John W. McCrary

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Between the acquisition of Evoked Potential (EP) data and their interpretation lies a major problem: What to measure? An approach to this kind of problem is outlined here in terms of Principal Components Analysis (PCA). An important second theme is that experimental manipulation is important to functional interpretation. It would be desirable to have a(More)
Behavioral markers measured through neuropsychological testing in mild cognitive impairment (MCI) were analyzed and combined in multivariate ways to predict conversion to Alzheimer's disease (AD) in a longitudinal study of 43 MCI patients. The test measures taken at a baseline evaluation were first reduced to underlying components (principal component(More)
An evoked potential component with a poststimulus peak at about 250 milliseconds is related to the storage of information in short-term memory. This storage component was found in an investigation of brain potentials in relation to a number and letter comparison task. In replications of this experiment at three different light intensities spaced 1.0 log(More)
A pattern of components from brain event-related potentials (ERPs) (cognitive non-invasive electrical brain measures) performed well in separating early-stage Alzheimer's disease (AD) subjects from normal-aging control subjects and shows promise for developing a clinical diagnostic for probable AD. A Number-Letter task elicited brain activity related to(More)
An EP component with a poststimulus maximum about 250 msec, labeled the Storage Component, is interpreted to be related to the storage of stimulus information in short-term memory. It was obtained by Principal Components Analysis of Evoked Potentials in a letter/ number information processing experiment. The Storage Component appeared in a similar form in(More)
We analyzed verbal episodic memory learning and recall using the Logical Memory (LM) subtest of the Wechsler Memory Scale-III to determine how gender differences in AD compare to those seen in normal elderly and whether or not these differences impact assessment of AD. We administered the LM to both an AD and a Control group, each comprised of 21 men and 21(More)
By means of video-tape recording the visual presentation of a person's behavior as he carries out some task, can be delayed in such a way that the individual sees what he is doing a short time after he has done it. The effects of this delay of visual feedback on a variety of simple visual-motor tasks are found to be both marked and deleterious, and in some(More)
Behavioral (semantic differential) and neural (Evoked Potentials, EPs) responses were related to connotative meaning. The approach was based on Osgood’s semantic analyses and dimensions of Evaluation (E), Potency (P), and Activity (A). The experimental variables were (I) the semantic class of the stimulus word (E+, E, P+ , P-, A+, A-) and (2) the dimension(More)
s.<lb>Brussels: Presses Universitaires de Bruxelles. Pp. 43-45. (b)<lb>Chapman, R. M. (Chair). 1976. ERPS and language. Transcript of the panel at the Fourth<lb>International Congress on Event Related Slow Potentials of the Brain (EPIC IV),<lb>David A. Otto, Program Chair., Hendersonville, N.C.<lb>Chapman, R. M., & Bragdon, H. R. 1964. Evoked responses to(More)