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Figure 2


Fig. 2. Cancellation signals are developed after 5 min of continuous coupling of an electrosensory stimulus to ventilatory movements (A), passive fin movements (B) or direct parallel fiber stimulation (C). A raster plot in each case shows the activity of an AEN before, during and after the 5 or 10 min coupling. Note that the red dots on the left indicate trials when the electrosensory stimulus is presented coupled to ventilation, fin movement or parallel fiber stimulation (blue dots). On the right are spike histograms of 30 trials from the times indicated. Boxes on the bottom traces indicate cancellation signals. In each case there is a significant decrease in the AEN subtracted spike rate after the coupling (P<0.01) compared with that before. V, ventilation; V+E, 2 µV local dipole stimulus coupled to ventilatory movements. F, passive fin movement; F+E, 2 µV dipole stimulus coupled to fin movement. PF, parallel fiber electrical stimulation alone; PF+E, 2 µV dipole coupled with parallel fiber stimulus trains. The arrowheads beneath the raster plots indicate the periods of ventilatory movement, fin movement or parallel fiber stimulation. During coupling the E field stimulus is also presented throughout this same stimulus period.





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