated thermosensitivity of the tested ganglia is discussed in terms of thermoregulatory behaviour of the cockroach.
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