Cognitive Therapy and Research

, Volume 20, Issue 2, pp 195–208 | Cite as

Attentional processing in schizophrenia: experimental induction of the crossover effect

  • Gerald Rosenbaum
  • Michael J. Taylor


A target group of 16 schizophrenics were compared with 48 college students on both the Rodnick and Shakow (1940) reaction time (RT) paradigm and a dual-task procedure designed to produce the early crossover effect innormals with a balanced order design. The dual-task procedure required subjects to perform a simple version of the continuous perfectionism task (CPT) during all of the preparatory intervals of the classical RT task. Analysis of the RT data showed significantly earlier RT crossover and greater RT slowing across groups on the dual-task procedure. As expected, schizophrenics were significantly slower and had significantly earlier crossover scores across tasks. A planned comparison showed that the experimentally induced early mean crossover of 8.01 sec found in the normal group on the dual-task procedure closely approximated, and was not significantly different from, the mean crossover of 8.36 sec for schizophrenics on the standard task. The increased RTs found in normals on the dual-task procedure never reached the pathological level of overall slowness shown by the schizophrenics. The results are viewed as compatible with both information processing theory and Shakow's (1962) loss of set explanation of schizophrenic attention deficit, and incompatible with Steffy and Galbraith's (1974) redundancy deficit theory. The findings suggest that separate neuropsychological mechanisms of cognitive preparatory attention and a more automatic vigilance form of attention may underlie the regular and irregular RT procedures of the traditional RT task.

Key words

schizophrenia attention information processing crossover reaction time 


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  1. American Psychiatric Association. (1987).Diagnostic and statistical manual of mental disorders (3rd ed., rev.) (DSM-III-R). Washington, DC: Author.Google Scholar
  2. Bellissimo, A., & Steffy, R. A. (1972). Redundancy-associated deficit in schizophrenic reaction time performances.Journal of Abnormal Psychology, 80, 299–307.PubMedGoogle Scholar
  3. Cancro, R., Sutton, S., Kerr, J., & Sugarman, A. A. (1971). Reaction time and prognosis in acute schizophrenia.Journal of Nervous and Mental Disease, 153, 351–359.PubMedGoogle Scholar
  4. Chapin, K. (1982).Incidence of possible marker and symptom variables in schizophrenic, affective, and normal groups. Unpublished doctoral dissertation, Wayne State University.Google Scholar
  5. Chapin, K., Wightman, L., Lycaki, H., Josef, N., & Rosenbaum, G. (1987). Difference in reaction time between subjects with schizotypal and borderline personality disorder.American Journal of Psychiatry, 144, 948–950.PubMedGoogle Scholar
  6. Cromwell, R. L., DeAmicis, L., Hayes, T., & Briggs, D. (1979). Reaction time crossover, a vulnerability index: Mean reaction time, a symptom severity index?Psychopharmacology Bulletin, 15, 24–25.Google Scholar
  7. Davis, J. M. (1974). Dose equivalence of the anti-psychotic drugs.Journal of Psychiatric Research, 11, 65–69.PubMedGoogle Scholar
  8. Galbraith, K. J., MacCrimmon, D. J., & Steffy, R. A. (1983). Preparatory interval effects on redundancy deficit reaction time patterns in schizophrenic and normal subjects using the embedded-set procedure.Journal of Nervous and Mental Disease, 171, 670–675.PubMedGoogle Scholar
  9. Goldstein, P., & Rosenbaum, G. (1982, February).Differential attention mechanisms in temporal lobe vs. generalized seizure disorders. Paper presented at the 10th Annual International Neuropsychological Society Conference, Pittsburgh.Google Scholar
  10. Greiffenstein, M., Milberg, W., Lewis, R., & Rosenbaum, G. (1981). Temporal lobe epilepsy and schizophrenia: Comparison of reaction time deficits.Journal of Abnormal Psychology, 90, 105–112.PubMedGoogle Scholar
  11. Held, J. M., Cromwell, R. L., Frank, E. J., & Fann, W. E. (1970). Effect of phenothiazines on reaction time in schizophrenics.Journal of Psychiatric Research, 7, 209–213.PubMedGoogle Scholar
  12. Huston, P. E., Shakow, D., & Riggs, L. A. (1937). Studies of motor function in schizophrenia: II. Reaction time.Journal of General Psychology, 16, 39–82.Google Scholar
  13. Nuechterlein, K. R. (1977). Reaction time and attention in schizophrenia: A critical evaluation of the data and theories.Schizophrenia Bulletin, 3, 373–428.PubMedGoogle Scholar
  14. Nuechterlein, K. R., & Dawson, M. E. (1984). Informational processing and attentional functioning in the developmental course of schizophrenic disorders.Schizophrenia Bulletin, 10, 160–203.PubMedGoogle Scholar
  15. Posner, M. I. (1982). Cumulative development of attentional theory.American Psychologist, 37, 168–179.Google Scholar
  16. Rodnick, E. R., & Shakow, D. (1940). Set in the schizophrenic as measured by a composite reaction time index.American Journal of Psychiatry, 97, 214–225.Google Scholar
  17. Rosenbaum, G., Shore, D. L., & Chapin, K. (1988). Attention deficit in schizophrenia and schizotypy: Marker versus symptom variables.Journal of Abnormal Psychology, 97, 41–47.PubMedGoogle Scholar
  18. Rosvold, H. E., Mirsky, A. F., Sarason, I., Bransome, E. G., & Beck, L. H. (1956). A continuous performance test of brain damage.Journal of Consulting Psychology, 20, 243–350.Google Scholar
  19. Shakow, D. (1962). Segmental set: A theory of formal psychological deficit in schizophrenia.Archives of General Psychiatry, 6, 1–17.PubMedGoogle Scholar
  20. Steffy, R. A., & Galbraith, K. J. (1974). A comparison of segmental set and inhibitory deficit explanations of the crossover pattern in process schizophrenic reaction time.Journal of Abnormal Psychology, 83, 227–233.PubMedGoogle Scholar
  21. Zubin, J. (1975). Problem of attention in schizophrenia. In M. L. Kietzman, S. Sutton, & J. Zubin (Eds.),Experimental approaches to psychopathology. New York: Academic Press.Google Scholar

Copyright information

© Plenum Publishing Corporation 1996

Authors and Affiliations

  • Gerald Rosenbaum
    • 1
  • Michael J. Taylor
    • 1
  1. 1.SDSU/UCSD Joint Doctoral Program in Clinical PsychologySan Diego

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