Characterizing and Predicting Drug Effects on Cognition

The investigators' long-term goal is to enhance clinical strategies and inform drug development in order to maximize the benefits of individual drug therapy while minimizing adverse cognitive/language-related side effects. The investigators' objective in this application is to elucidate the relationship among drug exposure as measured by plasma drug levels, its neurophysiological effects, and consequent effects on the cognitive processes observable in everyday language use. Using topiramate (TPM) as a prototype, the investigators will apply the tools of clinical pharmacology, computational linguistics, neuroscience, and engineering to the design and execution of randomized, double blind, crossover studies using three (3) doses of TPM, one (1) dose of a comparator drug (lorazepam-LZP) and a placebo. In order to isolate the cognitive effects of TPM from those possibly arising from an underlying medical condition, subjects will be healthy adults. The investigators will capitalize on an innovative system for automated language and speech analysis (SALSA) developed in our laboratory, to quantify the effects of TPM administration on effective language use, a crucial component of normal day-to-day functioning.

Inclusion criteria

• Healthy men and women
• Ages 18-50
• Women are post-menopausal or using approved birth control methods
• To control for brain lateralization of language functions, subjects need to have a dominant right hand.

Exclusion criteria

• Presence of clinically significant cardiovascular, endocrine, hematopoietic, hepatic, renal, neurologic, and/or psychiatric disease including suicidality
• Vision or hearing impairments
• Current or a history of drug or alcohol abuse
• living outside of the Twin Cities Metropolitan area.
• The use of concomitant medications known to affect Topiramate (TPM), Lorazepam (LZP), or the use of any concomitant medications that may alter cognitive function
• Prior adverse reaction or prior hypersensitivity to TPM, LZP or related compounds
• A positive pregnancy test (administered to all women before enrollment, and prior to each study session).
• Subjects who have received any investigational drug within the previous 30 days