These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Visual processing deficits in acute and chronic schizophrenics.
    Author: Schwartz BD, Winstead DK.
    Journal: Biol Psychiatry; 1982 Dec; 17(12):1377-87. PubMed ID: 7159637.
    Abstract:
    Psychophysical techniques have been used to assess the duration that brief visual stimuli remain in visual memory. At the earliest "iconic" stage the duration depends on several parameters, one of which is spatial frequency. In the present experiment, a two-pulse temporal resolution task was used to evaluate the duration of iconic persistence in schizophrenics as a function of spatial frequency. Normal controls, acute, and chronic schizophrenics viewed achromatic gratings of different spatial frequencies. Their objective was to discriminate between a single or double flash of these gratings. Signal detection analysis was used to control for psychological factors. Repeated measures analyses of variance revealed that schizophrenics (i) do not conform to the typical relationship between iconic persistence and spatial frequency of the grating and (ii) have longer iconic persistence than normals on all spatial frequencies. The results are discussed in terms of the different sensitivities of transient and sustained neurophysiological mechanisms involved in spatiotemporal frequency visual analysis.
    [Abstract] [Full Text] [Related] [New Search]