Changes in response properties of the cricket giant interneurons during postembryonic development

We investigated the directional sensitivity of four wind-sensitive giant interneurons (GIs), 8-1, 9-1, 9-2 and 9-3, in the fourth-instar nymphs of the cricket Gryllus bimaculatus, using a unidirectional air current stimulus. The directional sensitivity curves expressed with threshold velocities revealed that the preferential directions of GIs in the fourth-instar nymphs were basically the same as those of adults. Intensity-response relations for these GIs in the fourth-, sixth-, last-instar nymphs and adults to air current from front and rear directions were also investigated.