Figure 5. Relationship between age and selected electrophysiological variables. A. P50 T/C ratio generally decreases (ie, sensory gating improves) with advancing age. B. Electroencephalogram (EEG) spectral power in the θ band (4-8 Hz), associated with rapid-eye movement (REM) sleep in the hippocampus, also increases in the same time period.

Reproduced from reference 12: Kisley MA, Olincy A, Robbins E, et al. Sensory gating impairment associated with schizophrenia persists into REM sleep. Psychophysiology. 2003;40:29-38. Copyright © 2003, Blackwell Publishing.