Acquisition and maintenance of delayed matching-to-sample in tufted capuchin monkeys

Delayed matching-to-sample (DMTS) is a commonly used procedure to investigate short-term memory. For the study of functions of forgetting, the delay between the disappearance of the sample stimulus and appearance of choices is manipulated. The intertrial interval (ITI) is also varied to assess interference effects. Performance decrements have been observed as delay increases and, in some cases, performance recovery occurs when ITIs are increased. Other studies indicate that the higher the ITI/delay ratio, the greater the accuracy in DMTS. In this study, 2 experiments investigated DMTS performances of 3 tufted capuchin monkeys as function of delay and ITI. In Experiment 1, alternation of gradual increases of delay and ITI was effective in producing ≥90% accuracy at delays as long as 90 s. Individual monkeys differed in the highest value of delay at which this criterion was met. In Experiment 2, the monkeys were exposed to 5-s DMTS with different ITIs to assess the effects of various ITI/delay ratios on accuracy. Highest accuracy tended to occur at the higher ITI/delay ratios.     

Gait and risk of falls associated with frontal cognitive functions at different stages of Alzheimer's disease

ABSTRACT

The decline in frontal cognitive functions contributes to alterations of gait and increases the risk of falls in patients with dementia, a category which included Alzheimer's disease (AD). The objective of the present study was to compare the gait parameters and the risk of falls among patients at different stages of AD, and to relate these variables with cognitive functions. This is a cross-sectional study with 23 patients with mild and moderate AD. The Clinical Dementia Rating was used to classify the dementia severity. The kinematic parameters of gait (cadence, stride length, and stride speed) were analyzed under two conditions: (a) single task (free gait) and (b) dual task (walking and counting down). The risk of falls was evaluated using the Timed Up-and-Go test. The frontal cognitive functions were evaluated using the Frontal Assessment Battery (FAB), the Clock Drawing Test (CDT) and the Symbol Search Subtest. The patients who were at the moderate stage suffered reduced performance in their stride length and stride speed in the single task and had made more counting errors in the dual task and still had a higher fall risk. Both the mild and the moderate patients exhibited significant decreases in stride length, stride speed and cadence in the dual task. Was detected a significant correlation between CDT, FAB, and stride speed in the dual task condition. We also found a significant correlation between subtest Similarities, FAB and cadence in the dual task condition. The dual task produced changes in the kinematic parameters of gait for the mild and moderate AD patients and the gait alterations are related to frontal cognitive functions, particularly executive functions.     

Hand gestures and perceived influence in small group interaction

A laboratory study was carried out to establish the relative importance of verbal and gestural behavior, as well as their interaction, for perceived social influence in more or less competitive small groups. Forty women (psychology students) participated in leaderless small group discussions of different sizes (four-member and eight-member): at the end, each member rated the perceived influence in decision-making of every other member. Verbal dominance coding is based on traditional quantitative conversational dominance (number of talk turns). Gestural coding (conversational, ideational, object-adaptor, self-adaptor gestures) is based on classical gesture classifications. Beside a substantial effect of verbal dominance, the main result is that frequency of object-adaptors and conversational (only in large groups) and ideational (in both small and large groups) gestures increases perceived influence scores particularly when the verbal dominance of the speaker is low.     

Beyond Collaboration: Embodied Teacher Learning and the Discourse of Collaboration in Education Reform

In this paper I highlight the significance of Maurice Merleau-Ponty??s contribution to the study of teacher learning. I particularly draw on his notion of embodiment to show that professional knowledge is embodied knowledge and that teachers make sense of their professional world through their embodied action. I contrast my interpretation with a professional learning model that has been influential in Canada, the US, the UK, Australia and other countries. I suggest that policy makers interested in education reform initiatives would benefit from interrogating the nature of professional practices in education.     

The Development of Identity. A Critical Analysis from the Perspective of the Self as Subject

In this paper an argument is presented, suggesting that the concept of identity articulated by Erikson and reflected in ordinary pretheoretical understanding includes, as a central feature, a special experience of self, namely, the experience of a unified psychological "essence," from which superficial characteristics of the person are differentiated. However, as is shown through a close analysis of various identity measures, this subjective experiential aspect is typically neglected in identity research, including the many studies that were guided by the identity status paradigm. A new approach is then presented, aimed at recapturing the subjective meaning of identity, by viewing identity as a modality of the self as subject and as characterized by specific experiences of agency, unity, otherness, and individuality. In an effort to empirically ground this approach, a typology of identity experience, derived from Loevinger′s ego development stages, is described. Several studies are then reviewed, that confirm the viability of this typology and illustrate the advantages of studying identity from the perspective of the self as subject.     

Fenomenologia,coscienza del tempo e analisi musicale

This paper explores the relationships between American phenomenology of music and conventional studies of musical analysis. The temporality of experience is a central topic in the phenomenology of music: recent research in USA has focused on musical time-consciousness (Schutz and Smith) or on analytical applications (Clifton, Lochhead, Ferrara). Many methods of musical analysis, like phenomenological methods, are concerned to study subjective temporal structures: Schenkerian and post-Schenkerian scholars (Salzer, Meyer, Narmour, Lewin) have elaborated specific systems for the explanation of musical form on a experiential basis. Apart from any comparison with the different approaches, phenomenological analysis appears to be fundamental for the analytical interpretation of music.     

Drug addicts in therapy—changes in life space in the course of one year

In a residential community treatment setting, moods and emotional states of drug addicts were explored over a 1‐year period. The specific form of treatment of heroin addiction employed in the communities is based on the importance of interpersonal relationships for psychosocial transition. Twenty‐nine participants reported current mood, emotions, attributions, and motive activation using a time‐sampling diary for 2 weeks at the beginning of the treatment, and 6 and 12 months later. Results show an increase in positive emotions, and in subjective strength and freedom. Furthermore, participants report higher self‐esteem and use less fatalistic attributions. This is interpreted as indicating successful transition processes in terms of higher autonomy, a more extended life space and increased levels of realism. Copyright © 2002 John Wiley & Sons, Ltd.