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Fig. 6. Time course of the effect of Ca²⁺-free saline (A) or 10^–4 mol l^–1 bicuculline (B) on the optical signals in the antennal lobe (AL) evoked by stimulation of the medial nerve (MN). The optical signals were compared in five square areas (mT, cT, lT, mC and lC). The optical signals were filtered at 246 Hz (=F_c). Scale bar in real image, 100 µm. (A) Slow components (arrowheads) were blocked under Ca²⁺-free conditions (green lines). Postsynaptic activities (red lines) were calculated by subtracting the response under Ca²⁺-free saline conditions (green lines) from the response under normal saline conditions (black lines). The excitatory postsynaptic responses (blue lines) were calculated by subtracting each normalized GABAergic optical response from the postsynaptic optical response (red lines). The peak amplitudes of the excitatory postsynaptic responses in the optical signals in the mT, cT and mC were significantly larger than those of the lT and the lC, respectively (see text for details). (B) Bicuculline had no effect on the first peak of the optical signals but increased the second peak of the optical signals (arrowheads on green lines). The possible time course of the GABAergic inhibitory postsynaptic response (orange lines) was calculated by subtracting the responses under bicuculline conditions (green lines) from those under normal conditions (black lines). The maximum amplitudes of the GABAergic inhibitory postsynaptic responses in these MGC sub-regions were not significantly different from each other (double arrowheads).

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