To promote the success of clinical trials testing interventions for Alzheimer's disease (AD), it is imperative that researchers establish proper subject enrollment and measure the clinical efficacy of the treatment. Brain Event-Related Potentials (ERPs), which are obtained while subjects do tasks with designed perceptual/cognitive demands, offer a noninvasive method of measuring brain activity affected by AD that, once developed, can be implemented for clinical and research use without special equipment or special expertise. In conjunction with sophisticated multivariate analytic techniques, temporal ERPs have been shown to detect AD and predict AD progression in individuals with pre-clinical form of the disease.
Our aim i s to expand the study of ERPs to incorporate both their temporal and spatial properties in novel and innovative composite measures to: 1) define and refine the AD subject population to improve proper subject enrollment in clinical trials even in predementia AD, and 2) develop measures of brain activity that can detect change in subjects over time in order to gauge the effects of AD treatments. Using a cognitive paradigm known to elicit ERPs representative of memory encoding and retrieval, stimulus expectancy, and executive functioning, we will collect ERPs from AD patients early in the course of the disorder, MCI patients (a sizeable percentage of whom develop AD within a few years), and normal elderly. We will then apply new multivariate techniques, including Two-step Spatiotemporal Principal Components Analysis and Parallel Factors Analysis to define and measure the underlying spatiotemporal components of the ERPs, in order to combine both the temporal waveforms of the ERPs and their spatial distributions into useful composite measures. These spatiotemporal ERP measures will be linearly combined into discriminant functions that can be used to make group assignments with a quantitative measure of confidence in each subject's assignment through posterior probabilities of group membership. This technique will also be studied to detect change over time by reanalyzing group placements longitudinally. If successful, these ERP measures and multivariate methods will provide important tools for improving the validity of clinical trials while addressing the difficult barrie of empirically and quantitatively combining spatial and temporal ERP measures for use in evaluating AD across its course.

Public Health Relevance

Alzheimer's disease (AD), a persistent and devastating dementing disorder of old age, is a major public health burden whose impact is rising dramatically with the burgeoning aging population. This study aims to improve clinical trials testing treatments for AD by developing brain ERP measures as tools to ensure proper subject enrollment in clinical trials and to measure clinical efficacy of the treatment.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Project (R01)
Project #
1R01AG041313-01A1
Application #
8369846
Study Section
Special Emphasis Panel (ZRG1-BBBP-V (55))
Program Officer
Ryan, Laurie M
Project Start
2012-08-15
Project End
2017-07-31
Budget Start
2012-08-15
Budget End
2013-07-31
Support Year
1
Fiscal Year
2012
Total Cost
$316,725
Indirect Cost
$111,725
Name
University of Rochester
Department
Other Basic Sciences
Type
Schools of Arts and Sciences
DUNS #
041294109
City
Rochester
State
NY
Country
United States
Zip Code
14627
Chapman, Robert M; Porsteinsson, Anton P; Gardner, Margaret N et al. (2013) The impact of AD drug treatments on event-related potentials as markers of disease conversion. Curr Alzheimer Res 10:732-41
Chapman, Robert M; Porsteinsson, Anton P; Gardner, Margaret N et al. (2013) C145 as a short-latency electrophysiological index of cognitive compensation in Alzheimer's disease. J Alzheimers Dis 33:55-68