Color Vision in Alzheimer’s Patients: Can We Improve Object Recognition With Color Cues?

Sixty-three frail, elderly patients seen in a university-based outpatient geriatric assessment clinic were divided into three dementia diagnosis categories (Alzheimer’s disease, “other” dementias, cognitively intact) to investigate the use of color cues as memory aids. Recognition time was measured for three cues: (1) same color/different form; (2) same form/different color; and (3) different color/different form. Log transformed response times were longer for form cues (same color/different form) compared to color cues (different color/same form, p =.001; different color/different form, p <.001). No differences in log transformed response time were noted among dementia categories for each test condition. Color cues make a significant difference in short-term memory recall ability compared to form cues. Vivid color-coding the environment of a frail, elderly population may enhance short-term memory and improve functional ability. This may prove to be especially useful in long-term care settings, which provide services to a variety of people with differing cognitive abilities.     

BRIEF EXPERIMENTAL ANALYSIS OF STIMULUS PROMPTS FOR ACCURATE RESPONDING ON ACADEMIC TASKS IN AN OUTPATIENT CLINIC

Brief multielement designs were used to examine the effects of specific instructional strategies on accuracy of academic performance during outpatient evaluations of 4 children with learning disorders. Instructional strategies that improved accuracy on academic tasks were identified for all participants. These results suggest that the application of experimental analysis methodologies to instructional variables may facilitate the identification of stimulus prompts that are associated with enhanced academic performance.     

Methylphenidate in hyperactive children: Differential effects of dose on academic,learning, and social behavior

Methylphenidate (Ritalin) has been shown to have differential effects on hyperactive children's behavior as a function of dose level. In the present investigation, a triple-blind, placebo-control, within-subject (crossover) experimental design was employed in which 12 hyperactive boys between 6 and 10 years received three different dosages of methylphenidate (5, 10, and 15 mg) in a randomly assigned sequence. Dosage effects were assessed on clinic(PAL-Paired Associates Learning test) and school-(percent on task, teacher ratings, work completion rates, and accuracy) related behaviors. For 10 of the children, classified as responders to medication by the PAL using the criteria of Swanson, Kinsbourne, and colleagues, a series of ANCOVAs with repeated measures showed significant dosage effects on teacher ratings (p 01), percent on task (p 01), academic accuracy (p 05), and assignment completion rates (p 05). PAL performance was also significantly enhanced (p 01) after optimal dose levels were considered. Subsequent trend analysis showed a significant positive linear relationship between dose and each of the dependent variables. A comparison of fixed-dose and miligram-per-kilogram plots showed that children's performance across the different dosages were clearly individualistic and task-specific, even when similar body weights were compared. The implications of using clinic-based testing to determine optimal medication responsivity were discussed.We would like to express our sincere appreciation to the following pediatricians for their valuable assistance: W. H. McDermott, D. J. Chronley, R. B. Trivett, F. J. Jehle, P. M. Small, and F. T. Leong. Grateful acknowledgement is also extended to the two anonymous reviewers whose comments contributed to the content of this paper, and to the undergraduate and graduate student members of the Children's Learning Clinic.     

EFFECTS OF ALCOHOL INTOXICATION AND VICTIMIZATION HISTORY ON WOMEN'S SEXUAL ASSAULT RESISTANCE INTENTIONS: THE ROLE OF SECONDARY COGNITIVE APPRAISALS

This study used an experimental paradigm to investigate the role of secondary cognitive appraisals in women's sexual assault resistance and whether these appraisals mediated influences of alcohol and prior victimization. After consuming a beverage (control, placebo, moderate, or high dose), 351 women projected themselves into a simulated interaction with a sexually aggressive man. Four types of secondary appraisals (shock at the man's behavior, concern about his feelings, uncertainty in the situation, conflict about what to do) and three resistance strategies (assertive, polite, passive) were examined. Path modeling revealed that, as expected, intoxication and prior sexual victimization influenced secondary appraisals, which in turn influenced intended resistance. Prior adult sexual assault (ASA) and childhood sexual abuse (CSA) also had direct effects: ASA negatively predicted assertive resistance and CSA positively predicted passivity. Findings suggest that secondary appraisals are key targets for intervention to facilitate effective resistance, thereby reducing the risk of adult sexual victimization.     

Psychopathology of incarcerated sex offenders

The psychopathology and particularly the personality disorders of sex offenders were compared to general inmates of the Colorado Department of Corrections. Using the MCMI-III (Millon, 1994, 1997), sex offenders in general were found to have more varied types of personalities than general population inmates. Specifically, they were more schizoid, avoidant, depressive, dependent, self-defeating, and schizotypal. General population inmates had the more classically criminal personality characteristics of antisocial, narcissistic, and sadistic. Multivariate analysis showed the Dependent, Narcissistic, Antisocial, and Schizotypal scales to be the most differentiating. Sex offenders were also found to have more affective psychopathology such as anxiety, dysthymia, PTSD, and major depression. A similar trend was found when comparing child molesters to rapists. The child molesters were more neurotic, affective, and socially impaired than the rapists. Multivariate analysis showed the Dependent scale to be the most important in differentiating these two types of sex offenders.     

THE UTILITY OF CURRICULUM-BASED MEASUREMENT FOR EVALUATING THE EFFECTS OF METHYLPHENIDATE ON ACADEMIC PERFORMANCE

Two case studies were conducted to investigate the utility of curriculum-based measurement of math and reading for evaluating the effects of methylphenidate on the academic performance of 2 students diagnosed with attention deficit hyperactivity disorder. Following baseline measurement, double-blind placebo-controlled procedures were employed to evaluate each student's response to three levels (5 mg, 10 mg, and 15 mg) of the medication. Results of the first study suggest that the curriculum-based measures were sensitive indicators of the student's response to medication. This finding was replicated in the second study. In the second study, when the student's follow-up dose of medication was based on trial-phase data, follow-up performance was improved compared to baseline performance. These case studies suggest that further research is warranted on the utility of curriculum-based measurements for monitoring and evaluating stimulant medication interventions with children with this disorder.     

Test-retest reliability of the Hand Test with normal subjects

The Hand Test (Wagner, 1962) was administered to 71 subjects; 14 days later these subjects were again administered the Hand Test. Results indicated the Hand Test is a highly reliable measure of an individual's behavioral action tendencies.     

Context and the motion aftereffect: occlusion cues in the test pattern alter perceived direction

A horizontally moving vertical grating viewed through a diamond-shaped aperture can be made to appear to move either upwards or downwards by introduction of appropriate depth-ordering cues at the boundaries of the aperture (Duncan et al. 2000 Journal of Neuroscience 20 5885-5897). The grating is perceived to move towards (and sliding under) occluding 'near' surfaces, and parallel to 'far' surfaces. Here we show that these depth-ordering cues affect the perceptual interpretation of the motion aftereffect (MAE) as well. After adaptation to unambiguous horizontal motion, the MAE direction deviates from horizontal towards near surfaces. However, the influence of depth-ordering cues on the illusory motion of the MAE is generally less than that seen for 'real' motion. Implications for theories of depth-motion and depth-MAE interactions are discussed.     

Fanciful Examples

This article defends the use of fanciful examples within the method of wide reflective equilibrium. First, it characterizes the general persuasive role of described cases within that method. Second, it suggests three criteria any example must meet in order to succeed in this persuasive role; fancifulness has little or nothing to do with whether an example is able to meet these criteria. Third, it discusses several general objections to fanciful examples and concludes that they are objections to the abuse of described cases; they identify no special problem with fanciful examples.