Temporal Slowing in the Elderly Revisited

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Abstract
The waking EEGs of 50 healthy elderly (60 years or greater) subjects, without evidence of neurologic or psychiatric disorders, were reviewed. Intermittent temporal slowing was present in 18 (36%). Theta activity (≥1 sec in duration) was present in all 18, while only 6 subjects (12%) also had delta activity which occurred as single or double waveforms. Delta activity did not exceed 0.6% of the recording time. In all subjects but 1, delta and theta activity combined did not exceed 1.8%. Temporal slowing was maximal on the left in 72% of subjects with slowing. Of the various montages employed (longitudinal bipolar, refer-ential-ipsilateral ear, transverse bipolar and referential-vertex), a transverse bipolar montage most often revealed temporal slowing. The alpha frequency of subjects with or without temporal slowing was 9.7 Hz.

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