Shape constancy in schizophrenic patients.

Shape constancy in visual perception of schizophrenic patients was studied. 40 chronic schizophrenic, 40 acute schizophrenic, 40 nonschizophrenic mental patients, and 40 normal controls were used as Ss. Ss matched the shape of a standard object (circle) inclined at an angle. 2 angles of inclination, 30° and 60°, were used. It was found that shape constancy was lower in schizophrenic patients than in controls when the stimulus object was inclined 60° from the horizontal plane. When the angle of inclination was 30° there was no difference between the groups. The chronic schizophrenic patients displayed greater response variability than the other groups. The relation of these findings to the theory of assimilation of percepts to the perceptual schemata in schizophrenic patients was discussed. (23 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Contextual constraint and schizophrenic language.

Compared 16 hospitalized schizophrenic patients and 16 nonpsychiatric patients for the degree of facilitation of contextual constraint in memory. Ss were matched for intelligence, age, education, duration of illness, and socioeconomic level. All Ss listened to 4 taped word passages of different linguistic structure: normal and anomalous sentences, and semantically related and random word-strings. Ss differed in recall on all conditions, with the greatest difference between S groups occurring on normal sentences. Both S groups showed greater recall on passages emphasizing semantic components than on those with syntactic. Results suggest that the schizophrenic difficulty in communication may be influenced by lack of memory facilitation due to contextual constraints. (24 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Physiological concomitants of behavioral indexes in schizophrenia.

Obtained measures of heart rate, respiration rate, GSR, and EMG from 28 schizophrenic patients and 14 controls under rest and stress conditions. Patients had been classified as either chronic or acute on the basis of the Phillips Premorbid Rating Scale. Depending on the measure, chronic schizophrenic patients were either overaroused or underaroused as compared to control Ss, and acute schizophrenic patients fell in between chronic schizophrenics and controls. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Test-taking sets and the performance of schizophrenics on laboratory tests.

Administered an abbreviated MMPI, a word association test, and a reaction time test under 2 test conditions (neutral and mental illness) to 3 schizophrenic groups-28 acute and 28 chronic Ss from open wards, and 28 chronic Ss from closed wards. Chronic Ss from open wards were the only group to perform differentially on the tests under the 2 conditions, presenting themselves as "healthier" on the MMPI and giving more common responses on the word association test in the mental illness than in the neutral condition. It is concluded that schizophrenic patients likely to be included in research may perform differently on tests given under different conditions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Perceptual styles and their correlates among schizophrenic patients.

Replicated the experimental procedures on which a tridimensional model of schizophrenic perceptual functioning was based, other potentially relevant procedures included, and the resultant relationships delineated and tested through multivariate statistical techniques. Factor analysis supported the existence of the 3 dimensions of the original model stimulus intensity control, scanning control, and field articulation. Through cluster analysis there emerged groups of Ss whose differing perceptual styles paralleled the previously reported pattern of differences between paranoid and nonparanoid schizophrenics. Other results made several major qualifications of the original theory necessary: (1) perceptual inefficiency and anchoring emerge as additional meaningful dimensions of perceptual functioning; (2) behavioral guardedness replaces coherent paranoid delusions as a significant correlate of scanning; and (3) stimulus augmentation is related to strong internal affect only among acute patients; among chronic patients the relationship is reversed. (30 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Scheme and schema in children's memory of their own drawings.

4 groups of 78 6-yr-old children made drawings of 6 themes. One month later new drawings of the same themes were made by the same Ss under 4 conditions: free drawing, memory of the 1st drawing, making a copy of the 1st drawing, making a drawing that appeared different from the 1st one. A week later the Ss were tested for recognition of their own drawings and identification as to when they had been drawn. Recognition of 2nd-session drawings was about equal among the 4 conditions, even though order identification varied significantly and adults found perceptual matches of drawings from the same S much easier with the copy than with the different condition. Results support Piaget's scheme-schema memory distinction in that a basic operative scheme lies behind alternative figural representations. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Constancy of absolute judgments of size by normals and schizophrenics.

A study of size constancy in absolute judgments of chronic schizophrenics and normals under conditions of minimal distance cues showed a significant and consistent underestimation by schizophrenic Ss. The apparently inconsistent results from other studies of size and temporal constancy in schizophrenics were discussed and a hypothesis advanced which related the various findings as a function of loss of reality contact. Schizophrenics in good contact show stable overconstancy. Acutely disturbed schizophrenics show a loss of perceptual stability. Chronic schizophrenics have re-established perceptual stability through autistic frames of reference. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Paired-associate learning by schizophrenic and normal subjects under conditions of personal and impersonal reward and punishment.

This is a report of 2 dissertations done to cross-validate the findings that, contrary to normals, the performance of schizophrenics on various tasks improves under conditions of punishment rather than reward. In addition, these studies tested the effect of personal vs. impersonal conditions of reinforcement. Ss were patients with acute as well as more chronic periods of illness. The results indicate that regardless of whether the reinforcement was administered mechanically (impersonally) or by another individual (personally), the performance of the schizophrenic group again showed improvement under conditions of punishment rather than rewards. The results are related to a theory of the etiology of schizophrenia and to the treatment of schizophrenics. From Psyc Abstracts 36:04:4JQ22A. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Size estimation, perceptual recognition, and cardiac rate response in acute paranoid and nonparanoid schizophrenics.

Studied perceptual response styles of 8 paranoid and 8 nonparanoid schizophrenics in a VA hospital using size estimation and perceptual recognition tasks. Eight alcoholic patients were used as controls. Only acute, actively psychotic, unmedicated schizophrenics were included. Heart rate responses were monitored during the performance of the tasks. Psychological task performance and concomitant physiological responses were analyzed and integrated. The size estimation results replicate earlier findings. During the perceptual recognition task, the paranoid Ss showed a unique "jump to conclusions" response strategy. Early responding and response rigidity was not found to be specific to paranoid schizophrenics. All schizophrenic Ss showed more large-magnitude heart rate response during both tasks. The relationship between perceptual responses and physiological responses differed among the groups. (45 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Perceptual recognition in chronic and acute schizophrenics.

Compared schizophrenic and normal groups on their speed in recognizing the identity of pictorial stimuli which gradually came into sharper focus from an initially blurred appearance. The chronic schizophrenic group (N = 20) showed slower recognition than the acute schizophrenic (N = 20) or normal groups (N = 40), but the groups did not differ in amount of prerecognition hypotheses or time of 1st response. The differences in perceptual recognition speed seem related to certain clinical differences between the acute and chronic schizophrenic, particularly with regard to the impact of external perceptual stimuli vs. internally generated ideation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Rotations of visual designs in psychopathological groups.

Stimuli that systematically varied the figural and spatial orientational information of visual designs were administered under 2 conditions to 4 groups of 15 male Ss each. The groups were composed of normal, process and reactive schizophrenic, and brain-damaged Ss (mean ages-26.3, 42.3, 27.6, and 52.9 yrs, respectively). The stimuli were administered in a recall condition requiring reproduction of stimuli from memory and in a required rotation condition necessitating reproduction in a 90. clockwise rotation. Brain-damaged Ss had a greater tendency than other groups to rotate when a mental rotation was required, but they had a greater tendency to make errors indicating the loss of figural information when reproducing from memory. Process schizophrenics performed much like brain-damaged persons in recall but the same as normals in required rotation, suggesting that discrimination of these groups is possible. Normals produced the most rotations in recall, brain-damaged the least, and schizophrenics an intermediate number. (19 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Level of processing affects priming in word fragment completion.

In 4 experiments, Ss studied words under learning conditions that promoted semantic or physical processing. An implicit word fragment completion test was administered (e.g., complete l ph t for elephant). When semantic and physical study conditions were manipulated between Ss (Exps 1 and 3) or within Ss in a blocked fashion (Exps 3 and 4), significant levels of processing (LOP) effects were obtained. When semantic and physical conditions were presented in a mixed list (Exps 2, 3, and 4), the LOP effect was smaller and not significant. A survey of the literature on LOP effects in implicit perceptual tests revealed that priming in these tests was consistently greater in the semantic than physical condition, with reports of statistically significant LOP effects. These findings contradict the widely held notion that LOP does not affect priming in implicit perceptual tests and have implications for contemporary accounts of performance in implicit and explicit measures of memory. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Level versus pattern of neuropsychological performance among schizophrenic and diffusely brain-damaged patients.

Differences in both mean level and pattern of neuropsychological test performance were examined among groups of carefully screened schizophrenic and acute and chronic diffusely brain-damaged patients (24 Ss in each group). This was done separately for the WAIS subtests and the 12 average impairment rating (AIR) variables derived from the Halstead-Reitan Neuropsychological Test Battery. The schizophrenics performed at a significantly higher level than brain-damaged Ss on both test batteries. Subsequent deficit pattern analyses and coefficients of profile pattern similarity revealed very little difference among the 3 groups in their patterns of performance on the WAIS and AIR batteries. Discriminant function analyses were employed to estimate the diagnostic utility of level vs pattern of performance on the WAIS and AIR in discriminating schizophrenics from brain-damaged Ss. Results suggest that mean level of performance can be used to discriminate clearly defined schizophrenic and diffusely brain-damaged groups, but that pattern analysis offers little additional information. (38 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Parietal lobe syndrome and schizophrenia: Comparison of neuropsychological deficits.

Investigated reported communalities in the perceptual impairments and body image distortions found after parietal lobe lesions and in schizophrenia. To compare these 2 syndromes, 15 patients with lesions of the parietal lobe and 15 patients with schizophrenia were tested on a neuropsychological battery designed to assess deficits in proprioception, tactile functions, and body image experience. Control groups consisted of 15 normal persons and of a series of 15 brain-injured cases in which the parietal lobe had been spared. Results indicate that both schizophrenic and parietally damaged Ss showed significant impairments in weight-discrimination measures of proprioceptive acuity when compared to the control brain-injured and normal Ss. No significant differences among groups were found on a comparable tactile size-estimation task, but the group with parietal injury exhibited a significant deficit in tactile sensory perception on the Finger Agnosia Test. Only the schizophrenic group showed evidence of disturbed body image when reality factors of body dysfunction were taken into account in the brain-injured patients. It is concluded that persons with schizophrenia and parietal lobe damage share a deficit in proprioception that may be based on different neurological substrates leading to (a) tactile impairments in cases with parietal damage, and (b) body-image disturbance in schizophrenia. (24 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Intact text-specific reading skill in amnesia.

Amnesic patients were studied to determine whether the acquisition and retention of item-specific skills can be supported by nondeclarative (implicit) memory. In Exp 1, Ss read 2 different passages 3 times in succession. Reading speed improved at a similar rate in both amnesic patients and normal Ss and was specific to the text that was read. In Exp 2, amnesic patients and normal Ss read a passage 3 successive times and then reread the same passage after a 0-sec, 10-min, 2-hr, or 1-day delay. In both groups, facilitation persisted for at least 10 min and disappeared within 2 hrs. It is suggested that facilitated reading speed depends importantly on both semantic and perceptual information and that such information can be supported by nondeclarative memory. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Effects of biological and social motivation on schizophrenic reaction time.

Reaction times of schizophrenic and normal Ss were determined under instructions to respond as fast as possible to a buzzer signal. Half of the Ss were retested immediately under the same conditions, while the other half were shocked on the responding finger simultaneously with the buzzer. Schizophrenics' RTs improved significantly under shock conditions. Disturbances in schizophrenic RT are "partially accounted for by defective social motivation and… a biological deficit may be involved in the reactions of more chronic schizophrenics." 21 references. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparisons of the restricted association of chronic schizophrenic and normal control subjects.

Obtained 11 types of restricted associations and free associations from 24 chronic schizophrenics and 24 normal controls equated for age and education. The associations of schizophrenics were more variable than those of normal Ss, especially on tasks which most restricted the choice of responses. Agreement in responding between normal and schizophrenic Ss was markedly lower when compared with that between high- and low-creative Ss, or with 1-yr, test-retest data. Repetition of responses given to the same stimuli under different instructions was markedly higher for schizophrenic than normal Ss, and thus the degree of task and response differentiation was reduced. The restricted associations overlapped with free associations more markedly for schizophrenic than for normal Ss, but the general structure of a conceptual semantic space was about the same for both groups. It is argued that when explicit constraint in tasks of verbal associations is high, schizophrenic Ss, more than normals, impose a low degree of implicit constraint on their verbal behavior; when the external constraint is low, they increase their implicit constraint. (26 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Span of apprehension and arousal in schizophrenia.

Investigated the relationship between levels of somatic arousal, autonomic reactivity, and visual information processing in 32 schizophrenic and 16 normal Ss. Span of apprehension for tachistoscopically presented consonants was measured over 80 trials and skin conductance level (SCL) and heart rate (HR) were monitored during rest and performance. An information-processing deficiency in the schizophrenic Ss was interpreted as related to perceptual rather than mnemonic factors. Individual differences in level of arousal (SCL and HR) were not systematically related to information-processing efficiency in schizophrenic or normal Ss. Correlations between span and change in arousal level suggested that autonomic flexibility enhanced information-processing efficiency in both groups. Amplitude of stimulus-specific autonomic reactivity in normal Ss was more specifically modulated to the attention response demands of the task. (28 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Dot Enumeration Perceptual Organization Task (DEPOT): evidence for a short-term visual memory deficit in schizophrenia

The Dot Enumeration Perceptual Organization Task (DEPOT) evaluates the validity of 2 specific competing cognitive models of early input dysfunction in schizophrenic individuals: a primary Stage 1, sensory store, perceptual organization deficit vs. a Stage 2, short-term visual memory (STVM) deficit. DEPOT was also designed to assess the hypothesis that schizophrenic individuals tend to perform poorly on all cognitive tasks. In DEPOT both number and form judgments are made about the same dot patterns. A response delay manipulation assesses the persistence and operation of STVM. The study included 41 psychotic inpatients (8 with acute and 16 with chronic schizophrenia and 7 with bipolar and 10 with nonbipolar affective disorder) and 38 controls (22 college students and 16 hospital personnel). Although the pattern of results was consistent with neither the Stage 1 deficit nor the general deficit hypotheses, a Stage 2, STVM deficit hypothesis could account parsimoniously for the data.     

Evaluation of social problem solving in schizophrenia.

Examined social problem solving in schizophrenia. 27 schizophrenic patients in an acute hospital, 19 patients with bipolar disease, and 17 demographically matched nonpatient controls were tested on an empirically developed problem-solving battery that assessed the ability to generate solutions to problems, the ability to evaluate the effectiveness of solutions, and the ability to implement solutions in a role-playing format. Schizophrenic Ss were impaired on all 3 problem-solving domains compared with the nonpatient controls, but bipolar Ss were equally impaired. Several alternative explanations for these findings were considered. The most compelling hypothesis is that the deficits resulted from different factors: cognitive impairment for schizophrenic Ss and acute illness for bipolar Ss. However, longitudinal studies are required to determine whether problem-solving deficits in schizophrenic patients persist during periods of remission. Implications for rehabilitation strategies are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)