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PubMed2003

Reconstructive memory related to adolescent-parent conflict interactions: the influence of attachment-related representations on immediate perceptions and changes in perceptions over time.

This investigation examined the hypothesis that individuals change, over time, their perceptions of interactions with attachment figures in ways that are consistent with their attachment-related representations of those individuals. In an original and a replication study, adolescents participated in laboratory conflict discussions with each of their parents. Adolescents rated their perceptions of the interactions immediately after the conflict discussions, then again 6 weeks later. Results indicated that (a) adolescents' immediate perceptions of the interactions were influenced by their attachment-related representations of their parents, and (b) adolescents' perceptions, over a period of 6 weeks, shifted such that their later perceptions were more congruent with their attachment-related representations than were their immediate perceptions. Implications for the continuity of relational models and relationship patterns are discussed.

Adolescent↗
PubMed1987

Transition from student to physical therapist. Changes in perceptions of professional role and relationship between perceptions and job satisfaction.

A longitudinal study of 15 entry-level postbaccalaureate degree graduates was conducted to determine whether their perceptions of the professional role of the physical therapist and of self in that role changed after employment had begun and whether a relationship exists between these perceptions and job satisfaction. Data were collected by mail using a semantic differential test for measuring role perceptions and a questionnaire that included items related to job satisfaction and to demographic data. The return rate was 93%. At the time of data collection, the graduates had been employed for 12 to 18 months. The data on role perceptions were compared with data previously reported by Fincher Corb et al that had been collected on these same subjects when they entered the physical therapy education program and when they completed the program. Kendall's coefficient of concordance revealed significant differences (p less than .05) in three concepts relating to the professional role of the physical therapist and in one concept relating to self in that role. In each instance, the role perception score was lower after 12 to 18 months of employment. Job satisfaction scores were relatively high among the subjects. Spearman correlation coefficients calculated between job satisfaction and role perception scores revealed a positive and direct relationship between three role concepts and job satisfaction. Results of this study provide information about the professional socialization process in physical therapy.

Humans↗
PubMed1978

Categorical perception--phenomenon or epiphenomenon: evidence from experiments in the perception of melodic musical intervals.

Categorical perception was investigated in a series of experiments on the perception of melodic musical intervals (sequential frequency ratios). When procedures equivalent to those typically used in speech-perception experiments were employed, i.e., determination of identification and discrimination functions for stimuli separated by equal physical increments), musical intervals were perceived categorically by trained musicians. When a variable-step-size (adaptive) discrimination procedure was used, evidence of categorical perception (in the form of smaller interval-width DL's for ratios at identification category boundaries than for ratios within categories), although present initially, largely disappeared after subjects had reached asymptotic performance. However, equal-step-size discrimination functions obtained after observers had reached asymptotic performance in the adaptive paradigm were not substantially different from those initially obtained. The results of other experiments imply that this dependence of categorical perception on procedure may be related to differences in stimulus uncertainty between the procedures. An experiment on the perception of melodic intervals by musically untrained observers showed no evidence for the existence of "natural" categories for musical intervals.

Humans↗
PubMed2001

The independence of size perception and distance perception.

Research on distance perception has focused on environmental sources of information, which have been well documented; in contrast, size perception research has focused on familiarity or has relied on distance information. An analysis of these two parallel bodies of work reveals their lack of equivalence. Furthermore, definitions of familiarity need environmental grounding, specifically concerning the amount of size variation among different tokens of an object. To demonstrate the independence of size and distance perception, subjects in two experiments were asked to estimate the sizes of common objects from memory and then to estimate both the sizes and the distances of a subset of such objects displayed in front of them. The experiments found that token variation was a critical variable in the accuracy of size estimations, whether from memory or with vision, and that distance had no impact at all on size perception. Furthermore, when distance information was good, size had no effect on distance estimation; in contrast, at far distances, the distances to token variable or unknown objects were estimated with less accuracy. The results suggest that size perception has been misconceptualized, so that the relevant research to understand its properties has not been undertaken. The size-distance invariance hypothesis was shown to be inadequate for both areas of research.

Adult↗
PubMed1987

What does infant perception tell us about theories of perception?

The article begins with a summary of eight well-substantiated conclusions drawn from research on perception in infants that have implications for theories of perception. The following section examines several traditional and modern theories of perception in the light of these conclusions. Finally, some "big issues" that have divided perceptual and cognitive theories are discussed, with the suggestion that research on infants can help reconcile the divided camps. Research on perception in young infants not only flourishes but also presents a challenge to all theories of perception.

Child Development↗
PubMed2004

The role perception questionnaire (RPQ): a tool for assessing undergraduate students' perceptions of the role of other professions.

A systematic review of interprofessional education (Freeth et al., 2002) revealed that there were many weaknesses in the current body of knowledge of interprofessional education outcomes. One reason for this was the lack of good quality study designs for evaluating the outcomes of interprofessional education. This paper discusses the range of tools that were found in the literature and describes the production and validation of two questionnaires that can be used as part of an interprofessional evaluation strategy. Firstly, a Generic Role Perception Questionnaire which can be used for measuring the perception of the role of a range of professions and a Nursing Role Perception Questionnaire used specifically for measuring the perception of the role of a nurse. Repertory grid technique was selected to elicit constructs from a multiprofessional group of final year undergraduate students. This pool was then used to develop the two questionnaires. Factor analysis, internal consistency and test re-test measures are used along with evidence of validity. The questionnaires were found to have acceptable validity and reliability and could be used as part of an IPE evaluation strategy to measure changes in professional role perception in an undergraduate population.

Attitude of Health Personnel↗
PubMed2003

Patterns of phoneme perception errors by listeners with cochlear implants as a function of overall speech perception ability.

Many studies have noted great variability in speech perception ability among postlingually deafened adults with cochlear implants. This study examined phoneme misperceptions for 30 cochlear implant listeners using either the Nucleus-22 or Clarion version 1.2 device to examine whether listeners with better overall speech perception differed qualitatively from poorer listeners in their perception of vowel and consonant features. In the first analysis, simple regressions were used to predict the mean percent-correct scores for consonants and vowels for the better group of listeners from those of the poorer group. A strong relationship between the two groups was found for consonant identification, and a weak, nonsignificant relationship was found for vowel identification. In the second analysis, it was found that less information was transmitted for consonant and vowel features to the poorer listeners than to the better listeners; however, the pattern of information transmission was similar across groups. Taken together, results suggest that the performance difference between the two groups is primarily quantitative. The results underscore the importance of examining individuals' perception of individual phoneme features when attempting to relate speech perception to other predictor variables.

Adolescent↗
PubMed1990

Sound-producing sources as objects of perception: rate normalization and nonspeech perception.

In a variety of experiments and paradigms, researchers have attempted to determine whether or not speech perception is specialized by comparing perception of speech syllables to perception of nonspeech analogs. While nonspeech analogs appear optimal as comparisons to speech because they are acoustically similar without being recognized as speechlike, it is argued that the comparison they offer is confounded and uninterpretable. Two experiments are designed to show that, in auditory perception generally where acoustic signals are causal consequences of mechanical events, perceptual experiences are of the mechanical events themselves, not of the acoustic signal. This has two consequences. One is that there is a confounding in comparisons of speech with sine wave analogs that, whereas the one perceived as speech also has a definite causal source, the other, perceived as nonspeech, has an indeterminate or ambiguous source. A second is that response patterns in classification tasks such as those used in the literature comparing speech to nonspeech will reflect properties of the perceived sound-producing event; they will not provide a clear window on auditory system processes used to recover event properties. Experiment 3 is designed to show that perception of many acoustic-signal-producing events can appear to be special by the logic of speech-sine wave comparisons--even events that cannot plausibly be supposed to involve a specialization.

Adult↗
PubMed2002

Perceptions of competence, implicit theory of ability, perception of motivational climate, and achievement goals: a test of the trichotomous conceptualization of endorsement of achievement motivation in the physical education setting.

To test and extend the conceptualization of the endorsement of achievement goals in the physical education setting Mastery, Performance-approach, and Performance-approach goals, Perception of the physical education competence, Implicit theory about sport ability, and Perception of the motivational climate were assessed among 682 boys attending five French schools. Analysis indicated that (1) Performance-approach goals were positively associated with perception of physical education Competence, Entity beliefs about sport ability, the Performance dimension of the motivational climate, and negatively associated with Incremental beliefs about sport ability. (2) Mastery goals were positively associated with perception of physical education Competence, Incremental beliefs about sport ability, the Mastery dimension of the motivational climate, and negatively associated with the Performance dimension of the motivational climate. Also, (3) Performance-avoidance goals were positively associated with Entity beliefs about sport ability and the Performance dimension of the motivational climate; these goals were negatively associated with Incremental beliefs about sport ability and perception of physical education Competence. These results clearly attested to the validity of the trichotomous model in the physical education setting.

Achievement↗
PubMed2004

[A study of the perception of radiographic density with magnitude estimation: density perception of high-density areas].

To investigate proper radiographic contrast and latitude based on density perception of the high-density areas of X-ray films, we studied the human characteristics of darkness perception for those areas. Magnitude estimation was used to provide a numerical estimate of the sensory magnitudes for contrast. Experimental figures that imitated the head were imaged on X-ray films. Magnitude estimation of darkness in the surrounding fields showed greater misperception or darker perception. When the density of the background field was high, the larger the density difference between the background and surrounding field, the darker the surrounding field was perceived. This implies that the lighter field is assimilated into the darker field. Since assimilation reduces the perceived density difference between soft tissue and the area around it, using high contrast film is less effective for attempting to increase the physical density difference between such areas. We concluded that psychological assimilation of darkness on contrast perception had a detrimental influence on the density perception of high-density areas on head radiographs.

Humans↗
PubMed2000

Inertia tensor and weight-percept models of length perception by static holding.

S. J. Lederman, S. R. Ganeshan, and R. E. Ellis (1996) reported an experiment demonstrating that for occluded rods of equal mass and length but different diameters length perception by static holding was larger for rods of smaller diameter. They concluded that participants inferred length from illusory weight percepts. However, rods of equal mass and length that differ in diameter also differ in the eigenvalues of their respective inertia tensors. In the present experiments, the authors manipulated the diameters (Experiment 1) and the inertial eigenvalues (Experiments 4 and 5) of statically held objects. As has been shown with wielded objects, perceived length was a function of the eigenvalues. Additional experiments failed to confirm the expectation from the weight-percept model that perceived length maps to the estimated weight (Experiments 2 and 3). Physical quantities, not psychological quantities, seem to explain length perception by static holding.

Adult↗
PubMed2007

The role of perceptions of clinicians in their adoption of a web-based antibiotic approval system: do perceptions translate into actions?

PURPOSE: Computerized Decision Support Systems have been shown to improve clinicians' performance. Clinicians' adoption of these systems is crucial for their success. Studying clinicians' perceptions can provide an insight into the determinants of clinicians' adoption of such systems. The aim of this study was to measure clinicians' perceptions of ease of use and usefulness of a web-based antibiotic approval system, and to investigate the relationship between the reported perceptions and use of the system. METHODS: Potentially identifiable coded surveys were sent to a total of 70 senior and 150 junior medical staff, and 30 pharmacists all working at a tertiary care referral teaching hospital of Melbourne, Australia. Clinicians' perceptions of ease of use and usefulness of the antibiotic approval system; clinicians' general computer use; and clinicians' usage of the antibiotic approval system were measured. RESULTS: The overall response rate from the clinicians was 53.4%. The majority of the participants (70% and above) found it easy to obtain antibiotic approval using the system. More than 80% of the participants believed that the system will decrease the inappropriate use of antibiotics at the hospital. Clinicians who were more likely to use the system also found it easy to learn (Rho=0.392, p=0.001), easy to show others how to use the system (Rho=0.298, p=0.014), easy to find additional information (Rho=0.317, p=0.009), and easy to use it within their daily workflow (Rho=0.268, p=0.028). In addition, the clinicians were also more likely to use the system if they believed that it will improve their adherence to evidence-based practice (Rho=0.352, p=0.003). CONCLUSION: The majority of clinicians in an independent investigation of the antibiotic approval system found the system easy to use and useful to them. A number of clinicians' perceptions about the system were found to be correlated with the actual usage of the system by the clinicians.

Adult↗
PubMed2005

Physical activity and self-perception in school children assessed with the Children and Youth--Physical Self-Perception Profile.

AIM: This study validated the Swedish translation of the Children and Youth--Physical Self-Perception Profile (CY-PSPP) scale and examined the relation between physical self-perception and daily physical activity as well as the relationship between physical self-perception and body mass index (BMI) among Swedish school children. METHODS: Forty-eight children aged 11-12 years completed the CY-PSPP twice with 2 weeks in between. Test-retest reliability, concurrent and content validity were calculated. Five hundred and one children, aged 10-14 years, were measured for height and weight and perceived physical self-perception. Activity levels were analyzed using pedometers for 4 consecutive days. RESULTS: Good validity concerning concurrent and content validity was found. Test-retest reliability over a 2-week period was acceptable. In boys a fair and in girls a poor correlation between the sub-domains of the CY-PSPP and physical activity were found and a fair negative correlation between the sub-domains and BMI except for Physical Strength. CONCLUSION: The CY-PSPP distinguishes between children with low and high physical self-perception. The information is of importance when designing physical activity programs reachable for children with low physical self-esteem. According to the findings it is important to form physical activity programs that support and develop Sport Competence, Physical Condition and sense of Body Attractiveness among children.

Adolescent↗
PubMed1997

Visual motion perception after brain damage: II. Deficits in form-from-motion perception.

We investigated form-from-motion perception (FFM perception) in a sample of 39 patients with acquired brain damage. Pronounced FFM deficits were found in two patients (FM1 and FM2) with biparietal lesions. Both patients were able to identify the relevant figure, when it was not embedded in obstructive texture. Moreover, they could localize the figures in the FFM condition, although they could not reliably identify them. The two patients had normal motion coherence thresholds. Their performance in a static figure-ground task did not differ from that of other patients. These findings imply that the FFM deficits are not caused by impairment of basic visual motion or form perception but are the consequence of damage to a parietal brain structure involved in the combined analysis of visual motion and form information. The nature and functional role of this brain structure as well as the implications of our results for models of FFM perception are discussed.

Adult↗
PubMed2003

Language perception activates the hand motor cortex: implications for motor theories of speech perception.

The precise mechanisms of how speech may have developed are still unknown to a large extent. Gestures have proven a powerful concept for explaining how planning and analysing of motor acts could have evolved into verbal communication. According to this concept, development of an action-perception network allowed for coding and decoding of communicative gestures. These were manual or manual/articulatory in the beginning and then became increasingly elaborate in the articulatory mode. The theory predicts that listening to the 'gestures' that compose spoken language should activate an extended articulatory and manual action-perception network. To examine this hypothesis, we assessed the effects of language on cortical excitability of the hand muscle representation by transcranial magnetic stimulation. We found the hand motor system to be activated by linguistic tasks, most notably pure linguistic perception, but not by auditory or visuospatial processing. The amount of motor system activation was comparable in both hemispheres. Our data support the theory that language may have evolved within a general and bilateral action-perception network.

Adult↗
PubMed1997

Spatial perception during laparoscopy: implementing action-perception coupling.

Laparoscopy is a telepresence task since the surgeon has no direct contract with the patient. Performance of the surgeon will increase if his sense of telepresence is improved. This can be achieved by restoring the hampered action perception coupling. With respect to visual perception this means that the surgeon should be informed about the spatial lay-out of the environment; depth information and information about the location of observation. Both types of information can be provided by allowing the surgeon to explore. This paper describes our work on restoring the action perception coupling with respect to visual perception. It provides an overview of different technical solutions which balance between what information should be provided from an perceptual stand point and what information can be provided from a technical viewpoint.

Depth Perception↗
PubMed1989

How and what do autistic children see? Emotional, perceptive and social peculiarities reflected in more recent examinations of the visual perception and the process of observation in autistic children.

Autistic symptoms become apparent at the earliest during the 2nd-3rd month of life when the spontaneous registration of the meaning of specific-visual stimuli (eyes, configuration of the mother's face) do not occur and also learning experiences by reason of mimic and gestures repeatedly shown by the interaction partner can neither evoke a social smile nor stimulate anticipational behaviour. Even with increasing age an empathetic perception of feelings in the corresponding mimical gesticular formation is very difficult and they themselves are only insufficiently able to express their own feelings intelligibly to everyone. As mimic and gestures are, however, visually perceived, the autistic perceptive child's competence is of great importance. On the basis of the examinations of visual perception (retinal pathology, tunnel vision) perceptual processing (recognition of feelings, sex and age) and the disintegration of multimodal stimuli it can be presumed that social and emotional deficits are to be seen in connection with a deviant perceptive interpretation of the world and irregular processing on the basis of a neuro-biological handicap (the absence of a genetic determined reference-system for emotionally significant stimuli), which can have various causes (comp. Gillberg 1988) and also impede the adequate expression of feelings in mimic, gestures and voice. Autistic people see, experience and understand the world in a specific way in which and by which they differ from non-handicapped people.(ABSTRACT TRUNCATED AT 250 WORDS)

Affective Symptoms↗
PubMedDate not supplied

Parallels between perception without attention and perception without awareness.

Do studies of perception without awareness and studies of perception without attention address a similar underlying concept of awareness? To answer this question, we compared qualitative differences in performance across variations in stimulus quality (i.e., short vs. long prime-mask stimulus onset asynchrony) with qualitative differences in performance across variations in the direction of attention (i.e., focused vs. divided). The qualitative differences were based on three different phenomena: Stroop priming, false recognition, and exclusion failure. In all cases, variations in stimulus quality and variations in the direction of attention led to parallel findings. These results suggest that perception with and without awareness and perception with and without attention are equivalent ways of describing the same underlying process distinction.

Attention↗