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Titolo:
Luminance flicker sensitivity in positive- and negative-symptom schizophrenia
Autore:
Slaghuis, WL; Bishop, AM;
Indirizzi:
Univ Tasmania, Dept Psychol, Hobart, Tas 7001, Australia Univ Tasmania Hobart Tas Australia 7001 chol, Hobart, Tas 7001, Australia
Titolo Testata:
EXPERIMENTAL BRAIN RESEARCH
fascicolo: 1, volume: 138, anno: 2001,
pagine: 88 - 99
SICI:
0014-4819(200105)138:1<88:LFSIPA>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
BACKWARD-MASKING; EYE-TRACKING; CONTRAST SENSITIVITY; VISUAL CHANNELS; TRANSIENT; DEFICITS; MOTION; LESIONS; VISION; VULNERABILITY;
Keywords:
schizophrenia; visual flicker sensitivity; positive symptoms; negative symptoms; magnocellular and parvocellular channel; human;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
100
Recensione:
Indirizzi per estratti:
Indirizzo: Slaghuis, WL Univ Tasmania, Dept Psychol, GPO Box 252-30, Hobart, Tas 7001, Australia Univ Tasmania GPO Box 252-30 Hobart Tas Australia 7001 tralia
Citazione:
W.L. Slaghuis e A.M. Bishop, "Luminance flicker sensitivity in positive- and negative-symptom schizophrenia", EXP BRAIN R, 138(1), 2001, pp. 88-99

Abstract

The aim of the present research was to investigate magnocellular and parvocellular channel disorders using luminance-flicker sensitivity in normal observers and a group with schizophrenia. The threshold sensitivity for a sine wave-modulated patch of achromatic flickering light in a gaussian envelope was measured as a function of its temporal frequency (1.0 Hz, 4.0 Hz, 8.0Hz, 16.0 Hz, 32.0 Hz) and three space average luminance levels (mesopic 3.0 cd/m(2), photopic 33.0 cd/m(2) and 66.0 cd/m(2)). The Andreasen scales for the assessment of positive and negative symptoms in schizophrenia were used to classify subjects into subgroups with predominantly positive and negative symptoms. The results showed that there were no significant differences between the control and positive-symptom group in flicker sensitivity as a function of temporal frequency and luminance level, and there were no differences in flicker sensitivity between the three groups at 1.0 Hz at each of the three luminance levels. At 3.0 cd/m2 the negative-symptom group showed significant reductions in flicker sensitivity at 4.0 Hz, 8.0 Hz, 16.0 Hzand 32.0 Hz in comparison with the control and positive-symptom group. At 33.0 cd/m2 the negative-symptom group showed significant reductions in flicker sensitivity at 4.0 Hz and 32.0 Hz, and at 66.0 cd/m2 they showed significant reductions in flicker sensitivity at 4.0 Hz, 8.0 Hz and 32.0 Hz only in comparison with the control. It was concluded that the non-significant differences in flicker sensitivity in the positive-symptom group showed thatthe processing of temporal information in parvo- and magnocellular channels was unimpaired. Furthermore, the non-significant differences in flicker sensitivity at 1.0 Hz at each of the three luminance levels in the three groups provided evidence that functioning in parvocellular channels was unimpaired in the positive- and negative-symptom group. Finally, it was concludedthat the significant reductions in flicker sensitivity at medium and high temporal frequencies in the negative-symptom group provided evidence for animpairment in magnocellular channels.

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Documento generato il 26/01/20 alle ore 22:15:08