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Figure 1


Fig. 1. Relative positions of the animal and equipment during experiments and block diagram of data acquisition during echolocation trials. T, target; H, hydrophone; S, hoop station; E, electrodes; EEGamp, EEG amplifier; A/D+Aver, analog-to-digital converter and averager; Store, data storage; Sound-amp+Trig, sound amplifier and trigger; and Scope, monitoring oscilloscope. Distance from target to the animal's ears (*), 2.0 m; distance to the expected sound-production region, 1.9 m; distance to the triggering hydrophone, 1 m.





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