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PubMed1993

Cognitive style and perception: the relationship between category width and speech perception, categorization, and discrimination.

Category width, as defined by Pettigrew's (1958) Category Width Scale, is a cognitive variable that purportedly reveals individual differences in categorization strategy. Subjects differ in terms of broadness and narrowness of judgments of category width--to what extent they will accept exemplars as good instances of a category. We tested the hypothesis that category width would be related to how subjects behave in different speech perception tasks. Differences found between extremely broad and narrow categorizers on such tasks would be helpful in understanding the nature of the perceptual and cognitive processes underlying the category width distinction. No effects attributable to category width were found when results were analyzed in terms of subjects' (a) discrimination and feature evaluation of auditory and visual information in speech events, (b) integration of these sources of information, (c) the process of decision, and (d) subjective preference for a two-choice versus a nine-choice response method. The results from both male and female and broad and narrow categorizers supported the predictions made by a fuzzy logical model of perception (FLMP). In the FLMP, people have access to continuous information about each feature of a stimulus, they make independent evaluations of each feature based on this information, the various features are integrated, and a decision is made based on the relative support for the viable alternatives. Given the common processes involved in speech and other pattern perceptual-recognition tasks, we conclude that fundamental processes involved in pattern recognition are unlikely to vary with personality measures, such as category width.

Acoustic Stimulation↗
PubMed2005

Perception of sleep: subjective versus objective sleep parameters in patients with Parkinson's disease in comparison with healthy elderly controls. Sleep perception in Parkinson's disease and controls.

INTRODUCTION: Subjective sleep perception, as measured against objective parameters such as those obtained by polysomnography, have not been examined thoroughly to date. Little is known about subjective sleep perception in patients with chronic somatic diseases. PATIENTS AND METHODS: Patients with Parkinson's disease (PD) and healthy elderly controls filled in a sleep log over 14 days, which included a self-rating questionnaire concerning sleep and quality of time awake, sleep times and somatic complaints. All participants underwent polysomnography in the sleep lab on nights 7 and 8, and slept all other nights at home. RESULTS: Seventeen patients with PD (64 +/- 6 years, 6 female, Hoehn and Yahr median = 2), and 62 healthy controls of the same age without sleep disturbances (64 +/- 8 years, 36 female) were included. Patients with PD showed reduced subjective sleep (p = 0.001) and quality of time awake (p = 0.02), decreased sleep duration (p = 0.01) and reduced sleep efficiency (p = 0.004) compared with the controls. Subjective sleep efficiency at home was no different from that in the sleep lab for both groups. Patients with PD reported more somatic complaints (p = 0.001) than controls but did not show a firstnight effect. CONCLUSION: In summary, patients with PD have subjectively and objectively disturbed sleep as compared to healthy controls of the same age. However, they may not rate this poor sleep as much changed from their baseline sleep at home, and they have more somatic complaints. Increasing sleep efficiency might be of importance in PD patients, as it shows an association with subjective quality of time awake in the morning.

Aged↗
PubMed1986

Vowel perception: a neuroradiological localization of the perception of vowels in the human cortex.

Whether the perception of vowels takes place in the right or left cerebral hemisphere, or is dependent on bilateral cortical processes, is of importance in our treatment of patients with language deficiencies. To investigate this problem a phonetic test with a series of vowellike stimuli was administered to 68 right-handed adult patients with cerebral lesions, mainly of vascular origin. The results were compared to the results in a control group of 19 speech therapists. Second, a neuroradiologic method was developed in order to visualize the anatomic site of Wernicke's area in the left hemisphere on CT scans. This method formed the basis for an evaluation of the extent and localization of the patients' lesions in Wernicke's area. Of 46 patients with lesions in the left hemisphere, 19 had no perceptual disturbances and 27 had severe perceptual disturbances with lesions predominantly located in Wernicke's area. Twenty-two patients with lesions in the corresponding area in the right hemisphere showed no perceptual disturbances. The results of this investigation appear to indicate that the perception of vowels in right-handed persons is unilaterally located in Wernicke's area in the left hemisphere.

Adolescent↗
PubMed2003

Neurobiology of emotion perception I: The neural basis of normal emotion perception.

There is at present limited understanding of the neurobiological basis of the different processes underlying emotion perception. We have aimed to identify potential neural correlates of three processes suggested by appraisalist theories as important for emotion perception: 1) the identification of the emotional significance of a stimulus; 2) the production of an affective state in response to 1; and 3) the regulation of the affective state. In a critical review, we have examined findings from recent animal, human lesion, and functional neuroimaging studies. Findings from these studies indicate that these processes may be dependent upon the functioning of two neural systems: a ventral system, including the amygdala, insula, ventral striatum, and ventral regions of the anterior cingulate gyrus and prefrontal cortex, predominantly important for processes 1 and 2 and automatic regulation of emotional responses; and a dorsal system, including the hippocampus and dorsal regions of anterior cingulate gyrus and prefrontal cortex, predominantly important for process 3. We suggest that the extent to which a stimulus is identified as emotive and is associated with the production of an affective state may be dependent upon levels of activity within these two neural systems.

Animals↗
PubMed1995

The influences of goal-related action and goal information on children's perceptions of trying and wanting: an action-perception approach.

The influences of goal-related actions and goal information on children's try-and-want perceptions were investigated with an action-perception approach (i.e., Heider, 1958). Kindergartners, second graders, and fifth graders heard stories that depicted actors engaged in one action, that same action three times, or three equifinal actions to attain a positive or negative goal. The children rated how much actors tried and wanted to attain the goal. The findings indicate that the actors who engaged in only one action were perceived to have tried and wanted the least, and the actors who engaged in equifinal actions were perceived to have tried and wanted the most. The actors who engaged in one action were not significantly differentiated from those who engaged in repetitive actions. However, the actors who engaged in repetitive actions were significantly differentiated from those who engaged in equifinal actions. For try ratings only, the children made all expected differentiations of actors by goal-related action in negative goal conditions, whereas fewer differentiations were made of actors in positive goal conditions. Age-related findings indicate that only younger children perceived that the actors who pursued positive goals tried and wanted more than those who pursued negative goals.

Child↗
PubMed2004

An emotion-based model of risk perception and stigma susceptibility: cognitive appraisals of emotion, affective reactivity, worldviews, and risk perceptions in the generation of technological stigma.

A study (N=198) was conducted to examine hypotheses derived from an emotion-based model of stigma responses to radiation sources. A model of stigma susceptibility is proposed in which affective reactions and cognitive worldviews activate predispositions to appraise and experience events in systematic ways that result in the generation of negative emotion, risk perceptions, and stigma responses. Results of structural equation modeling supported the hypotheses. Radiation sources that scored higher on a measure of stigma were included in the analyses (i.e., nuclear power plants, radioactive waste from nuclear power plants, radiation from nuclear weapons testing). Individual differences in negative reactivity and worldviews were associated with the strength of emotional appraisals that were associated, in turn, with negative emotion toward stigmatized radiation sources. As hypothesized, the model fit better with perceived risk as a function of negative emotion rather than vice versa. Finally, a measure of stigma was associated with negative emotion and, to a lesser extent, with risk perceptions. Risk communication about stigmatized objects may benefit from a more complete understanding of how affective and emotional reactions are constructed and the routes through which they affect responses and behaviors.

Affect↗
PubMed1992

Modeling phoneme perception. I: Categorical perception.

On the basis of a number of vowel and stop-consonant discrimination experiments (AX and 2IFC fixed and roving) with natural stimuli, it is concluded that stop-consonant perception is highly categorical: there were few significant differences between the discrimination results and the phoneme identification results. Moreover, the discrimination and identification response maxima differed significantly from the other data points. Vowel perception was much less categorical: the maxima in the functions were much less significant, and there were significant differences between the various paradigms. Consonant discrimination was much less (if at all) subject to range effects than vowel discrimination. All these results point to different memory types for stop consonants and vowels, and, consequently, to a combination of two different theories of speech sound discrimination: dual-process theory (DPT) for consonants, and trace-context theory (TCT) for vowels.

Adult↗
PubMed1984

Are theories of perception necessary? A review of Gibson's The Ecological Approach to Visual Perception.

Representational theories of perception postulate an isolated and autonomous "subject" set apart from its real environment, and then go on to invoke processes of mental representation, construction, or hypothesizing to explain how perception can nevertheless take place. Although James Gibson's most conspicuous contribution has been to challenge representational theory, his ultimate concern was the cognitivism which now prevails in psychology. He was convinced that the so-called cognitive revolution merely perpetuates, and even promotes, many of psychology's oldest mistakes. This review article considers Gibson's final statement of his "ecological" alternative to cognitivism (Gibson, 1979). It is intended not as a complete account of Gibson's alternative, however, but primarily as an appreciation of his critical contribution. Gibson's sustained attempt to counter representational theory served not only to reveal the variety of arguments used in support of this theory, but also to expose the questionable metaphysical assumptions upon which they rest. In concentrating upon Gibson's criticisms of representational theory, therefore, this paper aims to emphasize the point of his alternative scheme and to explain some of the important concerns shared by Gibson's ecological approach and operant psychology.

Animals↗
PubMed1978

Analysis of the Development Test of Visual Perception and the Motor-Free Visual Perception Test.

To identify children with learning problems and to compare test results, 28 kindergarten children were tested with the Developmental Test of Visual Perception and the Motor-free Visual Perception Test. The tests identified some children already noted by the teacher to exhibit characteristics of learning difficulty, failed to confirm the teacher's judment in others, and identified some children with previously undetected difficulties. Basic differences in the two tests are reported.

Child↗
PubMed2005

Visual outcome and risk factors for light perception and no light perception vision after vitrectomy for diabetic retinopathy.

PURPOSE: To assess the visual outcome following vitrectomy for diabetic retinopathy compared with previous studies; to evaluate risk factors for light perception (LP) and no light perception (NLP) vision after diabetic vitrectomy. DESIGN: Retrospective medical record review. METHODS: The charts of 100 consecutive patients who underwent vitrectomy for proliferative diabetic retinopathy between November 1, 1997, and November 30, 1998, were reviewed. Surgical technique included standard pars plana vitrectomy with combination of delamination and segmentation of gliotic tractional membranes using bimanual techniques. All patients had post-operative follow-up of at least 12 months. Several factors were analyzed for their effect on poor visual outcome (LP and NLP) using Fisher's exact test. RESULTS: Post-vitrectomy, 73% of diabetic patients had stable or improved vision; 16% had worsened but functional vision, defined as worse but still >or= 20/400; 4% had worsened but ambulatory vision, defined as worse but still count fingers (CF) or hand motion (HM); and 7% had poor visual outcome, LP or NLP. Resultant visual acuity was >or=20/40 in 38% of patients, 20/50 to 20/100 in 34%, 20/120 to CF in 18%, HM in 3%, LP in 4%, and NLP in 3%. Risk factors for eyes with LP and NLP vision included pre-operative iris neovascularization (INV), P = .05, post-operative INV, P = .02, post-operative macular ischemia, P = .0001, and post-operative vitreous hemorrhage (VH), P = .02. CONCLUSIONS: Pre-operative and post-operative INV, post-operative macular ischemia, and post-operative VH appear to be risk factors for LP and NLP vision following diabetic vitrectomy, whereas overall improvements in surgical technique and visual outcome continue to be reported.

Adult↗
PubMed2006

Teachers' perceptions in central Turkey concerning epilepsy and asthma and the short-term effect of a brief education on the perception of epilepsy.

This study was aimed at assessing and comparing schoolteachers' perceptions of epilepsy and asthma in central Turkey. Two-hundred seventy-five schoolteachers completed a questionnaire on their knowledge, attitudes, and practice. There were 18 pairs of questions on the questionnaire (one question in each pair pertained to epilepsy, and the other to asthma). One month later, following a brief education program on epilepsy, participants completed the epilepsy section of the questionnaire a second time. Among the teachers, initial rates of acceptance of children with epilepsy were significantly lower than the rates for asthma. Children with epilepsy were less encouraged by teachers to play with others and were perceived as more aggressive. More teachers were worried about other parents objecting to having a child with epilepsy in the class. Following the brief education program, there was a significant positive change in the teachers' perception of epilepsy.

Adult↗
PubMed1997

Project 2000: perceptions of the philosophy and practice of nursing: shifting perceptions--a new practitioner?

This is the first of two papers which address aspects of the findings of a large scale study commissioned by the English National Board which set out to examine the impact of Project 2000 on perceptions of the philosophy and practice of nursing. The findings presented here suggest that there have been fundamental shifts in perceptions of the nature and discipline of nursing. Students and diplomates of the course perceive themselves as knowledgeable doers, with their practice well grounded in theory and research. They value the interpersonal skills teaching and place the patient firmly at the centre of care delivery, viewing the patient holistically and being prepared to be fierce patient advocates where necessary. It is difficult to determine the extent to which these shifts can be attributed to the Project 2000 course, although the Project 2000 approach to education appears to be an important factor.

Attitude of Health Personnel↗
PubMed2003

Disease perceptions of Brazilian fibromyalgia patients: do they resemble perceptions from other countries?

The purpose of this study was to discover how Brazilian fibromyalgia patients perceive their disease. Fifteen women who fulfilled the American College of Rheumatology Classification Criteria for Fibromyalgia were given an individual semi-structured interview about their perception of fibromyalgia. There was a marked uniformity in the description of clinical symptoms, with diffuse pain and fatigue being considered the most important symptoms. Pain descriptions were imprecise as to the main localization but insidious pain of moderate intensity was frequently described. Other referred symptoms were: sleep disturbances, anxiety and memory and concentration difficulties. The following points were considered to be trigger events for pain: intense physical efforts, physical trauma, climate variation and genetic heritage. The reported modulating factors were: stressful events, emotional disturbances, climate variation and period of the day. Most patients reported being unable to control the symptoms of fibromyalgia. Religious support, reduction of tasks, physical exercises and short resting periods during the day were the main coping strategies mentioned by the interviewed patients. Their main concern was an eventual evolution to total physical incapacity and loss of independence in self-care. The clinical characteristics and patient perceptions in these Brazilian patients are very similar to those described in international studies.

Adaptation, Psychological↗
PubMedDate not supplied

Dental student perceptions of the elderly: measuring negative perceptions with projective tests.

Stereotypic perceptions of older patients have been documented to influence relationships with older adults. To assess the impact of age and dentate status on dental student treatment decisions and perceptions of patients, we designed a qualitative study utilizing projective tests. Seventy first- and third-year dental students wrote stories about two "cue" statements, one describing a young patient and one an older patient. Each cue varied by dentate status, having either a complete dentition or seven remaining teeth. The stories were evaluated for negativity and for general themes of stereotypic statements. The results indicated that while patient age did not influence the dental care prescribed, a high level of negativity existed toward old patients in general (45%, older patient with teeth; 47%, older patient with seven teeth) and toward a younger patient with few remaining teeth (57.6%). The level of negativity expressed toward the young patient with full dentition (27%) may suggest a patient gender bias among dental students in this sample.

Adult↗
PubMed1998

Self-perception and perception of age groups as a function of the perceiver's category membership.

This research examined self-perception and the perception of age groups by young and elderly adults from the perspective of social identity theory and social categorization theory. Respondents rated either themselves or unfamiliar stimulus persons from three age categories in adulthood: young, middle-aged, and elderly. As expected, an ingroup bias was found in the evaluation of elderly adults. Specifically, compared to ratings made by younger adults, older adults evaluated elderly persons more favorably. Moreover, as predicted, elderly adults' self-evaluations and those of young adults asked to imagine themselves as elderly were more positive than the ratings made by respondents who evaluated an unfamiliar older adult (e.g., elderly woman, elderly man). Both cognitive and motivational processes were discussed as contributing to the phenomenon of self-other discrepancy in beliefs about and attitudes toward older adults.

Adult↗
PubMed2002

[Functional intestinal disorders: assessment and perception by physicians of their patients perception. Results of two national studies].

OBJECTIVE: In 1999, a first national survey on functional intestinal disorders (FID) revealed the patients' good perception of the medical corps and treatments proposed. The aim of the present study was to assess the physicians' perception of their patients, their symptoms and their degree of satisfaction. METHODS: The survey was conducted among the physicians who had recruited the patients of the initial study. Eight hundred and eighty five replies were analysed (general practitioners--GPs: 88%; gastro-enterologists--GE: 11%). RESULTS: The mean number of patients with FID seen in one week was of 11.40 (GP: 10.80; GE: 16.29). Thirty percent of patients were seen for the first time by a GP and 65 percent by a GE. The mean yearly number of consultations for these patients was of 7.16 for the GPs and 3.81 pour les GEs. A coloscopy was prescribed by 49% of GPs and 66% of GEs. The pain and transit disorders mentioned in 98 and 78.7% of cases had evolved over a mean of 56.57 months. COMMENTS: Although aware of the repercussion of FID in daily life, the practitioners evaluated a psychological component of 69% in the expression of the disorder. They considered the pain intense in 6% of cases versus the 41% expressed by the patient. The scores out of 10 for 8 items showed a mean result of 6.86 in their evaluation of the degree of the patients' understanding of their disease and its treatment, and of 6.13 for the quality of the medical act. These same criteria, assessed one year earlier by the patients themselves, showed better scores.

Adult↗
PubMedDate not supplied

Parents' perception of their children's development, perception of satisfaction, social support and level of depression.

The purpose of this study was to describe how parents and guardians in rural South Africa reported on the development of their children, their perception of social support and satisfaction, their level of depression, and the relationships that exist among the variables. The data from a larger research study were used to answer these questions: Is there a relationship between the child's development status and the parents/guardians level of satisfaction and social support? Is there a difference in the educational level of the parents/guardians and their perception of social support and the level of satisfaction? What is the percentage of parents/guardians working/not working? Is there a relationship between the status of work of the parents/guardians and the level of depression? Is there a relationship between the age of the parents/guardians and their level of depression? A convenience sample of 198 parents/guardians was recruited. Interviews were conducted using a structured interview guide. Relationships and differences were analyzed using Pearson's r correlation index, paired t-tests and regression analysis. The majority (73.7%) of the respondents were unemployed. No significant relationships were found between the child's developmental status and the parents/guardians perceived level of social support and satisfaction. However, the difference between the educational level of parents/guardians and the level of perceived social support was significant. Additionally, as the amount of family strains increased so did the parental level of depression.

Adult↗