Biomechanics of normal and pathological gait: implications for understanding human locomotor control

The biomechanical (kinetic) analysis of human gait reveals the integrated and detailed motor patterns that are essential in pinpointing the abnormal patterns in pathological gait. In a similar manner, these motor patterns (moments, powers, and EMGs) can be used to identify synergies and to validate theories of CNS control. Based on kinetic and EMG patterns for a wide range of normal subjects and cadences, evidence is presented that both supports and negates the central pattern generator theory of locomotion. Adaptive motor patterns that are evident in peripheral gait pathologies reinforce a strong peripheral rather than a central control. Finally, a three-component subtask theory of human gait is presented and is supported by reference to the motor patterns seen in a normal gait. The identified subtasks are (a) support (against collapse during stance); (b) dynamic balance of the upper body, also during stance; and (c) feedforward control of the foot trajectory to achieve safe ground clearance and a gentle heel contact.     

The psychoanalyst's normal and pathological superegos

The first section of the paper explores a number of differing views regarding the concept of the superego, essentially in terms of its formation and its functions. Two broad theories of superego development, both of which were introduced by Freud, are described. The first takes the superego to be principally oedipal in origin; the second traces the superego to an earlier period. The controversy about the usefulness of the concept of the death instinct is also implicated in the different views. It is then suggested that it is worthwhile to distinguish between a normal superego and a pathological superego and that these two distinct models of the superego are implicit in the work of both Freud and Klein. Strachey's (1934) views on the nature of the mutative effect of psychoanalytic treatment are briefly reviewed in the light of this distinction. It is suggested that Strachey was hesitant in clarifying the full implications of his views, particularly regarding the reasons for the difficulty the psychoanalyst will experience in making a transference interpretation. It is argued that the difficulty will relate to the psychoanalyst's anxiety about having sufficiently worked through the countertransference, particularly in relation to superego functioning. Two brief clinical vignettes are considered in support of this view. The last section of the paper offers some comments on the emotional development of the psychoanalyst and the ways that maturing as a psychoanalyst will involve a certain mellowing of the analyst's stance and a greater tolerance of the patient's prerogative to bring the full range of his or her personality into the treatment.     

ePortfolio as a tool for reflection and self-reflection

The request and promotion of reflection begins with an analysis of one’s own understanding of education and learning as well as the connection of reflection and self-reflection and the competence development of students. A self-reflective attitude should be promoted early on by encouraging students to understand (reflection), to evaluate (evaluation), and, if necessary, to adapt (regulation) their own learning behavior. To encourage reflection, self-reflection, and competence development, the use of an ePortfolio can provide a valuable contribution. However, the implementation process of an ePortfolio for pre-service teachers remains a debated method. This research paper investigates the impact and sustainability of an ePortfolio-implementation regarding students’ competence development and reflection skills in a Master’s Program for Business Education and Development (BED). The survey was conducted between October 2011 and June 2014 (n = 811) and consists of six sequential questionnaires. The students assessed the positive impact on their (self-)reflection. When being asked about their most distinctive competences, students’ responses emphasize their previous ePortfolio-sessions, thus indicating a positive impact of the ePortfolio on students’ self-perceived competences.     

Performance and activity of hyperactive and normal boys as a function of distraction and reward

Twenty-five hyperactive boys and 25 controls matched for age, social class, and race were compared on three performance tasks (coding, tone discrimination, and connecting dots) in two settings (nondistracting and highly distracting). Control Ss performed significantly better than did hyperactives in all conditions, except during tone discrimination and connecting dots in the nondistracting setting. Distraction decreased performance for both groups on the coding task and for hyperactives on the tone discrimination task, but significantly improved performance for controls on the connecting dots task. Distraction, where detrimental, was not significantly more so for hyperactives than for controls. The effect of reward on coding performance was studied in the distracting condition; reward produced the best performance for both groups, but significant differences between groups were not found.This research was supported in part by U.S. Public Health Service Training Grant (in Biological Sciences) No. MH07081.The participation of the following people in helping to design this research study and collect data is hereby acknowledged: David Bremer, Ted Goltz, Ruth Rosenthal, and Michael Stern.     

Decoding human brain activity during real-world experiences

The human brain evolved to function and survive in a highly stimulating, complex and fast-changing world. Attempting to ascertain the neural substrates of operating in naturalistic contexts represents a huge challenge. Recently, however, researchers have begun to use several innovative analysis methods to interrogate functional magnetic resonance imaging (fMRI) data collected during dynamic naturalistic tasks. Central to these new developments is the inventive approach taken to segregating neural activity linked to specific events within the overall continuous stream of complex stimulation. In this review, we discuss the recent literature, detailing the key studies and their methods. These analytical techniques can be applied in a wide range of cognitive domains and, thus, offer exciting new opportunities for gaining insights into the brain bases of thoughts and behaviours in the real-world setting where they normally occur.     

The EMG gradient as a reflection of metamotivational state

The significance of motivational statedominance in everyday life and actual motivational state during task performance was investigated in relation to skeletal muscle tension patterns during performance in the continuous preceptual-motor task paradigm. Subjects were recruited to form seriousminded (telic) and playful (paratelic) extreme groups according to their responses to the Telic Dominance Scale (6 subjects in each group). They all performed a continuous perceptual-motor task twice in a neutral context (N1, N2), once with threat of aversive shock at poor performance (T), and once with promise of monetary reward for good performance (R); T and R being balanced around N 2. Measures of tonic (slow) EMG activation were derived from the "passive" forearm, and structured (blind) interview assessed motivational state. It was concluded that motivational state, rather than statedominance, was associated with EMG activation. The telic state was significant to high EMG activation for the N I and T treatments in particular.     

Motor inhibition, reflection impulsivity, and trait impulsivity in pathological skin picking

Pathological skin picking (PSP) is often recognized as an impulse control disorder. The current study sought to investigate the relationship between PSP and different forms of impulsivity. University students that met criteria for PSP (n = 55) and university students without history of PSP (n = 55) answered a multidimensional impulsivity questionnaire (the UPPS Impulsive Behavior Scale) and completed 2 neurocognitive tasks that assess impulsivity (the Stop Signal Task and the Information Sampling Task). The PSP group scored significantly higher than the control group on the negative and positive urgency subscales of the UPPS, but the groups did not differ on other subscales or the neurocognitive tasks. Logistic regression demonstrated that the urgency scales added to the prediction of PSP after negative affect and other forms of impulsivity were adjusted for. The results indicate that PSP sufferers are characterized by emotion-based impulsivity and do not appear to be impulsive in other ways.     

Functional brain imaging as a looking-glass into the degraded brain: reviewing evidence from Alzheimer disease in relation to normal aging

Research on the real-time relationship between brain activity and mental performance is intense. However, relatively few studies have been devoted to patients with different diseases or lesions. Such studies may cast light on certain aspects of brain activity, such as plasticity. This review summarizes studies on Alzheimer's disease (AD) patients where the techniques to map brain activity in relation to mental performance have been utilized. Research findings suggest, that there is a spectrum of changes in AD patients that is distinct from that seen in healthy aging. These changes include: (i) loss of activated regions, (ii) reduced activation possibly due to brain degeneration typical of AD, (iii) the emergence of newly activated regions in order to compensate for minor brain deterioration (e.g., an enlargement of activated regions sometimes manifested as an increased bilaterality or a hemispheric shift of activation, and dedifferentiation), (iv) decreased level of activation, and (v) no change at all, which may occur in easy tasks or tasks that do not involve regions exposed to brain atrophy. In conclusion, the pattern of activation in AD depends on interactions between the clinical stage of patients, and the pattern of brain degeneration, as well as the task difficulty and specific networks necessary for solving the task.     

Need-informational interaction of brain structures

The data presented deal with the role of four main brain structures in the development of emotional states and the organization of purposeful behavior. According to these data, the frontal neocortex orients behavior towards signals of highly probable events (reinforcement), whereas the hypothalamus is the basis for satisfaction of the dominant need. Unlike the neocortex, the hippocampus reacts to events of low probability, which is typical of emotionally stressed brain activity. Unlike the hypothalamus, the amygdala creates the balance, the dynamic coexistence, of competing needs (motivations) and emotions generated by such needs, which makes behavior more adequate. Individual characteristics of the interaction among the four brain structures is the basis for the individual types of higher nervous activity.     

Turn-taking interaction as a cooperative and co-creative process

In the present article, computer simulation of turn-taking interaction was studied and compared with psychological experiments such as the double TV experiment and synchronous imitation. By introducing the concepts of virtual agents, prediction error and adaptability, the simulation showed that turn-taking dynamics is a cooperative and co-creative process between two agents, which is in accordance with psychological findings. In particular, much attention is paid to styles of motion, as turn-taking with chaotic spatial pattern has developed to be sensitive to it.     

A reflection on learning crafts as a practice for self-development

This paper represents a reflection on craft as a process that stimulates self-development. Central to this approach is the perception of craft, not as a means of production, but as an exercise of relating to the world. The paper suggests that through the dialogue between the mind, body and environment craft practitioners experience a particular form of connection with the world that reshapes their perceptual and conceptual understanding of it. Rather than following an ego-driven tendency to control, a craftsperson is exposed to modes of ‘knowing’ and ‘being’ that embrace the inherent uncertainty of a complex world. The learning experience of a novice (lead author) demonstrates such a course of development in this paper. In particular, the liminal space that needs to be created for the dialogue between the self and the non-self is explored. This personal narrative is woven together with the experience of craft masters within different social contexts and value systems (from traditional to modern to postmodern) and their views on the process of being and becoming a craftsperson.