Critical interstimulus interval in delusional schizophrenics and normals.

Saccuzzo, Dennis P.; Miller, Steven P.

doi:10.1037/0021-843x.86.3.261

Cited by 40 publications

(40 citation statements)

References 15 publications

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“…Saccuzzo, Hirt, and Spencer (1974), for example, found that the minimum interval between an informational test stimulus (TS) and a noninfor-Requests for reprints should be sent to Dennis P. Saccuzzo, Psychology Clinic, San Diego State University, San Diego, California 92182. mational backward masking stimulus necessary to achieve unmasked levels of performance easily discriminated schizophrenics from patient and nonpatient controls. Saccuzzo et al's (1974) finding of a masking deficit in schizophrenia has proven to be highly reliable, and it has been replicated in a number of subsequent investigations (Davidson, 1977;Freedman, 1977;Saccuzzo & Miller, 1977). Most recently, Braff and Saccuzzo (in press) replicated the earlier findings of Saccuzzo et al (1974) under rigorous conditions.…”

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confidence: 89%

Backward masking as a measure of slow processing in schizophrenia spectrum disorders.

Saccuzzo¹,

Schubert²

1981

Journal of Abnormal Psychology

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Three groups of hospitalized adolescents (schizophrenics, schizotypal personalities, and borderline personality adolescent adjustment reactions) with 10 subjects in each group were compared for their ability to identify masked and unmasked stimuli. Results revealed that the schizophrenic group required longer minimum exposure durations for criterion identification of unmasked stimuli than the other two groups (p < .01). Under conditions of visual backward masking, however, schizotypal personalities as well as schizophrenics showed a relative deficit. Results supported Heston's notion that schizophrenia spectrum disorders may be different degrees of expression of the same underlying defect. Previous results with visual backward masking in adults were also extended to adolescents. The findings were consistent with a slow information processing hypothesis for schizophrenia spectrum disorders. Theoretical implications of this hypothesis are discussed.

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confidence: 89%

Backward masking as a measure of slow processing in schizophrenia spectrum disorders.

Saccuzzo¹,

Schubert²

1981

Journal of Abnormal Psychology

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“…It was only at longer intervals and when the total display size had to be processed, that schizophrenics and controls differed. In a later study (Saccuzzo & Miller, 1977), a critical inter-stimulus interval was determined by increasing the interstimulus inter-stimulus interval by steps of 2 ms until the letter targets were identified. They found that paranoid schizophrenics required a significantly longer inter-stimulus interval than college students in order to encode enough information off the icon to meet the accuracy criterion.…”

Section: Icon Thresholds In Paranoid and Non-paranoid Sckopluenks Petmentioning

confidence: 99%

“…In effect, the major problem with using a mask technique is that the duration of the icon itself is not solely examined but also the time to encode the icon before another icon appears. Saccuzzo & Miller (1977) have interpreted their work in this manner, 'the larger critical interstimulus interval in schizophrenics indicates that they were slower in encoding from iconic storage than normals' (p.264). That is, the masking procedure is related to speed of encoding rather than the strength of the icon itself.…”

Section: Icon Thresholds In Paranoid and Non-paranoid Sckopluenks Petmentioning

confidence: 99%

Icon thresholds in paranoid and non‐paranoid schizophrenics

Magaro¹,

Page²

1982

British J Clinic Psychol

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Recent work in information processing points to two processes being active when a stimulus produces a short‐term memory trace, the icon. Previous work in schizophrenia seems to have blurred this important distinction and as a result the processing of the icon has been confused with the strength of the icon. The present paper reviews current work with this distinction in mind and presents data on the icon strength of acute paranoid and non‐paranoid schizophrenics, chronic schizophrenics, and two control groups as determined by the method of stimulus exposure time. Results indicate no difference in temporal recognition thresholds between schizophrenics and controls, strongly suggesting that the schizophrenia deficit resides in the encoding process.

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“…This basic experiment has been repeated, with a similar result: schizophrenia patients required much longer ISIs before their performance returned to an unmasked level (for a review, see Braff et al 1991). This deficit may be attentional or represent slowed processing speed characteristic of schizophrenia patients (Braff and Saccuzzo 1985;Saccuzzo and Miller 1977;Sacuzzo et al 1996).…”

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confidence: 99%