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Biomedical subjects

J F Keegan

Publications and source records attributed to J F Keegan.

6 recordsLinked to original sources
PubMed1991

Lateralization of facial processing: a spatial frequency model.

Faces, filtered for either high or low spatial frequency components, were presented tachistoscopically to either the right or left visual fields. The right visual field presentations yielded more errors in a face matching task and this difference was greatest for low spatial frequency stimuli. Left visual field, low spatial frequency stimuli resulted in the fastest reaction times and the lowest error rates. These processing differences may reflect mechanisms underlying a wide range of hemispheric lateralization phenomena.

Adolescent↗
PubMed1984

Relative accuracy of three automated systems for neuropsychological interpretation.

Three computer programs for automated interpretation of variants of the Halstead-Reitan Neuropsychological Test Battery were tested on cases in two data sets. The Key approach of Russell, Neuringer, and Goldstein (1970), Brain I (Finkelstein, 1977), and Adams' (1975) ability-based algorithm were employed in the study. The first data set included 63 well-documented cases with precise criterion data and multiple sources of direct verification. The second data set consisted of 30 equally well-studied cerebrovascular disease patients whose cerebral circulation disorders resulted in clinical manifestations encompassing the entire range of stroke. Results suggested that, while none of the programs do poorly at identifying the presence of brain damage, lateralization and possibly other localization/process predictions are not done well by these programs. The failure described in this particular study does not imply that automated methods are potentially less effective than true actuarial or clinical ones. Rather, we suggest that the translation process from clinical interpretation to the mechanical combinatory logic of the digital computer is at an early stage.

Aged↗
PubMed1979

The MMPI as a predictor of early termination from polydrug abuse treatment.

The MMPI protocols obtained upon admission to an inpatient program for treatment of polydrug abuse were studied to determine if they could identify abusers who terminated prematurely from treatment. Individual scale T scores, profile code types and discriminant scores were evaluated for 104 patients who completed treatment ("stayers") and 72 patients who left prematurely ("quitters"). Although quitters and stayers did not differentiate on primary drug of abuse, age, sex, race, or IQ, quitters were less likely to obtain normal limits or neurotic code profiles, Univariate analyses revealed that quitters obtained higher mean elevations on 6 of the 15 scales studied (F, 4/Pd, 6/Pa, 8/Sc, 9/Ma, A). Discriminant scores based on a stepwise discriminant analysis correctly identified 71% of the study sample, representing a 13.7% improvement over base rate prediction. The probable importance of initial level of psychological discomfort and ability to delay gratification, and the need to examine varied treatment modalities for polydrug abusers identified as at risk for premature termination from treatment were explored.

Adult↗
PubMed1975

Narcotic antagonists: a reasonable method of treating narcotic dependency.

Historically, narcotic dependence has been treated primarily by substituting one narcotic drug for another. One alternative chemical treatment for narcotic dependency is through the use of a narcotic antagonist. The present study involves the observed side effects and outcome results of treating 40 male heroin addicts with the narcotic antagonist, cyclazocine, in the context of a comprehensive psychotherapeutic program. It is concluded that the side effects of cyclazocine are minimal, that cyclazocine is not diverted to the streets, and that it is an effective tool in the context of a comprehensive treatment program for narcotic-dependent individuals.

Aftercare↗