Perceptual organization deficits in psychotic patients

Psychiatry Research
Emmanuelle R PetersDavid R Hemsley


It has been proposed that a characteristic of schizophrenic processing is an abnormality of top-down processing. The relationship between impaired top-down processing and symptoms of reality distortion was investigated using a 'degraded interference' task. In this task, fragmented stimuli (Stroop words, control words and crosses) are presented on a computer screen, and the extent to which they are visually integrated is inferred by their interfering properties. It was predicted that psychotic individuals would fail to show an interference effect with degraded Stroop stimuli. This predicts the absence of a delay in reaction time in the experimental condition, which therefore cannot be attributed to a generalized deficit. A sample of inpatients experiencing positive symptoms was compared to a healthy control group. The results provided support for a deficiency in top-down processing, with the psychotic group failing to show the significant degraded interference effect found in the healthy controls. Degraded interference was associated with low verbal IQ, but with no other symptomatic or demographic variables.


Oct 1, 1978·The Journal of Nervous and Mental Disease·M D Cox, D Leventhal
Apr 1, 1977·Acta Psychiatrica Scandinavica·M KrawieckaM Vaughan
Jan 1, 1992·European Archives of Psychiatry and Clinical Neuroscience·C H John, David R Hemsley
Feb 1, 1990·Acta Psychiatrica Scandinavica·H J JacksonS D Joshua
Apr 1, 1987·Psychological Review·Irving Biederman
Aug 1, 1987·The British Journal of Psychiatry : the Journal of Mental Science·P F Liddle
May 1, 1984·Journal of Abnormal Psychology·D S Wells, D Leventhal
Jun 1, 1980·Journal of Abnormal Psychology·E J Place, G C Gilmore
Sep 1, 1993·Behaviour Research and Therapy·David R Hemsley
Aug 10, 1999·Journal of the International Neuropsychological Society : JINS·T J FermanC V Jampala
Feb 24, 2001·Journal of Abnormal Psychology·R A KnightM Hershenson
Mar 23, 2001·Journal of Abnormal Psychology·R A Knight, Steven M Silverstein


Mar 27, 2012·Psychological Medicine·E M MarksEmmanuelle R Peters
Aug 3, 2005·Psychological Bulletin·Peter J Uhlhaas, Steven M Silverstein
Mar 31, 2006·Cognitive Neuropsychiatry·Jonathan WilliamsDavid Geaney
Sep 11, 2008·Cognitive Neuropsychiatry·Mathieu BrodeurM Lepage
Jan 29, 2013·Disability and Rehabilitation·Lena Lipskaya-VelikovskyNavah Ratzon
May 22, 2010·Psychiatry Research·M LepageSam Lal
Oct 10, 2007·The Australian and New Zealand Journal of Psychiatry·Carissa M CoulstonChristopher C Tennant

Related Concepts

Sensory Neglect
Schizophreniform Disorders
Reaction Time
Speech Perception

Related Feeds

Auditory Perception

Auditory perception is the ability to receive and interpret information attained by the ears. Here is the latest research on factors and underlying mechanisms that influence auditory perception.