1. 1.|The effect of localized heating or protocerebrum (bp), the prothoracic (t1), metathoracic (t3) and the sixth abdominal (a6) 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, t3 and t1, a6 was much less so.
3. 3.|In bp and t1 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.
Author Keywords: Temperature sensitivty; insect CNS; Periplaneta americana