Fig. 2. The adaptation protocol for short-term adaptation. A conditioning stimulus of 10 µg bombykal (BAL) and 250 ms duration was applied 20 s before each test/control stimulus of 50 ms duration. Test stimuli of various BAL doses (measured in log₁₀-units; filled columns) or the control (C; open columns) were applied in increasing order. To avoid accumulative adaptation, stimulus pairs were separated by at least 10 min. The time axis is not drawn to scale. For test stimuli of 1000 ms duration, a similar stimulation protocol was used. The conditioning stimuli were 1000 ms long, however, and applied 60 s before the test stimuli.