Multi-body dynamic coupling mechanism for generating throwing arm velocity during baseball pitching

The purpose of this study was to identify the detailed mechanism how the maximum throwing arm endpoint velocity is determined by the muscular torques and non-muscular interactive torques from the perspective of the dynamic coupling among the trunk, thorax and throwing and non-throwing arm segments. The pitching movements of ten male collegiate baseball pitchers were measured by a three-dimensional motion capture system. Using the induced-segmental velocity analysis (IVA) developed in this study, the maximum fingertip velocity of the throwing arm (MFV) was decomposed into each contribution of the muscular torques, passive motion-dependent torques due to gyroscopic moment, Coriolis force and centrifugal force, and other interactive torque components. The results showed that MFV (31.6 ± 1.7 m/s) was mainly attributed to two different mechanisms. The first is the passive motion-dependent effect on increasing the angular velocities of three joints (thorax rotation, elbow extension and wrist flexion). The second is the muscular torque effect of the shoulder internal rotation (IR) torque on generating IR angular velocity. In particular, the centrifugal force-induced elbow extension motion, which was the greatest contributor among individual joint contributions, was caused primarily by the angular velocity-dependent forces associated with the humerus, thorax, and trunk rotations. Our study also found that a compensatory mechanism was achieved by the negative and positive contributions of the muscular torque components. The current IVA is helpful to understand how the rapid throwing arm movement is determined by the dynamic coupling mechanism.     

Re-conceptualizing Self,Speaker, and Body: Applying an Enactive and Conversation Analytic Approach to Selfhood and Cognition

In this article I review significant contributions to the subfield of Embodied Cognition that formulate an inclusive account of the body's role in cognitive processes. I argue that a reconceptualization of the mind–body problem must take into account some notion of the self as a nonlocalized, transient phenomenon that emerges through day-to-day interaction. Drawing on literature from epistemology, phenomenology, and Conversation Analysis, I aim to revise contributions that rely on essentialized notions of the self and speaker, in terms of an enactive and Conversation Analytic approach to selfhood and cognition.     

Inconsistent-handed advantage in episodic memory extends to paragraph-level materials

Past research using handedness as a proxy for functional access to the right hemisphere demonstrates that individuals who are mixed/inconsistently handed outperform strong/consistently handed individuals when performing episodic recall tasks. However, research has generally been restricted to stimuli presented in a list format. In the present paper, we present two studies in which participants were presented with paragraph-level material and then asked to recall material from the passages. The first study was based on a classic study looking at retroactive interference with prose materials. The second was modelled on a classic experiment looking at perspective taking and the content of memory. In both studies, the classic effects were replicated and the general finding that mixed/inconsistent-handers outperform strong/consistent-handers was replicated. This suggests that considering degree of handedness may be an empirically useful means of reducing error variance in paradigms looking at memory for prose level material.     

To what degree do situational influences explain spontaneous helping behaviour? A meta-analysis

Prosocial behaviour is an interdisciplinary topic, involving psychologists, philosophers, and educators. Based on experimental helping research, some moral philosophers have claimed that helping behaviour is entirely situationally determined. The dominance of situational factor experimentation gives the appearance that situational factors alone can explain helping behaviour. This meta-analysis investigated situational explanations of helping behaviour with 286 effects and 46,705 participants from experimental studies with non-manipulation control groups, and observed unilateral adult behavioural helping. Results indicated expected group differences in helping behaviour frequency among help encouraging or help discouraging experimental conditions and no-manipulation control conditions. Helping behaviour was also frequent in help discouraging and control conditions and far from universal in help encouraging conditions. Because helping occurred in control groups, situational factors cannot explain all observed helping. Because helping was not universal in help encouraging conditions, it raises the question of individual differences in responsiveness to helping cues.     

自尊与人际互动：理论、研究与问题

基于自我确认理论开展的大量研究,有助于理解自尊对人际互动行为的调节作用。然而,研究者对自尊的测量工具不尽相同,筛选实验被试的标准也不尽一致,实验范式忽略了对实际人际互动情境的操纵,单纯采用人际选择反应作为测量自我确认的指标,因而难以形成具有整合性的理论模型。今后的研究有必要在编制合适的测量工具的基础上,将整体自尊与特殊自尊作为两个独立的变量置于整合性实验范式下开展研究,同时采用对人际评价信息的认知判断和对评价者的交往选择的双维指标,以全面揭示整体自尊与特殊自尊对自我确认过程的相对作用及其心理机制。     

Los Degradados: Out,down, dead: Transmitted and inflicted trauma as encountered in the analysis of a 6‐year‐old girl1

The author presents the analysis of a precocious traumatized little girl, which reveals the ways in which historical trauma is transmitted and intrafamilial trauma is both disguised and represented. The play as it evolves is seen to simultaneously communicate what the child struggles with and to resolutely try to hide what has actually happened. Analyst and child together participate in play which utilizes displacement, enactment and interactive enactment, the latter play mode being the very hallmark of profound traumatic experience. Carlotta, the child, helps the analyst to follow her quest for meaning making even as the interaction between them adheres to and departs from the deepening pentimenti of traumatic experience, which needs to be unraveled and reconstructed in order that her own developmental progression can be rejoined. The analysis facilitates Carlotta's capacity to play in a more unfettered fashion and to assist her family's recovery as well.     

Explaining after by before: Basic aspects of a dynamic systems approach to the study of development

The basic properties of a dynamic systems approach of development are illustrated by contrasting two simple equations. One, y_t+1 = f (y_t), is characteristic of dynamic systems models. The other, y_i = f (x_i), refers to what, for the sake of simplicity, is referred to as the standard developmental approach. We give illustrations from cognitive, language and social development to show the characteristic differences of these two types of models and show their complementarity. The article further compares the “Bloomington” with the “Groningen” approach to dynamic systems theorizing in developmental psychology. It continues with a discussion of two important questions. One involves the issue of measurement and the nature of developmental variables from the viewpoint of dynamic systems. The second concerns the question of short- and long-term time scales in developmental models, which is discussed on the basis of an example, namely dyadic interaction of young children in the context of different social statuses.     

在家庭自由游戏和智力任务游戏中亲子交往行为特征

本研究采用家庭录像观察,考察了53名4岁儿童及其父母在自然的家庭环境中的两个情境———自由游戏和完成拼图任务的智力游戏情境中儿童与其父母交往的行为特征和互动类型。结果发现:(1)在儿童4岁时,在家庭自由游戏情境中母亲的各种行为均显著多于父亲的各种行为,这表明在游戏过程中,母亲是儿童主要的交往对象。在拼图游戏情境中,除了父亲和母亲在商量和交流行为上没有显著差异之外,母亲的其他行为显著多于父亲的其他行为。儿童在这两个游戏情境中均表现出较多的顺从行为。(2)在自由游戏情境中,亲子互动类型包括四种:父母交流-儿童不交流型、母亲高控-儿童顺从型、父亲控制-儿童不顺从型和母亲不交流-儿童交流型。拼图游戏情境中,亲子互动类型有四种:父母放任-儿童独立型、父母控制-儿童顺从型、母子交流型和父亲控制-儿童顺从型。