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At least 721 records · Page 40Linked to original sources
PubMed2003

Stimulus control of cocaine self-administration.

Environmental stimuli that set the occasion wherein drugs are acquired can "trigger" drug-related behavior. Investigating the stimulus control of drug self-administration in laboratory animals should help us better understand this aspect of human drug abuse. Stimulus control of cocaine self-administration was generated here for the first time using multiple and chained schedules with short, frequently-alternating components--like those typically used to study food-maintained responding. The procedures and results are presented along with case histories to illustrate the strategies used to produce this stimulus control. All these multicomponent schedules contained variable-interval (VI) components as well as differential-reinforcement-of-other-behavior (DRO) or extinction components. Schedule parameters and unit dose were adjusted for each rat to produce stable, moderate rates in VI components, with minimal postreinforcement (infusion) pausing, and response cessation in extinction and DRO components. Whole-body drug levels on terminal baselines calculated retrospectively revealed that all rats maintained fairly stable drug levels (mean, 2.3 to 3.4 mg/kg) and molar rates of intake (approximately 6.0 mg/kg/hr). Within this range, no relation between local VI response rates and drug level was found. The stimulus control revealed in cumulative records was indistinguishable from that achieved with food under these schedules, suggesting that common mechanisms may underlie the control of cocaine- and food-maintained behavior.

Animals↗
PubMed2003

Discrimination of direction of movements in pigeons following previous experience of motion/static discrimination.

Two experiments examined pigeons' discrimination of directional movement using pictorial images shown on computer monitors. Stimuli consisted of the movement of a bird against a stationary background or the movement of the background behind a stationary bird. In Experiment 1, pigeons were trained to discriminate either leftward or rightward motion of either the bird or the background from stationary frames drawn from the same movies. The background-discrimination group acquired the discrimination faster than the bird-discrimination group. In Experiment 2, transfer of the discrimination from the task of Experiment 1 to a discrimination between motion directions was examined. Most of the pigeons learned this discrimination rapidly, whereas in a pilot study in which direction discrimination was trained without previous static/movement discrimination, learning was poor. It appears that an experimental history of movement against stationary discrimination promoted the pigeons' learning of the directional motion discrimination.

Animals↗
PubMed2006

Contingency discriminability and peak shift in concurrent schedules.

We investigated the effects of discriminative stimuli on choice in a highly variable environment using a procedure in which multiple two-key concurrent VI VI components changed every 10 reinforcers and were signaled by differential flashes of red and yellow keylights. Across conditions, five pigeons were exposed to a number of different combinations of the following component reinforcer ratios: 27:1, 9:1, 3:1, 1:1, 1:3, 1:9, 1:27. Overall, there was clear control by the component signals in that preference, early in components and particularly before any reinforcers had been delivered, was ordinally related to the signaled reinforcer ratios. In conditions in which only two components arranged unequal reinforcer ratios (e.g., 27:1 and 1:27) with the remaining components arranging 1:1 reinforcer ratios, preference before the first reinforcer in a component showed peak shift in that the most extreme preference did not occur in the unequal reinforcer-ratio components, but in 1:1 components further towards the ends of the stimulus dimension. The contingency-discriminability model (Davison & Nevin, 1999) was fitted to the data and provided an excellent description of the interactions between stimulus and reinforcer effects in a highly variable environment.

Animals↗
PubMedDate not supplied

The biomechanics of running. Implications for the prevention of foot injuries.

Understanding the biomechanics of running has brought implications for the prevention of foot injuries. These biomechanical considerations, both functional and non-functional, must be evaluated by the sports medicine practitioner. Although functional biomechanical findings are more accurate predictors of injury and diagnostic tools than static findings, a correlation between the two is essential. Other important variables, e.g. training methods, athletic shoes, psychology, general health, external environment (surfaces, weather) and overuse, must be correlated with the biomechanical findings. The methodology and results of research are inconsistent with the direct predictability of various overuse injuries, based on biomechanical abnormalities and/or contributing factors. Until more research is carried out, clinical experience and the results of structured research investigations will provide the basis of treatment.

Athletic Injuries↗
PubMed1994

Quality-of-life instruments in hypertension.

This review considers the choice of dimensions to be assessed and the practical problems of measuring quality of life in hypertensive patients. The dimensions of symptomatic well-being, psychological well-being, sleep, sexual function and cognitive function should be assessed. Symptomatic well-being may be measured by many different instruments, and that devised by the authors has been used extensively. The results in different trials may therefore be examined for consistency and sensitivity. Psychological well-being has been assessed by the Psychological General Well-Being Index, the Symptom Rating Test and the Profile of Mood States. The response of these instruments is discussed. The assessment of sleep, sexual function and cognitive function is also described. It is recommended that quality-of-life instruments to be employed in trials of antihypertensive drugs are known to be sensitive to the effects of such drugs.

Attitude to Health↗
PubMed2000

Optimism, satisfaction and time perspective in the elderly.

In contrast to younger groups, research with the elderly suggest a predominantly present-focused temporal orientation. One aspect of satisfaction, optimism is conceptualized as a form of future perspective. Health psychology generally asserts that health-enhancing messages depend for effect on a person perceiving future benefits to actions taken in the present to enhance health or minimize ill-health risk. The extent to which the elderly perceive or value the future should impact on health maintenance behaviors. In a study of eighty-six elderly people, the dominant ways of viewing time coalesced around a variety of present time perspectives. Within-group differences revealed that as people aged, they became less satisfied with life relative to their level of optimism. For the young-old, optimism was positively correlated with satisfaction, but for the oldest-old the variables were negatively associated. Optimism increased with age while satisfaction decreased with age. The decrease in satisfaction is most probably related more to a sense of realism about the tasks of aging than a sense of "death anxiety," or avoidance of the future. As people age, temporal variables become less important in predicting optimism or satisfaction and optimism becomes less important as a predictor of satisfaction. Implications for developing models of health management in the elderly are discussed.

Aged↗
PubMed1993

Identifying the best scenario for using schematic organizers as integration tools for alcohol-related information.

The goal of the present study was to examine scenarios for using two schematic organizers--schematic knowledge maps and conceptual matrices--in integrating episodic and semantic knowledge about alcohol. Seventy students from undergraduate general psychology classes participated for course credit. Participants were assigned to either a schematic organizer group or an essay writing group. These groups were subdivided further into two treatment sequences: episodic/semantic and semantic/episodic. The episodic activity required participants to complete materials using their own alcohol-related experiences, whereas the semantic activity required participants to annotate expert materials. Assessment measures used were consumer-satisfaction questionnaires and free-recall tests. While no preferences were established for any one scenario, the episodic activities were rated higher than the semantic activities regardless of integration sequence. The semantic/episodic integration scenario did produce higher recall scores for the expert information.

Adult↗
PubMed1979

Job alienation and well-being.

This paper analyzes the relationships between alienation conceived as monotonous, repetitive work and alienation as job-worker incongruence to a variety of measures of worker as well-being among a population of workers from Victoria, British Columbia. The data show weak relationships between work perceived as monotonous and general psychological and physical well-being and between alienation as job-worker incongruence and health. While weak in variance-explained terms, the relationships show the predicted patterns are robust and are independent of a large number of control variables. Percentage differences in well-being between the alienated and nonalienated workers are fairly substantial. Some societal implications of the findings are discussed.

Adult↗
PubMed1998

Multidimensional correlates of falls in older women.

Older women who had fallen within the last year (n = 63) were compared with those who had not fallen (n = 67) on several psychological and motor measures. Both fallers and nonfallers demonstrated high levels of functioning. Discriminant analysis results indicated that a combination of variables, including physical activity and both psychological (general well-being, self-efficacy) and motor (functional reach, mobility) measures differentiated fallers and nonfallers. Results suggest that falling is a multidimensional phenomenon, that small declines on multiple factors may increase risk of falls, and that multifaceted interventions may help maintain high levels of functioning and prevent declines often associated with increased age.

Accidental Falls↗
PubMed2001

Contributors to depression in Latino and European-American patients with type 2 diabetes.

OBJECTIVE: To determine the independent and cumulative contributions of diabetes and other life stresses on depression and anxiety in Latino and European-American (EA) patients with diabetes. RESEARCH DESIGN AND METHODS: A total of 75 Latino and 113 EA patients with type 2 diabetes, recruited from managed care settings, were assessed regarding three groups of potential stresses: demographics (age, sex, and education), disease status (functional impact, time since diagnosis, comorbidities, HbA(1c), and BMI), and family stress (financial stress, spouse conflict resolution, and family closeness). Dependent variables were depression (Center for Epidemiological Studies-Depression scale [CES-D]) and anxiety (Symptom Checklist [SCL-90]). Multiple regression equations assessed the independent contribution of each predictor on depression and anxiety. RESULTS: For both ethnic groups, education, functional impact, and financial stress significantly and independently predicted depression; poor spouse conflict resolution was a fourth significant predictor for EA patients only. The equations accounted for a high percentage of variance (43- 55%). Excluding education, the same variables predicted anxiety for both ethnic groups. The disease status and family stress variable groups significantly predicted outcomes independently. The relationships among these variables and depression and anxiety generally occurred for all patients, not only for those classified as likely depressed. CONCLUSIONS: The findings suggest the utility of considering many life stresses, not just diabetes alone, that combine to affect depression and anxiety. We suggest that these effects are experienced cumulatively as general psychological distress for all patients with diabetes, not just those classified as likely depressed. Taken together, the findings emphasize a life-centered, patient-focused approach to the treatment of depression, rather than an exclusive disease-related perspective.

Adult↗
PubMed2006

Depiction of an object's size in drawings subsequent to interaction with the object.

Subsequent representation of the size of the object in a visuomotor activity was evaluated after an object was used differentially in two ways. 25 female and 17 male students volunteered from general psychology courses and were randomly assigned to a condition in which participants used a small teaspoon to remove sand from a ladle or simply moved the ladle. Those who removed sand drew a representation of a ladle that was taller than did participants who moved the ladle. It appears, given the time-consuming activity of removing sand, the ladle appeared to contain more sand and seemed larger. Findings suggest that the way an object was used may distort memory of its size and that subsequent representation of the size in a visuomotor task can be influenced by that memory.

Adult↗
PubMed1975

Contrast effects in the response to art.

Slides of traditional and abstract paintings were rated for either preference or complexity by 120 Ss following their earlier exposure to a contrasting series of slides of another type of art. Traditional art was liked more when it followed abstract art than when it was viewed after its own type of art. Abstract art, on the other hand, was liked less when it followed traditional art than when it followed the same type of art. Complexity judgments for both types of art, compared to their ratings without an earlier contrasting series, increased after seeing another type of art, although traditional art increased more than abstract art did. These findings were related to several theoretical approaches to cognition, general psychology, aesthetics, and the practical problems of art education. The research also illustrated that the humanistic content of experimental psychology can be broadened by including aesthetics and that experimental aesthetics can be liberalized by using slides showing real art.

Art↗
PubMed2001

Perception of time: variations in verbal content and delay of estimation.

Delay of time estimation results in consistently longer judgments than immediate estimation, yet confirmatory studies have relied primarily on numerical digits for interpolated material as shown, for example, by Vitulli and Rowe in 1999. The present study used three paragraphs audiotaped from a 1998 textbook in general psychology by Baron as stimuli presented for judgment of the passage of time. Among 218 undergraduate volunteers delay of estimation produced significantly longer judgments regardless of the verbal passage, and short-term memory scores varied as a function of content.

Adult↗
PubMed2003

Self-monitoring, need for cognition, and the Stroop effect: a preliminary study.

The color-word Stroop task requires an individual to ignore one piece of information (word) while responding to another (color). Since self-monitors are good at adapting their responses to fit a situation and those high in need for cognition carefully think through information before responding, this study explored the relationship between self-monitoring and need for cognition using Stroop interference. It was anticipated that self-monitoring would reduce Stroop interference, while need for cognition would increase Stroop interference. 23 General Psychology students (10 men, 13 women, M(age) = 18.8 yr.) participated. Participants were given the Self-monitoring Scale, the Need for Cognition Scale, and the Stroop Color-Word Test. Analysis indicated that Need for Cognition was not correlated with Stroop interference (r = .31) but higher scores on Self-monitoring were correlated with lower Stroop interference (r = .43). Implications for research are suggested.

Adolescent↗
PubMed2003

Interest and attention in facial recognition.

When applied to facial recognition, the levels of processing paradigm has yielded consistent results: faces processed in deep conditions are recognized better than faces processed under shallow conditions. However, there are multiple explanations for this occurrence. The own-race advantage in facial recognition, the tendency to recognize faces from one's own race better than faces from another race, is also consistently shown but not clearly explained. This study was designed to test the hypothesis that the levels of processing findings in facial recognition are a result of interest and attention, not differences in processing. This hypothesis was tested for both own and other faces with 105 Caucasian general psychology students. Levels of processing was manipulated as a between-subjects variable; students were asked to answer one of four types of study questions, e.g., "deep" or "shallow" processing questions, while viewing the study faces. Students' recognition of a subset of previously presented Caucasian and African-American faces from a test-set with an equal number of distractor faces was tested. They indicated their interest in and attention to the task. The typical levels of processing effect was observed with better recognition performance in the deep conditions than in the shallow conditions for both own- and other-race faces. The typical own-race advantage was also observed regardless of level of processing condition. For both own- and other-race faces, level of processing explained a significant portion of the recognition variance above and beyond what was explained by interest in and attention to the task.

Adult↗
PubMed2003

A systematic replication of variations in verbal content and delay on time estimation and short-term memory.

Vitulli and Nemeth reported in 2001 that among 218 undergraduate volunteers delay of estimation produced significantly longer judgments of time regardless of the verbal passage while short-term memory scores varied as a function of verbal content. In this systematic replication 112 volunteers used three paragraphs audiotaped from a 1998 textbook in general psychology by Baron as stimuli presented for judgment of the passage of time and for short-term memory tests. Addition of control conditions using as stimuli nonsense syllables equal in duration to the three paragraphs did not have an effect contrary to past studies. Yet post hoc tests with nonsense-syllable data removed showed significance between immediate and delayed time estimations consistent with past studies, suggesting boundary conditions for this historically robust effect. Length of segment resulted in significantly different estimations of time as expected. An interaction of short-term memory scores between delay of estimation and content of verbal material showed short-term memory scores were significant between paragraphs and for delay of test (immediate versus delayed).

Adult↗