Abstract
In a psychiatric population, cognitive abnormality impacts on intellectual functioning and is often misconstrued as subnormality, i.e., mental retardation. Standard IQ and neuropsychological tests contribute little to the differential diagnosis, which hinges on the question of developmental failure. A developmentally rooted psychometric battery, one that assesses conceptual, perceptual-motor, and social maturity, is proposed as an objective diagnostic method. Research confirms the validity of this approach for distinguishing between psychosis with severe functional vs. developmental impairment, even when matched for IQ. Diagnostic and treatment implications are discussed.
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References
American Psychiatric Association:Diagnostic and Statistical Manual of Mental Disorders. Washington, DC: Author, 1980.
Ammons RB, Ammons CH: The Quick Test: Provisional manual.Psychological Reports, 11:111–161, 1962. (Monogr. Suppl. 1-VII)
Batman RH, Albee GW, Lane EA: Intellectual test performance of chronic and recovered schizophrenics.Proceedings of the 74th Annual Meeting of the American Psychological Association. Washington, DC: American Psychological Association, 1966.
Ben-Yishay Y, Diller L: Cognitive rehabilitation. In M Rosenthal (ed)Rehabilitation of the Head Injured Adult Philadelphia: FA Davis Company, 1983.
Birch HG, Richardson SA, Baird D, Horobin G, Illsley R:Mental Subnormality in the Community: A Clinical and Epidemiological Study. Baltimore: Williams and Wilkins, 1970.
Blatt SJ: Recall and recognition vocabulary: Implications for intellectual deterioration.Archives of General Psychiatry 1:473–476, 1959.
Blatt SJ, Wild CM:Schizophrenia: A Developmental Analysis. New York: Academic Press, 1976.
Carpenter WT Jr, Heinrichs DW, Alphs LD: Treatment of negative symptoms.Schizophrenia Bulletin, 11:440–452, 1985.
Chapman LJ, Chapman JP: The measurement of differential deficit.Journal of Psychiatric Research, 14:303–311, 1978.
Conley RW:The Economics of Mental Retardation. Baltimore: Johns Hopkins University Press, 1973.
Dizzonne MF, Davis WE: Relationship between Quick Test and WAIS IQs for brain-injured and schizophrenic subjects.Psychological Reports, 32:337–338, 1973.
Doll EA:Vineland Social Maturity Scale: Condensed Manual of Directions. Circle Pines, MN: American Guidance Service, 1965.
Friedhoff AJ: A strategy for developing novel drugs for the treatment of schizophrenia.Schizophrenia Bulletin, 9:555–562, 1983.
Garfield SL: Abnormal behavior and mental deficiency. In NR Ellis (ed)Handbook of Mental Deficiency: Psychological Theory and Research New York: McGraw-Hill, 1963.
Graham FK, Kendall BS: Memory-For-Designs Test: Revised general manual.Perceptual and Motor Skills, 11:147–188. (Monogr. Suppl. 2-VII)
Grossman H:Manual on Terminology and Classification in Mental Retardation. Washington, DC: American Association on Mental Deficiency, 1977.
Harris DB:Children's Drawings as Measures of Intellectual Maturity: A Revision and Extension of the Goodenough Draw-A-Man Test. New York: Harcourt, Brace, and World, 1963.
Harrow M, Tucker GJ, Adler D: Concrete and idiosyncratic thinking in acute schizophrenic patients.Archives of General Psychiatry, 26:433–439, 1972a.
Harrow M. Tucker GJ, Himmelhoch J, Putnam N: Schizophrenic “thought disorder” after the acute phase.American Journal of Psychiatry, 128:824–829, 1972b.
Howells JG, Guirguis WR: Childhood schizophrenia twenty years later.Archives of General Psychiatry, 41:123–128, 1984.
Huessy HR: The adult hyperkinetic.American Journal of Psychiatry, 131:724–725, 1974.
Kay SR: Developmental assessment of cognitive style in mentally retarded psychotics.Journal of Clinical Psychology, 33:453–458, 1977.
Kay SR: Qualitative differences in human figure drawings according to schizophrenic subtype.Perceptual and Motor Skills, 47:923–932, 1978.
Kay SR: Progressive figure drawings in the developmental assessment of mentally retarded psychotics.Perceptual and Motor Skills, 50:583–590, 1980.
Kay SR:The Cognitive Diagnostic Battery: Evaluation of Intellectual Disorders. Odessa, FL: Psychological Assessment Resources, 1982a.
Kay SR: Conceptual disorder in schizophrenia as a function of encoding orientation.Journal of Nervous and Mental Disease, 170:154–163, 1982b.
Kay SR: Diagnosis of mental retardation in schizophrenia: Psychometric distinction between intellectual subnormality and abnormality.Journal of Psychoeducational Assessment, 4:13–25, 1986.
Kay SR, Opler LA, Fiszbein A: Significance of positive and negative syndromes in chronic schizophrenia.British Journal of Psychiatry, 149:439–448, 1986.
Kay SR, Singh MM: A temporal measure of attention in schizophrenia and its clinical significance.British Journal of Psychiatry, 125:146–151, 1974.
Payne RW: Cognitive abnormalities. In HJ Eysenck (ed)Handbook of Abnormal Psychology London: Pitman Medical Press, 1973.
Reiss S, Levitan GW, McNally RJ: Emotionally disturbed mentally retarded people: An underserved population.American Psychologist, 37:361–367, 1982.
Seidman LJ: Schizophrenia and brain dysfunction: An integration of recent neurodiagnostic findings.Psychological Bulletin, 94:195–238, 1983.
Sternberg RJ: Testing and cognitive psychology.American Psychologist, 36:1181–1189, 1981.
Taft LT, Belmont I: Treatment strategies. In D Kligler (ed)Developmental Disabilities: Problems and Issues. New York: Rose F. Kennedy Center for Research in Mental Retardation and Human Development, 1974.
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Kay, S.R. Differential diagnosis of mental subnormality and abnormality: The contribution of psychometrics. Psych Quart 59, 47–61 (1988). https://doi.org/10.1007/BF01064292
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DOI: https://doi.org/10.1007/BF01064292