The visual cortex in schizophrenia: alterations of gyrification rather than cortical thickness--a combined cortical shape analysis

Brain Struct Funct. 2013 Jan;218(1):51-8. doi: 10.1007/s00429-011-0374-1. Epub 2011 Dec 27.

Abstract

In light of bottom-up models of disrupted cognition in schizophrenia, visual processing deficits became a key feature for the pathophysiology of schizophrenia. However, morphometric studies focusing on the visual cortex are limited. Thus, the present study sought to provide a combined cortical shape analysis (cortical thickness, folding) of visual areas, which were implicated to be involved in disturbed visual processing in schizophrenia. A group of 72 patients with schizophrenia according to DSM-IV and 72 age- and gender-matched healthy control subjects were included. All participants underwent high-resolution T1-weighted MRI scans on a 1.5-T scanner. Cortical thickness and mean curvature of the V1, V2 and V5/MT+ visual cortex were estimated using an automated computerized algorithm (Freesurfer Software). A GLM controlling for the effect of age was used to estimate differences of cortical shape parameters between the study groups. Significantly increased gyrification of the V1, V2 and the V5/MT+ visual area bilaterally was detected. Conversely, cortical thickness was reduced in patients with schizophrenia only for the V5/MT+ area. This study is the first providing direct in vivo evidence for a disturbed cortical shape of central visual areas in schizophrenia. The present findings of hypergyria are highly indicative for a disrupted corticogenesis of these visual key regions and might constitute a relevant anatomical basis for visual processing deficits in schizophrenia.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Case-Control Studies
  • Female
  • Humans
  • Magnetic Resonance Imaging
  • Male
  • Psychiatric Status Rating Scales
  • Schizophrenia / pathology*
  • Schizophrenia / physiopathology
  • Schizophrenic Psychology
  • Visual Cortex / pathology*
  • Visual Cortex / physiopathology
  • Visual Perception
  • Young Adult