Figure 3.

Spontaneous and evoked neural activity is not altered by dehydration. Dehydration does not affect the amplitude (A) and frequency distribution (B) of neocortical electrical activity, whereas isoflurane potently attenuates electrical activity at all frequencies. The field potentials evoked by whisker activation are not affected by dehydration (C). The arrow indicates the application of the stimulus. The amplitude of the negative wave of the field potentials is also not altered by dehydration (D).