Hostname: page-component-848d4c4894-8kt4b Total loading time: 0 Render date: 2024-06-23T15:26:04.746Z Has data issue: false hasContentIssue false

A schizophrenic subgroup: type A5

Published online by Cambridge University Press:  09 July 2009

Iwao Kadobayashi*
Affiliation:
Department of Psychiatry, Kyoto Prefectural University of Medicine, Kyoto, Japan
Hiroshi Haga
Affiliation:
Department of Psychiatry, Kyoto Prefectural University of Medicine, Kyoto, Japan
Yoshihisa Fukui
Affiliation:
Department of Psychiatry, Kyoto Prefectural University of Medicine, Kyoto, Japan
Nobukatsu Kato
Affiliation:
Department of Psychiatry, Kyoto Prefectural University of Medicine, Kyoto, Japan
*
1Address for correspondence: Iwao Kadobayashi, Department of Psychiatry, Kyoto Prefectural University of Medicine, Kawaramachi-hirokoji, Kamigyo-ku, Kyoto, Japan.

Synopsis

This report concerns a group of schizophrenics whose visual evoked potential reduced in amplitude most markedly in A5 (averaged potential evoked by 1 Hz flashes which started 5 min after the addition test for 15 min). These patients in general had poor productive symptoms and progressed very slowly. Most of them were simple schizophrenics.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1980

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bleuler, E. (1911). Dementia Praecox oder Gruppe der Schizophrenien. Franz Deuticke: Leipzig.Google Scholar
Cigánek, L. (1961). The EEG response (evoked potential) to light stimulus in man. Electroencephalography and Clinical Neurophysiology 13, 165172.CrossRefGoogle ScholarPubMed
Creel, D. J., Dustman, R. E. & Beck, E. C. (1973). Visually evoked responses in the rat, guinea pig, cat, monkey, and man. Experimental Neurology 40, 351366.CrossRefGoogle ScholarPubMed
Domino, E. F., Corssen, G. & Sweet, R. B. (1963). Effects of various general anesthetics on the visually evoked response in man. Anaesthesia and Analgesia: Current Researches 42, 735747.CrossRefGoogle Scholar
Hoch, P. & Polantin, P. (1949). Pseudoneurotic forms of schizophrenia. Psychiatric Quarterly 23, 248276.CrossRefGoogle ScholarPubMed
Kadobayashi, I., Toyoshima, A. & Kato, N. (1975). Visual evoked potentials before and after Kraepelin performance test in schizophrenia. Psychophysiology 12, 187191.CrossRefGoogle ScholarPubMed
Kadobayashi, I., Mikami, M. & Kato, N. (1976). Inhibition and enhancement of photically evoked responses by different doses of L-DOPA. Experientia 32, 343345.CrossRefGoogle ScholarPubMed
Kadobayashi, I., Nakamura, M. & Kato, N. (1977). Changes in visual evoked potentials of schizophrenics after addition test. Electroencephalography and Clinical Neurophysiology 43, 837845.CrossRefGoogle ScholarPubMed
Kadobayashi, I., Mori, M., Arima, S. & Kato, N. (1978). Visual evoked potential characteristics and subtypes of schizophrenia. Journal of Nervous and Mental Disease 166, 755780.CrossRefGoogle ScholarPubMed
Williams, H. L., Tepas, D. I. & Morlock, H. C. Jr (1962). Evoked responses to clicks and electroencephalographic stages of sleep in man. Science 138, 685686.CrossRefGoogle ScholarPubMed