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Results for “perceived”

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PubMed1998

Change in visually perceived eye level without change in perceived pitch.

Both the physical elevation that appears to correspond to eye level and the visually perceived pitch of a visual field are linear functions of the physical pitch of a normally illuminated, complexly structured visual field. One of the possible bases for the large effect of physical pitch on the elevation of visually perceived eye level (VPEL) is that the visual field generates a mental representation which specifies spatial coordinates and these determine the VPEL elevation ('implicit-surface model'; ISM). The influence on the elevation of VPEL is nearly as large when the visual field contains either one or two long pitched-from-vertical or rolled-from-vertical lines in otherwise total darkness as when it consists of a well-illuminated and complexly structured pitched room (L Matin and W Li, 1994 Vision Research 34 311-330), and, in order to examine the ISM, we employed a rolled-from-vertical, two-line configuration within a frontoparallel plane viewed in otherwise total darkness. Measurements of visually perceived pitch were made by a manual matching procedure and VPEL measurements were made by the psychophysical setting of the elevation of a small visual target to appear at eye level while each of three subjects viewed the two-line configuration at each of three horizontal eccentricities with the configuration at each of seven roll orientations. In direct contradiction to the ISM, the perceived pitch of the two-line configuration did not deviate significantly from the erect orientation ('vertical') for any roll at any eccentricity, but the elevation of VPEL changed systematically with the roll of the configuration both at left and at right eccentricities, and did not change at all with the two-line configuration centered on the median plane. Consistent with our previous work and with our previous interpretation regarding the basis for VPEL (L Matin and W Li, 1994 Vision Research 34 2577-2598), the variation of VPEL for the two-line visual field equals the average of the VPEL variations produced by viewing each of the single lines separately.

Humans↗

PubMed1999

Perceived social control as a mediator of the relationships among social support, psychological well-being, and perceived health.

The purpose of the present study was to delineate the process by which social support facilitates better health outcomes in older adulthood. In order to best understand the process behind the support-outcome relationship, an aspect of perceived control specific to the social domain was hypothesized to mediate the said relationship. Measures of social support included quantity of support from family and friends and the perceived satisfaction with that support. Outcome measures included depression, life satisfaction, and self-reported perceived physical health. Based on previous research, the hypothesized model of control serving as a mediator was tested against two alternative hypotheses including an examination of control as a moderator of the support-outcome relationship as well as support as a mediator of the control-outcome relationship. Results indicated that perceived control mediates the support-outcome relationship in two independent samples, each comprised of approximately 250 adults older than 65, primarily Caucasian and functioning independently, illustrating the strong replicative nature of the findings. This examination begins to illuminate the process by which social support may facilitate well-being in older adulthood by focusing on the internal structures that may play a crucial role in the utilization of the social support.

Adaptation, Psychological↗

PubMedDate not supplied

Quality competition among hospitals: the effects of perceived quality and perceived expense on health care consumers.

Quality of care rather than price is the main concern in health care. However, does price not matter at all? To investigate what quality and cost factors influence whether patients perceive health care services as expensive and will recommend a hospital to other patients, the authors analyzed data from a national survey of patients in Taiwan in 2002. A total of 6725 subjects returned questionnaires. Results from logistic regression models showed that (1) a patient's perception of expense was determined simultaneously with the perceived quality and the out-of-pocket price of care, (2) a patient's perception of hospital quality appeared to be the most important determinant for recommending a hospital, and(3) while the out-of-pocket price did not affect a patient's recommendation, the perceived expense of the services did. The perceived value rather than the price itself-is the essence of quality competition in Taiwan's health care market.

Adolescent↗

PubMedDate not supplied

Assessing perceived change in the well-being of family caregivers: psychometric properties of the Perceived Change Index and response patterns.

The purpose of this study was to evaluate the psychometric properties of the Perceived Change Index (PCI), a 13-item scale that measures caregiver appraisals of self-improvement or decline in distinct areas of well-being, and to examine demographic differences in responses. The scale was administered to 255 care-givers participating at the Philadelphia site of the National Institute of Aging-funded Resources for Enhancing Alzheimer's Caregiver Health initiative. Principal axis analysis with one half of the sample was used to evaluate factor structure. Evidence of convergent and divergent validity was examined using the second half of the sample. Differential response patterns by caregiver characteristics were also examined using regression analysis. Using one half of the sample, 3 underlying factors were found (affect, alpha = .85; somatic, alpha = .80; management, alpha = .76), accounting for 63% of the variance. The overall index was internally consistent (Cronbach's alpha = .90). Using the second half of the sample, Pearson correlational analyses of the overall index and its subscales revealed that perceived improvement was significantly associated with fewer depressive symptoms, higher scores on perceived positive aspects of caregiving, and more participation in social activities. As expected, it was not associated with the care recipient's Mini-Mental Status Examination scores or functional status. Perceived improvement scores for specific areas of well-being were associated with being African American, male, and a spouse. The PCI is a brief, easily administered, and valid self-report measure that can serve as an indicator of caregiver appraisal of well-being in research and clinical practice.

Adaptation, Psychological↗

PubMed1980

Effect of perceived size upon perceived brightness.

The increase in perceived size which occurs with an increase in perceived brightness has been known for some time. A reverse effect--an increase in perceived brightness with a decrease in perceived size--is demonstrated.

Color Perception↗

PubMed1985

Verbal responses of male college students to human figure paintings varying in collative properties, perceived sexuality, and perceived aggression.

20 male undergraduates rated 60 human figure paintings on verbal scales to index collative variability (e.g., simple-complex), perceived sexuality, and perceived aggression in the stimuli. Regression equations were used to predict epistemic (interest) and diversive (pleasingness) responses to the paintings. Collative variability predicted diversive but not epistemic appreciation. Perceived aggression was the strongest predictor for both types of aesthetic reaction. Perceived sexuality was most strongly related to diversive appreciation. Both linear and nonlinear functions emerged and these were discussed in terms of consistency with Berlyne's 1971 theory of aesthetics.

Adolescent↗

PubMed1992

The interaction of perceived distance with the perceived direction of visual motion during movements of the eyes and the head.

A horizontally moving target was followed by rotation of the eyes alone or by a lateral movement of the head. These movements resulted in the retinal displacement of a vertically moving target from its perceived path, the amplitude of which was determined by the phase and amplitude of the object motion and of the eye or head movements. In two experiments, we tested the prediction from our model of spatial motion (Swanston, Wade, & Day, 1987) that perceived distance interacts with compensation for head movements, but not with compensation for eye movements with respect to a stationary head. In both experiments, when the vertically moving target was seen at a distance different from its physical distance, its perceived path was displaced relative to that seen when there was no error in perceived distance, or when it was pursued by eye movements alone. In a third experiment, simultaneous measurements of eye and head position during lateral head movements showed that errors in fixation were not sufficient to require modification of the retinal paths determined by the geometry of the observation conditions in Experiments 1 and 2.

Adult↗

PubMed2002

The perceived handicap questionnaire: a self perceived handicap measurement in patients with spinal cord injury.

Handicap exists when individuals with impairment or disability are unable to fulfill one or more of the roles that are considered normal for their age, gender, and culture. In fact, handicap is one of the most poorly measured of all rehabilitation outcomes. This study was performed to measure the subjective experience of handicap in spinal cord injury (SCI) patients who had permanent disabilities and were often faced with environmental barriers. Eighty-three new traumatic SCI patients with a mean age of 33 years were interviewed during follow-up outpatient clinic visits using the Perceived Handicap Questionnaire (PHQ). This test provides a global measurement of the extent of self-perceived handicap across five dimensions based on the WHO's classification of handicap. When compared with normal persons, SCI subjects perceived themselves as more handicapped in all dimensions especially mobility and physical independence. In contrast, the majority of SCI subjects perceived themselves as less handicapped than others with SCI in physical independence, and equally handicapped in social integration and in economic self-sufficiency. In addition, the Barthel Index Score of self-care activities was negatively correlated with the PHQ score, but the depression score and hospitalization period were positively correlated with the PHQ score. Rehabilitation professionals should pay attention to the measurement of societal functioning or handicap in addition to disability.

Adolescent↗

PubMed1995

Perceived determinants of risk for breast cancer and the relations among objective risk, perceived risk, and screening behavior over time.

Interrelations among perceived risk for breast cancer, objective risk factors, and both breast self-examination (BSE) and mammography screening were examined across two waves of a longitudinal study of breast cancer screening. Participants were a community sample of 335 predominantly White middle-class women, aged 37 to 77, who had not had breast cancer. Factors believed by women to determine their self-rated risk level for breast cancer were investigated. Women held optimistic biases about their own breast cancer risk; they often erroneously attributed their relatively lower perceived risk to personal actions, including mammography screening. Compliance with mammography screening but not BSE recommendations increased over time. Perceived susceptibility to breast cancer was related to both family history and breast symptomatology; early mammography screening was positively related to perceived susceptibility later in time.

Adult↗

PubMed1989

Visually perceived eye level and perceived elevation of objects: linearly additive influences from visual field pitch and from gravity.

Observing a pitched visual field (i.e. tilted around a horizontal axis in the observer's frontal plane) results in large changes in the elevation visually perceived to correspond to eye level (VPEL) and in the perceived elevation and size of stationary objects viewed against the field. With topforward pitch (top toward observer) VPEL lies above true eye level and objects appear smaller and lower; with topbackward pitch VPEL lies below true eye level and objects appear larger and higher. Oscillation of the pitched field induces synchronous perceived oscillation of elevation of a stationary target viewed against the field. Typical VPEL settings deviated from true eye level by 20 degrees with the field pitched at 40 degrees, although some individuals mislocalized by as much as 40 degrees. VPEL varied linearly with visual field pitch with individual slopes for the relation between VPEL and visual field pitch ranging from +0.42 to +0.78 (avg = +0.56). The linear correlation (r) between VPEL in darkness and against an erect visual field was +0.91. The two relations--VPEL vs visual field pitch, VPEL in darkness vs VPEL in the erect illuminated visual field (slope approximately equal to 0.5)--are both accurately predicted by the linear model: VPEL = kvV + kbB; in which V is the influence of visual field structure and B is the influence of the body-referenced mechanism which combines information regarding the orientation of the head relative to gravity, the position of the eye in the orbit, and the vertical location of the image on the retina; kv and kb are the relative weights of V and B with kv + kb = 1. In an illuminated field kv = kb approximately equal to 0.5; in the dark kv = 0, kb = 1.

Gravitation↗

PubMed1990

The influence of spatial frequency on perceived temporal frequency and perceived speed.

Speed matching experiments were conducted using drifting gratings of different spatial frequencies in order to assess the influence of spatial frequency on perceived speed. It was found that gratings of high spatial frequency appear to drift more slowly than low spatial frequency gratings of the same actual velocity. The perceived temporal frequency of a counterphase grating similarly declines as spatial frequency increases. The previously reported effect of temporal frequency on perceived spatial frequency probably does not contribute to these phenomena. Our results suggest that the motion sensors thought to operate within different spatial frequency ranges have different velocity transfer functions, a fact not incorporated in existing computational models of motion perception.

Contrast Sensitivity↗

PubMed2000

Perceived probability, perceived severity, and health-protective behavior.

It seems obvious that 2 key attributes of health hazards, their perceived probability and perceived severity, do not act independently on the motivation to engage in protective behavior. If a health problem is perceived to have no chance of occurring, there should be no interest in acting against it, regardless of how serious it might be. Nevertheless, researchers seldom observe the expected interaction between probability and severity. A case study approach was used to examine how probability and severity combine to influence interest in protection. Ratings of motivation to act, probability, and severity for 201 hazards were collected from 12 participants, and data were analyzed for each person separately. Analyses revealed the expected Probability x Severity interaction. Additional calculations showed why it is difficult to detect this interaction using between-subjects designs. The data also revealed that people are surprisingly insensitive to variations in hazard probability when probabilities are in the moderate to high range.

Adult↗

PubMed1994

Investigation of perceived environment, perceived outcome, and person variables in relationship to voluntary development activity by employees.

The authors examined perceived environment, perceived incentive and outcome, and person constructs for relationships with interest and participation in voluntary learning and development activity by nonmanagement employees. All 3 groups of constructs were related to development activity. In relationships with development activity, perceived outcome and environment variables interacted with workers' personal values relevant to aspects of a development setting, illustrating the potentially important role that differences in values may play in a development setting, illustrating the potentially important role that differences in values may play in a development context. Additionally, small relationships were observed between several demographic variables and values within a development setting. Results provide implications for the design and implementation of successful development programs and highlight the need to carefully consider individual differences in this context when targeting many different types of employees for participation.

Adult↗

PubMed2003

Association of perceived physician communication style with patient satisfaction, distress, cancer-related self-efficacy, and perceived control over the disease.

The aim of the study was to investigate the association of physician communication behaviours as perceived by the patient with patient reported satisfaction, distress, cancer-related self-efficacy, and perceived control over the disease in cancer patients. Questionnaires measuring distress, self-efficacy, and perceived control were completed prior to and after the consultation by 454 patients attending an oncology outpatient clinic. After the consultation, the patients also rated the physicians' communicative behaviours by completing a patient-physician relationship inventory (PPRI), and the physicians were asked to estimate patient satisfaction. The overall results showed that higher PPRI scores of physician attentiveness and empathy were associated with greater patient satisfaction, increased self-efficacy, and reduced emotional distress following the consultation. In contrast, lower PPRI scores were associated with reduced ability of the physician to estimate patient satisfaction. The results confirm and expand previous findings, suggesting that communication is a core clinical skill in oncology.

Humans↗

PubMed1996

The role of retinal versus perceived size in the effects of pitched displays on visually perceived eye level.

Visually perceived eye level (VPEL) was measured while subjects viewed two vertical lines which were either upright or pitched about the horizontal axis. In separate conditions, the display consisted of a relatively large pair of lines viewed at a distance of 1 m, or a display scaled to one third the dimensions and viewed at a distance of either 1 m or 33.3 cm. The small display viewed at 33.3 cm produced a retinal image the same size as that of the large display at 1 m. Pitch of all three displays top-toward and top-away from the observer caused upward and downward VPEL shifts, respectively. These effects were highly similar for the large display and the small display viewed at 33.3 cm (ie equal retinal size), but were significantly smaller for the small display viewed at 1 m. In a second experiment, perceived size of the three displays was measured and found to be highly accurate. The results of the two experiments indicate that the effect of optical pitch on VPEL depends on the retinal image size of stimuli rather than on perceived size.

Adolescent↗

PubMed2006

Goal orientation profile differences on perceived motivational climate, perceived peer relationships, and motivation-related responses of youth athletes.

The aims of this study were twofold: (a) to determine if dispositional achievement goal orientation profiles that are reported in the literature would be observed in a sample of youth athletes, and (b) to examine potential achievement goal orientation profile differences on perceptions of the motivational climate, perceptions of peer relationships, and motivation-related responses. Male soccer players (n=223) aged 9-12 years (mean=10.9, s=0.6) completed a multi-section questionnaire containing assessments of dispositional goal (task, ego) orientations, the perceived task- and ego-involving features of the motivational climate, perceived peer acceptance and friendship quality (positive friendship quality, conflict), perceived ability, soccer enjoyment, and satisfaction with one's performance and the team. Four profiles were observed that closely matched those observed by Hodge and Petlichkoff (2000), though in the present study a lower proportion of participants exhibited achievement goal profiles consisting of relatively high ego orientation. Achievement goal profile differences were found for all variables except positive friendship quality, with a general trend for those reporting relatively lower task goal orientation to exhibit less adaptive responses. Overall, the findings support achievement goal frameworks (e.g. Nicholls, 1989) and suggest that further examination of dispositional achievement goals may afford a deeper understanding of social relationships and motivational processes in youth sport.

Achievement↗

PubMed2004

The effects of state mental health parity legislation on perceived quality of insurance coverage, perceived access to care, and use of mental health specialty care.

OBJECTIVE: To assess the impacts of recent state mental health parity legislation on perceived quality of health insurance coverage, perceived access to needed health care, and use of mental health specialty services by individuals with likely need for mental health care. DATA SOURCES: The study sample came from two waves of a national household survey first fielded in 1997-1998 and then in 2000-2001. The analysis used a subset of the sample. STUDY DESIGN: The study took the Difference-in-Difference-in-Difference approach to investigate changes in self-perceived quality of health insurance coverage and access to needed health care, and use of mental health specialty care by the group with mental disorders (relative to those without) in states with parity legislation of different comprehensiveness (relative to the nonparity states) in the years after the law (relative to before the law). PRINCIPAL FINDINGS: Overall, there were no significant or consistent effects of the parity legislation. Descriptive statistics showed significant changes in some (but not all) outcome variables, but these results disappeared in detailed statistical analyses by controlling for important covariates. CONCLUSIONS: The null findings of the effects of state mental health parity mandates suggest that under ERISA (Employee Retirement Income Security Act), the scope of state parity legislation may have been restricted because of large proportion of self-insured employers. Furthermore, comprehensiveness of state legislation appears to be related to the traditional level of use of mental health specialty care, which becomes another confounder for the potential policy effects.

Attitude to Health↗

PubMed2004

Importance of patient pressure and perceived pressure and perceived medical need for investigations, referral, and prescribing in primary care: nested observational study.

OBJECTIVE: To assess how pressures from patients on doctors in the consultation contribute to referral and investigation. DESIGN: Observational study nested within a randomised controlled trial. SETTING: Five general practices in three settings in the United Kingdom. PARTICIPANTS: 847 consecutive patients, aged 16-80 years. MAIN OUTCOMES MEASURES: Patient preferences and doctors' perception of patient pressure and medical need. RESULTS: Perceived medical need was the strongest independent predictor of all behaviours and confounded all other predictors. The doctors thought, however, there was no or only a slight indication for medical need among a significant minority of those who were examined (89/580, 15%), received a prescription (74/394, 19%), or were referred (27/125, 22%) and almost half of those investigated (99/216, 46%). After controlling for patient preference, medical need, and clustering by doctor, doctors' perceptions of patient pressure were strongly associated with prescribing (adjusted odds ratio 2.87, 95% confidence interval 1.16 to 7.08) and even more strongly associated with examination (4.38, 1.24 to 15.5), referral (10.72, 2.08 to 55.3), and investigation (3.18, 1.31 to 7.70). In all cases, doctors' perception of patient pressure was a stronger predictor than patients' preferences. Controlling for randomisation group, mean consultation time, or patient variables did not alter estimates or inferences. CONCLUSIONS: Doctors' behaviour in the consultation is most strongly associated with perceived medical need of the patient, which strongly confounds other predictors. However, a significant minority of examining, prescribing, and referral, and almost half of investigations, are still thought by the doctor to be slightly needed or not needed at all, and perceived patient pressure is a strong independent predictor of all doctor behaviours. To limit unnecessary resource use and iatrogenesis, when management decisions are not thought to be medically needed, doctors need to directly ask patients about their expectations.

Adolescent↗