Interference in immediate spatial memory

It has been suggested that maintenance in visuospatial immediate memory involves implicit motor processes that are analogous to the articulatory loop in verbal memory. An alternative account, which is explored here, is that maintenance is based on shifts of spatial attention. In four experiments, subjects recalled spatial memory span items after an interval, and in a fifth experiment, digit span was recalled after an interval. The tasks carried out during the interval included touching visual targets, repeating heard words, listening to tones from spatially sepa-rated locations, pointing to these tones, pointing to visual targets, and categorizing spatial tar-gets as being from the left or right. Spatial span recall was impaired if subjects saw visual tar-gets or heard tones, and this impairment was increased if either a motor response or a categorical response was made. Repeating words heard in different spatial locations did not impair recall, but reading visually presented words did interfere. For digit span only, the tasks involving a verbal response impaired recall. The results are interpreted within a framework in which active spatial attention is involved in maintaining spatial items in order in memory, and is interfered with by any task (visual, auditory, perceptual, motor) that also makes demands on spatial attention.     

Personality and spirituality: comparative TATs of high-achieving Rajneeshees

The Thematic Apperception Test (TAT) was administered to followers of Bhagwan Shree Rajneesh in their commune in central Oregon. The Rajneeshee subjects had been high achievers (with advanced degrees and/or previous incomes greater than 30,000 dollars in 1984 dollars). Later, TATs were administered to persons matched for gender, age, education, and occupation but not involved in new religions. The final matched sample included 24 men and 20 women, half of whom were Rajneeshees. TATs were coded for a variety of formal variables as well as personality ratings. Though the analysis showed no between-group differences on most variables, significant mean differences occurred on ratings of unusual conditions, quest, and narcissism, with Rajneeshees higher than comparison subjects. Gender differences in personality variables were not conspicuous. Factor analysis established a strong productivity element. Card 16 (the blank card) provided the greatest number of differences.     

Vision and proprioception in simple catching

Articular proprioception is normally considered to provide accurate information about limb position, particularly in ball skills in which the eyes are be occupied with tracking the ball. If this is so, then preventing sight of the catching hand without interfering with visual tracking of the ball should affect the accuracy of catching. The experiment reported here indicates that is not the case. Catching is much less accurate if the hand cannot be seen. The errors made are in positioning of the catching hand, which frequently does not contact the ball. In addition, subjects showed larger changes in the felt length arms after catching without sight of the hand than did those who could hand while catching. Visual information about the position of the hand for catching, and this may be because the proprioceptive system is by vision.     

Juror Responses to Direct and Mediated Presentations of Expert Testimony1

One hundred twenty-one King County (Washington) jurors viewed one of four videotaped versions of medical testimony relevant to the determination of a claim for damages against an employer in an industrial accident case. Two versions presented the claimant's physician (direct testimony), and two presented an attorney reading the physician's testimony verbatim (mediated testimony). Two professional actors (one female, one male) portrayed the physician in one version and the attorney in the other. Videotape presentations were introduced by written material and followed by a questionnaire in which Ss answered a number of legal, attitudinal, and factual questions. Responses to direct testimony differed from those to mediated testimony on several dimensions: number of items listed as significant to the determination of a cash award, estimates of sufficiency of material presented to determine an award, estimates of physician's competence, estimates of confidence in ratings of physician's competence, and number of correct items in a factual retention test. Significant correlations were found between scores on some of these dimensions and number of dollars awarded as compensation. Differences between the actors produced no significant effects, nor were there any significant interactions. It is concluded that, ceteris paribus, direct testimony is to be preferred to mediated testimony.     

Phonological encoding in the silent speech of persons who stutter

The purpose of the present study was to investigate the role of phonological encoding in the silent speech of persons who stutter (PWS) and persons who do not stutter (PNS). Participants were 10 PWS (M=30.4 years, S.D.=7.8), matched in age, gender, and handedness with 11 PNS (M=30.1 years, S.D.=7.8). Each participant performed five tasks: a familiarization task, an overt picture naming task, a task of self-monitoring target phonemes during concurrent silent picture naming, a task of monitoring target pure tones in aurally presented tonal sequences, and a simple motor task requiring finger button clicks in response to an auditory tone. Results indicated that PWS were significantly slower in phoneme monitoring compared to PNS. No significant between-group differences were present for response speed during the auditory monitoring, picture naming or simple motor tasks, nor did the two groups differ for percent errors in any of the experimental tasks. The findings were interpreted to suggest a specific deficiency at the level of phonological monitoring, rather than a general monitoring, reaction time or auditory monitoring deficit in PWS. Educational objectives: As a result of this activity, the participant should: (1) identify and assess the literature on phonological encoding skills in PWS, (2) enumerate and evaluate some major psycholinguistic theories of stuttering, and (3) describe the mechanism by which defective phonological encoding can disrupt fluent speech production.     

Event-related potential (ERP) indices of infants' recognition of familiar and unfamiliar objects in two and three dimensions

We measured infants' recognition of familiar and unfamiliar 3-D objects and their 2-D representations using event-related potentials (ERPs). Infants differentiated familiar from unfamiliar objects when viewing them in both two and three dimensions. However, differentiation between the familiar and novel objects occurred more quickly when infants viewed the object in 3-D than when they viewed 2-D representations. The results are discussed with respect to infants' recognition abilities and their understanding of real objects and representations. This is the first study using 3-D objects in conjunction with ERPs in infants, and it introduces an interesting new methodology for assessing infants' electrophysiological responses to real objects.     

Stress-related cognitive interference predicts cognitive function in old age

Both subjective distress and cognitive interference have been proposed as mechanisms underlying the negative effects of stress on cognition. Studies of aging have shown that distress is associated with lower cognitive performance, but none have examined the effects of cognitive interference. One hundred eleven older adults (M-sub(age)=80) completed measures of working memory, processing speed, and episodic memory as well as self-report measures of subjective distress and cognitive interference. Cognitive interference was strongly associated with poorer performance on all 3 cognitive constructs, whereas distress was only modestly associated with lower working memory. The results suggest that cognitive process related to stress is an important predictor of cognitive function in advanced age.     

Verbal coding and the storage of form-position associations in visual-spatial short-term memory

Short-term memory for form-position associations was assessed using an object relocation task. Participants attempted to remember the positions of either three or five Japanese Kanji characters, presented on a computer monitor. Following a short blank interval, participants were presented with 2 alternative Kanji, only 1 of which was present in the initial stimulus, and the set of locations occupied in the initial stimulus. They attempted to select the correct item and relocate it back to its original position. The proportion of correct item selections showed effects of both articulatory suppression and memory load. In contrast, the conditional probability of location given a correct item selection showed an effect of load but no effect of suppression. These results are consistent with the proposal that access to visual memory is aided by verbal recoding, but that there is no verbal contribution to memory for the association between form and position.     

The relationships between television viewing in midlife and the development of Alzheimer's disease in a case-control study

The relationship between leisure activities and development of cognitive impairment in aging has been the subject of recent research. We examined television viewing in association with risk of developing Alzheimer's disease (AD) in a case-control study. Given recent focus on the importance of intellectually stimulating activities as preventive measures against cognitive decline, it is important to examine the effects of less stimulating but common activities. Data are from 135 Alzheimer's disease cases and 331 healthy controls. Demographic characteristics and life history questionnaire responses on the number of hours spent on 26 leisure activities during middle-adulthood (ages 40-59) were analyzed. Logistic regression was used to examine the effects of middle-adulthood leisure activities on case vs. control status. Results indicate that for each additional daily hour of middle-adulthood television viewing the associated risk of AD development, controlling for year of birth, gender, income, and education, increased 1.3 times. Participation in intellectually stimulating activities and social activities reduced the associated risk of developing AD. Findings are consistent with the view that participation in non-intellectually stimulating activities is associated with increased risk of developing AD, and suggest television viewing may be a marker of reduced participation in intellectually stimulating activities.     

The effect of school environment on body concerns in adolescent women

The study investigated body figure preferences, eating disorder symptomology, and role concerns in 142 Australian caucasian adolescent girls in two different school environments, both of medium to high socioeconomic status. Girls at a private single-sex school nominated a thinner ideal figure and displayed more eating disorder patterns than their counterparts at a private coeducational school. Although the schools did not differ in role concerns, these had a differential impact on prediction of the ideal figure. In particular, the importance placed on professional success predicted the choice of ideal figure for the single-sex but not for the coeducational school. It was concluded that what motivates the wish for thinness differed between the schools.