Asymmetrical neural adaptation in lower leg muscles as a consequence of stereotypical motor training

Despite well-authorized facts regarding asymmetrical architectural changes between different limbs after persistent participation in particular motor training, no studies have addressed the neural aspects to the present. The authors undertook the study to elucidate the possibility of neural adaptation on a limb-by-limb basis after repetitive engagement in a particular motor training routine. We investigated lower leg muscles in endurance-trained track runners who have been trained by routinely running on a track in counterclockwise direction on curved paths. Stretch reflex responses in the plantarflexor muscles (soleus [SOL], medial [MG], and lateral head of the gastrocnemius muscle) were evaluated bilaterally with participants sitting at rest. Comparisons were made between homonymous muscles of the right (corresponding to outside leg for track running) and left leg (inside leg, likewise) and with a group of nontrained controls. The result clearly demonstrated that the responses were prominently different between the legs (thus, asymmetrical) in the MG muscles and partially in the SOL muscles in the trained group. In contrast, no such differences were obtained in the nontrained control group. The result demonstrated that neural adaptation took place asymmetrically and that could be attributable to their repetitive engagement in the stereotypical motor task.     

Bridging History and Social Psychology: What, How and Why

This special issue aims to bridge history and social psychology by bringing together historians and social psychologists in an exercise of reading and learning from each other??s work. This interdisciplinary exercise is not only timely but of great importance for both disciplines. Social psychologists can benefit from engaging with historical sources by being able to contextualise their findings and enrich their theoretical models. It is not only that all social and psychological phenomena have a history but this history is very much part of present-day and future developments. On the other hand historians can enhance their analysis of historical sources by drawing upon the conceptual tools developed in social psychology. They can ??test?? these tools and contribute to their validation and enrichment from completely different perspectives. Most important, as contributions to this special issue amply demonstrate, psychology??s ??historical turn?? has the potential to shed a new light on striking, yet underexplored, similarities between contemporary public spheres and their pre-modern counterparts. This issue thereby calls into question the dichotomy between traditional and de-traditionalized societies??a distinction that lies at the heart of many social psychology accounts of the world we live in. The present editorial will introduce and consider this act of bridging history and social psychology by focusing on three main questions: What is the bridge made of? How can the two disciplines be bridged? and Why we cross this interdisciplinary bridge? In the end a reflection on the future of this collaboration will be offered.     

Effects of intergroup and interpersonal context, and individuals' appraisal of their in-group on the intragroup comparison process

The present study examined whether individuals' endorsement of intergroup context moderates the social comparison process not only in the intergroup upward comparison condition, but also in the downward comparison condition, by experimentally manipulating the direction of intergroup comparison and interpersonal comparison for participants who appraise their in-group as high or low. As predicted, participants who appraise their in-group as high showed reflection processes in the intergroup upward comparison condition, but comparison processes in the intergroup downward comparison condition because of their endorsement of their in-group position. In contrast, participants who appraised their in-group as low showed comparison processes in the intergroup upward comparison condition, but reflection processes in the intergroup downward comparison condition. These results imply that the interplay between intergroup context and individuals' internal factors affect intragroup comparison processes.     

Comparison of ruminative responses with negative rumination as a vulnerability factor for depression

Several studies have shown that the ruminative responses, which are defined as a coping pattern that focuses on the symptoms of depression and on the possible causes and consequences of these symptoms, are associated with depression. Recently, negative rumination, which is defined as the tendency to continue to think about something bad, harmful, or unhopeful for a long time, has been proposed as a vulnerability factor for depression. The purpose of this study was to compare depression scores associated with negative rumination and ruminative responses. We expected to find depression associated with negative rumination. The sample consisted of 188 Japanese undergraduate students (83 men: M age= 19.0 yr., SD= 1.1; 105 women: M age = 19.1 yr., SD = 1.7) taking a human sciences course at a Japanese university. Subjects participated in an 8-mo. longitudinal study. Logistic analysis indicated that negative rumination was a significant predictor of depression. However, ruminative responses as a whole were not a significant predictor of depression after controlling for negative rumination. These findings suggest that it is important to distinguish whether rumination is focused on negative or nonnegative subject matter.     

Perceptual grouping in pigeons

Animal studies reveal that many species perceive partially occluded objects in the same way as do humans. Pigeons have been a notable exception. We re-investigated this anomaly of pigeon perception using a different approach from previous studies. With our method, we show that pigeons perceive occluded objects in the same manner as do other species. In addition, we report that pigeons can recognize perceptually transparent surfaces when the effect is induced by the same perceptual mechanisms as occlusion. These results give behavioral evidence that the perception of both occlusion and transparency is a common visual function shared by pigeons and humans, despite the structural differences between their visual systems.     

A Generalized Syllogistic Inference System based on Inclusion and Exclusion Relations

We introduce a simple inference system based on two primitive relations between terms, namely, inclusion and exclusion relations. We present a normalization theorem, and then provide a characterization of the structure of normal proofs. Based on this, inferences in a syllogistic fragment of natural language are reconstructed within our system. We also show that our system can be embedded into a fragment of propositional minimal logic.     

Temporal reticence of the self: who can know <Emphasis Type="Italic">my self</Emphasis>?

In this study, I will elaborate and extend the theoretical framework of the presentational self (Komatsu, Human Development 53:208–228, 2010) that finds the self in two aspects of our interaction with others or objects. From this perspective, the self is not an internal entity, a representation that can be revealed voluntarily when directly queried by researchers (e.g., through items of a questionnaire or an interview), but is what emerges from constantly relating with the immediate environment. The process structure of being in the environment that emerges in this relationship is the presentational self, which both an external observer and the person him/herself can detect but not necessarily describe in words. For further elaboration, first, I clarify that the triangular relationship between a study participant, others or objects, and observing researchers, which is essential in the presentational self, is also common in the methodological presuppositions of existing psychological studies on the self. Second, I apply the framework to a daily activity of oral storytelling in a Japanese elementary school, where the emergence of children’s self is observable through sequences of organized interactions with others. From these discussions, I demonstrate both the theoretical and practical importance of considering the self to refer to the relationships that we constantly create in our daily life.     

Processes of Social Influence on Sampling Behavior: The Effect of Other's Positive Attitude and Receiver's Prior Experience

Studies about attitude formation have pointed out the importance of sampling behavior. When thinking about actual social interaction scenes, it may be better to consider them as attitude-updating processes between those who have already formed attitudes based on some experience. Sixty-five participants took part in the experiment, in which the other's positive attitude and the participant's own prior experience were manipulated. After participants had been presented five types of puzzles (experience: direct vs. indirect), which had been made to improve analytic ability, their attitudes towards the puzzles were measured (“pre attitude”). They were shown the other's positive attitude (inconsistent vs. consistent), and they were given 10 min of free time before “testing on their analytic ability.” The amount of time spent on each puzzle was recorded to index sampling behavior and the attitudes towards the puzzles were measured after the free time (“post attitude”). The results of analyses showed that the other's positive attitude increased sampling behavior when the participant's attitude was positive (first-ranked) and negative (fifth-ranked), and that prior experience and sampling contributed to attitude change for the first-ranked puzzle. Those who had had direct experience and those who had spent more time sampling this puzzle tended to maintain their previous positive attitude. The potential boundary conditions of social influence on sampling behavior are discussed.     

How Signs Function in the Process of Meaning Construction: An Exemplification from <Emphasis Type="Italic">Gitai-go</Emphasis> in the Japanese Language

In this paper, I will examine the semiotic mediation process of meaning construction and the functioning of signs, focusing on a group of characteristic words, Gitai-go in the Japanese language. Mimic words in the Japanese language, including Gitai-go are applicable to various subjects based on their inter-sensory nature, and appear frequently in informal communication among Japanese, not only for young children but also in adults’ communication. When I consider their functioning from the viewpoint of meaning construction, their characteristic feature is their indefiniteness that is open to diverse forms of extension, including that of no further elaboration and continuous diffusion of the affective flavor within the current setting. Though the process is interpretable in terms of the Japanese culture that is characterized by vagueness, it is also a clear exemplification of how the indefiniteness of signs works in the process of meaning construction and in our communication.     

The link between involuntary non-regular employment and poor mental health: A cross-sectional study of Japanese workers

Involuntary non-regular employment is a severe inequity problem worldwide, and it may significantly affect the mental health of employees. The present study aimed to examine the relationship between employment type and mental health. Additionally, the characteristics of involuntary non-regularly employed workers were explored. An online-based cross-sectional study was conducted in Japan, and 1566 participants were included in the data analysis. The eligible participants were divided into four categories: regularly employed (n = 1092), voluntary (n = 134), average (n = 233) and involuntary (n = 107) non-regularly employed individuals, respectively. Involuntary non-regular employment was associated with greater lack of vigour, anger-irritability, fatigue, anxiety, and depression. It was higher among women, those who were single or had no childcare, and those who had lower personal income or shorter working hours, or who tended not to practice relaxation activities. Lower personal income was associated with a risk of anxiety and depressive symptoms. Those individuals experiencing involuntary non-regular employment had a higher risk of poor mental health; subgroup analysis showed that this was particularly true among men. Both encouragement of employment stability via policy reform and workplace mental health support for involuntary non-regularly employed individuals are urgent health concerns.