Doctor of Philosophy
William H. Barr
The objective of this investigation was to evaluate quantitative electroencephalography (EEG) as a measure of CNS stimulation. The reproducibility and sensitivity of quantitative EEG was compared to neuroendocrine, mood, and psychomotor performance measures.
The study was conducted in two parts. The ﬁrst part investigated the inter- and intra-individual variability associated with a series of pharmacological response measures under baseline (no drug) conditions. It was an open-label pilot study in which eight healthy male volunteers underwent a series of tests (EEG, visual continuous performance task (CPT), a ﬁnger tapping task, and self-rated mood scales) repeated eight times over a 12 hour period on three occasions, one week apart. The second part evaluated the sensitivity of quantitative EEG to dextroamphetamine (DA) compared to other response measures. It was a double-blind, placebo-controlled, four-period crossover study in eight healthy male volunteers. Subjects received 5 mg, 10 mg, or 20 mg DA or placebo orally, and underwent the same series of tests as well as blood collection for serum prolactin and DA determination, eight times over a 12 hour period. A GC method allowing quantitation of 2ng/mL DA in serum was developed.
The greatest between-day, within-day, and intrasubject variability was associated with quantitative EEG. Learning effects were observed for the psychometric tests, and ﬁrst session effects were apparent for several of the tests including the EEG. EEG response to DA was observed only in the 3 subjects who had baseline alpha activity greater than 35%. There was a statistically signiﬁcant decrease in serum prolactin levels after DA administration, with the largest decrease observed after the 5 mg dose. Mood scales showed that 3 of 9 subjects experienced dysphoria after DA dosing. The effect on mood was generally greater as the dose increased. One subject was discontinued from the study because he experienced intense dysphoria after the 5 mg dose. Doses could not be distinguished based on the results of the psychometric tests. Effects on mood, serum prolactin levels, and performance as measured by CPI and ﬁnger tapping were not correlated with the EEG changes observed. Pharmacokinetic evaluation showed that the rate of DA absorption appears to decrease as the dose increases.
Quantitative EEG conducted under our study conditions and study population was not more sensitive for the assessment of CNS stimulation than the other response measures evaluated. The sensitivity may be improved by screening volunteers to select subjects with higher background alpha activity.
© The Author
Is Part Of
VCU University Archives
Is Part Of
VCU Theses and Dissertations
Date of Submission