Motor control of schizophrenics—II. Manual control and tracking: Sensory and motor deficits

Mather, Jennifer A.; Putchat, Cynthia

doi:10.1016/0022-3956(84)90019-0

Cited by 18 publications

(5 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In accordance with results of other authors, there was no relationship between task performance and dosage of neuroleptic medication [Killian et al, 1984], The finding of a highly significant decrease in task performance of the total group with higher target speed (VTP2 vs. VTP4) is in accordance with the report by Mather and Putchat [1984], Their ratio of hand move ment time to target time increased disproportionally with higher target velocity in schizophrenics compared to normals.…”

Section: Discussionsupporting

confidence: 82%

Visuomotor Tracking Performance in Schizophrenia: Relationship with Psychopathological Subtyping

Gäebel¹,

Ulrich²

1987

Neuropsychobiology

View full text Add to dashboard Cite

30 schizophrenic outpatients (RDC) under neuroleptic maintenance treatment completed a visuomotor tracking task with four degrees of difficulty. The mean efficiency of performance was measured in bit per second from the difference between the target signal and the tracking signal. Clinical assessment was accomplished with the BPRS, CGI, and GAS. Besides generally poorer tracking performance in schizophrenics compared with healthy volunteers the main finding was a relationship between tracking performance and psychopathological subtyping. Negative symptoms were related to a generally lowered task performance, irrespective of task difficulty. However, this effect disappeared by controlling for illness duration. On the other hand, there was a syndrome-specific interaction effect with task difficulty: Schizophrenics with positive symptoms performed poorly, especially in the most difficult task condition. Generally, there was no significant relationship between daily neuroleptic dose and tracking performance. Results are discussed with respect to a differential deficit in attention in schizophrenic subgroups.

show abstract

Section: Discussionsupporting

confidence: 82%

Visuomotor Tracking Performance in Schizophrenia: Relationship with Psychopathological Subtyping

Gäebel¹,

Ulrich²

1987

Neuropsychobiology

View full text Add to dashboard Cite

show abstract

“…A few studies have specifically addressed the intactness of the smooth pursuit system in persons with schizophrenia. Mather and Putchat (1982/1983, 1984) reported pursuit gains in persons with schizophrenia that were similar to those for normal control subjects. Five other investigations, however, have offered evidence that a subset of persons with schizophrenia may have low gain pursuit.…”

Section: Emd As a Biological Marker For Schizophreniamentioning

confidence: 65%

“…The target excursions commonly used by psychopathology researchers studying EMD may confound more specific examination and characterization of eye movements on two accounts. First, the “standard” excursions used by most experimenters are ±10 degrees of visual angle (a few studies have used targets up to ±15 and ±20 degrees of visual angle [Couch & Fox, 1934; Levin et al, 1988; Mather, 1985, 1986; Mather & Putchat, 1982/1983, 1984; Schmid-Burgk, Becker, Diekmann, Jurgens, & Kornhuber, 1982; Whicker et al, 1985; Yee et al, 1987]: These are certainly the exception). Targets usually begin from central fixation and are sinusoidal (approximating the movement of a pendulum in the horizontal plane), although some researchers use triangular wave targets.…”

Section: Stimulus Characteristicsmentioning

confidence: 99%

Is eye movement dysfunction a biological marker for schizophrenia? A methodological review.

Clementz

Sweeney

1990

Psychological Bulletin

170

View full text Add to dashboard Cite

There is a high prevalence of eye movement dysfunction (EMD) in persons with schizophrenia and their first-degree relatives. Studies addressing the prevalence, stability, familial transmission, and psychological correlates of EMD in persons from both psychiatric and general populations offer suggestive evidence that this abnormality may serve as a biological marker for schizophrenia. Although these findings are promising, their significance for elucidating the diagnostic bandwidth, pathophysiology, and genetics of this disorder remains to be determined. More precise characterization of ocular motility, perhaps when used in conjunction with global measures of pursuit adequacy, may be essential for clarifying the pathophysiological and genetic significance of EMD for schizophrenia. Recent research efforts are beginning to identify particular abnormalities that could serve as more specific biological markers for schizophrenia.

show abstract

“…A motoric data limitation is not the only source of poor performance, and a multiple-resource model may be needed (e.g., Navon & Gopher, 1979). Mather and Putchat (1984) studied manual control and tracking in schizophrenic subjects and concluded that both attentional and motor disturbances were involved. We presume that the former are likely to characterize the grip performance of affective subjects, in keeping with Rosofsky, Levin, and Holzman (1982), and when tested in greater numbers, such subjects may prove to be significantly different from normal control subjects.…”

Section: Discussionmentioning

confidence: 99%

Maintenance of grip-induced muscle tension: A behavioral marker of schizophrenia.

Rosen¹,

Lockhart²,

Gants³

et al. 1991

Journal of Abnormal Psychology

View full text Add to dashboard Cite

A grip-induced muscle tension maintenance task distinguished between schizophrenic patients, regardless of medication or hospitalization status, and both normals and controls with affective (unipolar and bipolar) disorders. Unaffected first-degree relatives of schizophrenic patients also showed a grip deficit. Coupling the grip task with a visual discrimination task that divided attention through instruction or reinforcement contingency, increased grip error times for all groups. No group differences appeared on the discrimination task, regardless of difficulty level, and the tone used to provide corrective feedback was not implicated in the grip deficit. The results suggest that the grip task is tapping, in a systematic and reliable manner, a motor-control abnormality that may be useful as a behavioral marker of schizophrenia.

show abstract

Motor control of schizophrenics—II. Manual control and tracking: Sensory and motor deficits

Cited by 18 publications

References 45 publications

Visuomotor Tracking Performance in Schizophrenia: Relationship with Psychopathological Subtyping

Visuomotor Tracking Performance in Schizophrenia: Relationship with Psychopathological Subtyping

Is eye movement dysfunction a biological marker for schizophrenia? A methodological review.

Maintenance of grip-induced muscle tension: A behavioral marker of schizophrenia.

Contact Info

Product

Resources

About