Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Perceptual Disorders”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 127 records · Page 7Linked to original sources
PubMed1984

A five-step procedure for the clinical use of the MPD in neuropsychological assessment of children.

Described a five-step procedure that can be used to detect organicity on the basis of children's performance on the Minnesota Percepto Diagnostic Test (MPD). The first step consists of examining the T score for rotations to determine whether it is below the cut-off score, which has been established empirically as an indicator of organicity. The second step consists of matching the examinee's configuration of error scores, separation of circle-diamond (SpCD), distortion of circle-diamond (DCD), and distortion of dots (DD), with empirically derived tables. The third step consists of considering the T score for rotations and error configuration jointly. The fourth step consists of using empirically established discriminant equations, and the fifth step involves using data from limits testing and other data sources. The clinical and empirical bases for the five-step procedure also are discussed.

Brain Damage, Chronic↗
PubMed1984

Recovery from severe closed head injuries: repeat testings with the Halstead-Reitan Neuropsychological Battery.

Evaluated 15 adult patients who were suffering severe, coma-producing closed head injuries for neuropsychological and intellectual impairment with the Halstead-Reitan Neuropsychological Battery and the Wechsler Adult Intelligence Scale. All Ss were tested shortly after the time of their accidents and were reevaluated at approximately 1 year posttrauma to document residual deficits and rate of recovery. A group of 15 neurologically normal control Ss, matched for age, education, and sex, received the same battery of psychological tests. Although the brain-injured group demonstrated improvement on essentially all of the dependent measures from first testing to second, comparisons made with the control group revealed numerous areas of residual impairment, which suggests only partial recovery during the first year posttrauma.

Adolescent↗
PubMed1986

Confabulation and delusional denial: frontal lobe and lateralized influences.

Various forms of confabulation, including denial of illness (e.g., paralysis, blindness), and conditions that often give rise to these disorders, such as cerebral disconnection, disinhibitory states, incomplete information reception, and "gap filling" are discussed. On the basis of clinical observation and a review of a number of studies, it appears that confabulatory states frequently are associated with cerebral damage that involves the right hemisphere, notably, the frontal (often bilaterally) and parietal lobes--areas intimately involved in arousal, attention, information regulation, and integration. With certain forms of injury, initially there appear disturbances in the organization, integration, and assimilation of ideas and associations, such that large gaps appear in the information transmitted to and received by the language axis of the left hemisphere. It is argued that in these instances, the language areas act so as to fill these "gaps" with information that, although inappropriate, is linked in some manner to the fragments received. In contrast, frontal lobe damage sometimes results in gross disinhibition and cortical overresponsiveness and, thus, speech release due to the flooding of the language axis (and other cortical regions) with tangential, fantastical, and grandiose associations. Other forms of confabulation also are reviewed briefly.

Adult↗
PubMed2004

The cognitive deficits responsible for developmental dyslexia: review of evidence for a selective visual attentional disorder.

There is strong converging evidence suggesting that developmental dyslexia stems from a phonological processing deficit. However, this hypothesis has been challenged by the widely admitted heterogeneity of the dyslexic population, and by several reports of dyslexic individuals with no apparent phonological deficit. In this paper, we discuss the hypothesis that a phonological deficit may not be the only core deficit in developmental dyslexia and critically examine several alternative proposals. To establish that a given cognitive deficit is causally related to dyslexia, at least two conditions need to be fulfilled. First, the hypothesized deficit needs to be associated with developmental dyslexia independently of additional phonological deficits. Second, the hypothesized deficit must predict reading ability, on both empirical and theoretical grounds. While most current hypotheses fail to fulfil these criteria, we argue that the visual attentional deficit hypothesis does. Recent studies providing evidence for the independence of phonological and visual attentional deficits in developmental dyslexia are reviewed together with empirical data showing that phonological and visual attentional processing skills contribute independently to reading performance. A theoretical model of reading is outlined in support of a causal link between a visual attentional disorder and a failure in reading acquisition.

Attention↗
PubMed2004

Specificity of self-concept disturbances in eating disorders.

OBJECTIVES: The current study examined self-concept deficits among three diagnostic groups of eating-disordered patients, evaluated the relationship between self-concept deficits and depression, and addressed the specificity of self-concept deficits in eating-disordered patients. METHOD: Three groups of eating-disordered patients (anorexia nervosa, N = 33; bulimia nervosa, N = 38; binge eating disorder, N = 28) were first compared to three matched healthy control groups and then to two psychiatric comparison groups (patients with anxiety disorders, N = 37; patients with depressive disorders, N = 37). RESULTS: All three groups of eating-disordered patients displayed lower self-esteem and higher feelings of ineffectiveness compared with the healthy controls, even after controlling for depression. Differences in self-esteem and ineffectiveness were also found between eating-disordered patients and psychiatric controls. However, not all of the differences were significant. In addition, the psychiatric controls also exhibited lower self-esteem than normative samples. DISCUSSION: Findings suggest that self-concept deficits are more pronounced in eating-disordered patients but cannot be regarded as highly specific.

Adult↗
PubMed2002

Preterm outcomes research: a critical component of neonatal intensive care.

While early preterm outcome studies described the lives of preterm survivors to justify the efforts required to save them, subsequent studies demonstrated their increased incidence of cerebral palsy, mental retardation, sensory impairments, minor neuromotor dysfunction, language delays, visual-perceptual disorders, learning disability and behavior problems compared to fullterm controls. Because infants born at the lower limit of viability require the most resources and have the highest incidence of neurodevelopmental disability, there is concern that resources have gone primarily to neonatal intensive care and are not available for meeting the followup, health, educational and emotional needs of these fragile infants and their families. Despite many methodological concerns, preterm outcome studies have provided insight into risk factors for and causes of CNS injury in preterm infants. Nevertheless, it remains difficult to predict neurodevelopmental outcome for individual preterm infants. Perinatal and neonatal risk factors are inadequate proxies for neurodevelopmental disability. Recent randomized controlled trials with one to five year neurodevelopmental followup have provided valuable information about perinatal and neonatal treatments. Recognizing adverse longterm neurodevelopmental effects of pharmacological doses of postnatal steroids is a sobering reminder of the need for longterm neurodevelopmental followup in all neonatal randomized controlled trials. Ongoing longterm preterm neurodevelopmental studies, analysis of changes in outcomes over time and among centers, and evaluation of the longterm safety, efficacy and effectiveness of many perinatal and neonatal management strategies and proposed neuroprotective agents are all necessary for further medical and technological advances in neonatal intensive care.

Hospitalization↗
PubMed1998

Kinematics of goal-directed arm movements in neglect: control of hand velocity.

Do patients with unilateral neglect exhibit direction-specific deficits in the control of movement velocity when performing goal-directed arm movements? Five patients with left-sided neglect performed unrestrained three-dimensional pointing movements to visual targets presented at body midline, the left and right hemispace. A group of healthy adults and a group of patients with right-hemispheric brain damage but no neglect served as controls. Pointing was performed under normal room light or in darkness. Time-position data of the hand were recorded with an opto-electronic camera system. We found that compared to healthy controls, movement times were longer in both patient groups due to prolonged acceleration and deceleration phases. Tangential peak hand velocity was lower in both patient groups, but not significantly different from controls. Single peak, bell-shaped velocity profiles of the hand were preserved in all right hemispheric patients and in three out of five neglect patients. Most important, the velocity profiles of neglect patients to leftward targets did not differ significantly from those to targets in the right hemispace. In summary, we found evidence for general bradykinesia in neglect patients, but not for a direction-specific deficit in the control of hand velocity. We conclude that visual neglect induces characteristic changes in exploratory behavior, but not in the kinematics of goal-directed movements to objects in peripersonal space.

Adolescent↗
PubMed1998

Position of the egocentric reference and directional arm movements in right-brain-damaged patients.

We asked 12 right-brain-damaged patients (6 with left neglect signs and 6 without left neglect signs) to perform a straight ahead pointing task and a visual detection task with lateralized motor response, in order to investigate the relationship between the position of the egocentric reference and response time and accuracy in producing lateralized arm movements. Results showed that there was no correlation between the position of the egocentric reference and neglect signs, nor between the position of the egocentric reference and the latencies to direct a motor response toward either side of space. These findings were interpreted within the context of egocentric hypotheses of neglect. In particular, it was suggested that attentional or intentional neglect signs cannot be considered as a direct consequence of an ipsilesional deviation of the egocentric reference.

Adult↗
PubMed1993

Overactivity and boundary setting in anorexia nervosa: an existential perspective.

Excessive motor activity in anorexia nervosa has been variously described as a symptom of a wider perceptual disorder, as the cause of anorexia, and as a neurologically based compulsive behavior. It is also considered a secondary symptom used to burn calories. In this paper, this symptom is considered from an existential perspective. It is first shown that the anorexic's mode of being is overly rational and not irrational as claimed by cognitive-behaviorists. It is then hypothesized that overactivity may help the anorexic person achieve a sense of existential permanence by dynamizing her static and too rational mode of being. It is also advanced that over-activity may play an adaptive role and should not be indiscriminately deterred in the treatment of anorexia nervosa.

Anorexia Nervosa↗
PubMed1982

Psychopatho-ophthalmology, gnostic disorders, and psychosis in cardiac surgery. Visual disturbances after open heart surgery.

The visual disturbances of 45 patients following open heart surgery could be divided into disturbances of (1) visual acuity, (2) visual accuracy, and (3) visual reality testing. The non-hallucinatory phenomena consisted mainly of loss of colour vision, metamorphopsias, visual gnostic disorders and cortical blindness. The hallucinatory phenomena could be divided into the delirium type of hallucinations with clouding of consciousness and the spectator type of hallucinations with a clear sensorium. The causes of the visual symptomatology and cardiac psychoses are seen in microembolization and/or ischemic hypoxia. The basal ganglia and the occipital lobe are areas of predilection for embolic and hypoxic changes. Identical psychoses also occur in cerebral malaria and polycythemia vera which show the same embolic and anoxic neuropathological changes of vascular occlusion as do many patients who die following open heart surgery with extracorporal circulation.

Agnosia↗
PubMed1979

Cognitive abilities and disabilities in infantile autism: a review.

The literature on various aspects of learning and performance in autistic children is reviewed and interpreted as indicating very little that is specific to autism. Inadequate and inconsistent methodology precludes generalizations concerning the nature of the disorder. It is suggested that future research should be particularly concerned with controlling for developmental influences on performance, and with investigation of the higher functioning autistic children who are less governed by retardation factors. The current evidence is considered to support a hypothesis concerning abnormal hemisphere functioning in this group of children.

Autistic Disorder↗
PubMed1977

A diagnostic system for organic brain disorders: critique and suggestion.

Organic brain disorders (OBD) are among the most complex psychiatric diagnostic problems. A critique of the American Psychiatric Association's Diagnostic and Statistical Manual (DSM II) and the proposed DSM III suggests that the diagnostic outline for organic brain disorders contained in these publications (Organic Brain Syndromes in the DSM II; Organic Mental Syndromes in the proposed DSM III) is inadequate to describe the potential range of organic-based behavioral disorders and their possible organic etiologies. A new diagnostic system is proposed, with examples, of its use, which should fit in with the DSM II and the proposed DSM III and be flexible enough to overcome the problems of the present diagnostic system.

Affective Symptoms↗
PubMed1983

Lateralized brain dysfunction in autism: evidence from the Halstead-Reitan neuropsychological battery.

Selected tests from the Halstead-Reitan neuropsychological battery were administered to 10 male individuals who had been diagnosed as autistic in early childhood. Results from the battery obtained from the autistic group were compared with a group of retarded persons matched for IQ and with a group of patients with demonstrable diffuse brain damage. As a group, the autistic subjects showed a pattern of deficits indicative of a significantly greater degree of left hemisphere dysfunction than either comparison group. Furthermore, within-subject comparisons revealed that the autistic group had a significantly greater left than right hemisphere dysfunction, while neither comparison group showed this lateralized pattern.

Adolescent↗