Does Dissociation Among Adolescents Predict Difficulties? A Panel Study in Japan

Dissociation has been reported to be associated with emotive-relational and behavioral difficulties; however, the temporal relationship between dissociation and these difficulties is unclear. Accordingly, this study investigated whether dissociation predicts difficulties (including emotional symptoms, conduct problems, hyperactivity, and peer problems) in adolescents. A two-wave cross-lagged panel study (Time 1: September–November 2016, Time 2: February–March 2017) was conducted among 1,773 Japanese junior high and high school students at two private schools (995 boys and 778 girls; M_age = 14.79 years at Time 1 and 15.09 years at Time 2). Dissociation was assessed using the Japanese version of the Adolescent Dissociative Experiences Scale and perceived difficulties were assessed via the Strengths and Difficulties Questionnaire. A cross-lagged effects model analysis indicated that high dissociation scores at Time 1 predicted high difficulties scores at Time 2. These findings suggest that dissociation could effectively predict difficulties in junior high and high school students. This study expands the field's understanding of the temporal relationship between behavioral problems and dissociation, which could help prevent problem behaviors.     

Pigeons (<Emphasis Type="Italic">Columba livia</Emphasis>) know when they will need hints: prospective metacognition for reference memory?

Despite their impressive cognitive abilities, avian species have shown less evidence for metacognition than mammals. We suspect that commonly used tasks such as matching to sample might be too demanding to allow metacognitive processing within birds’ working memory. Here, we examined whether pigeons could control their behavior as a function of knowledge levels on a three-item sequence learning task, a reference memory task supposedly requiring fewer working memory resources. The experiment used two types of lists differing in familiarity. One was familiar to the pigeons through repeated exposure, whereas the other was novel in every new session. In test sessions, pigeons could choose between a trial with a hint specifying the next item to peck and one with no hint. However, successful responses in trials with a hint resulted in lowered rates of primary reinforcement: .60 in the first test and .75 in the second. Results showed that two of four pigeons chose the trial with a hint significantly more often before receiving a novel list than the familiar list in the four sessions of the first test, and three did so in the second test. Impressively, one bird showed robust evidence in the very first sessions in both tests. These results suggest that pigeons may monitor their long-term knowledge states and thereby control their environment before starting to solve a task.     

Long-term metastability of light-induced defects in hydrogenated amorphous silicon

The decay of the peak intensity of the electron spin resonance signal associated with light-induced dangling bonds in a-Si(H) has been measured at room temperature as a function of time during very long intervals such as 3400 days after the intense pulsed illumination was turned off. The decay curve is fitted by an exponential function with a decay constant of 393 days and reaches a steady-state value smaller than the value taken before illumination. Such a long-term metastability of light-induced dangling bonds in a-Si:H is discussed in terms of reconstruction of the amorphous network occurring through hydrogen motion.     

Morning-evening type and stress-related personality in Japanese college students

An earlier report by Mecacci and Rocchetti showed a significant, weak, and positive correlation between Evening type as measured by the Morningness-Eveningness Questionnaire and Type A personality as measured by the Jenkins Activity Survey and the Bortner Type A Scale in Italian college students. The present study of 503 Japanese college students yielded a significant and weakly negative correlation. The bases for the different results were discussed in a psychophysiological context.     

A revised method for projecting two different movies to two groups of viewers without their noticing the duality

The MORI technique reported in Mori (2003) has evolved into its second generation after the appearance of a new type of video projector with two advantages over the first generation. The new MORI technique uses a pair of DLP projectors instead of the LCD type. The improved technique does not require sideways framing of the movie for presentation as required formerly. Therefore, any ready-made movie clip can be used. Second, it utilizes a pair of circular polarizing filters instead of linear polarizers. Linear polarizing filters may leak the to-be-blocked light wave when they are tilted. Circular polarizing filters are less susceptible to that weakness. The effectiveness of the revised technique has been proved by several studies carried out in two separate laboratories in which undergraduates and preschoolers participated as eyewitnesses to observe simulated criminal events presented using this technique.     

A comparison of body perceptions in relation to measured body composition in young Japanese males and females

The body composition of 139 Japanese females and 84 Japanese males (aged 18–30 years) was measured using anthropometry to assess gender differences in body perceptions in relation to their measured values. Participants were asked to rate perceptions of their own “heaviness” and “fatness” and these were compared to their BMI and percent body fat (%BF). Japanese females showed a significantly greater desire to lose body weight (−4.20 ± 0.6 kg) compared to males (0.27 ± 1.4 kg). Females also showed poor understanding of their “heaviness” and “fatness” in relation to actual body composition compared to males. The results confirmed distinct gender differences in body perception in relation to actual body composition and attitudes to weight management. Further promotion of “healthy” body image is recommended for the Japanese population.     

Plasticity of ability to form cross‐modal representations in infant Japanese macaques

In a previous study, Adachi, Kuwahata, Fujita, Tomonaga & Matsuzawa demonstrated that infant Japanese macaques (Macaca fuscata) form cross‐modal representations of conspecifics but not of humans. However, because the subjects in the experiment were raised in a large social group and had considerably less exposure to humans than to conspecifics, it was an open question whether their lack of cross‐modal representation of humans simply reflected their lower levels of exposure to humans or was caused by some innate restrictions on the ability. To answer the question, we used the same procedure but tested infant Japanese macaques with more extensive experience of humans in daily life. Briefly, we presented monkeys with a photograph of either a monkey or a human face on an LCD monitor after playing a vocalization of one of these two species. The subjects looked at the monitor longer when a voice and a face were mismatched than when they were matched, irrespective of whether the preceding vocalization was a monkey's or a human's. This suggests that once monkeys have extensive experience with humans, they will form a cross‐modal representation of humans as well as of conspecifics.     

Perceived range, perceived velocity, and perceived duration of the body rotating in the frontal plane

We investigated perceived range, perceived velocity, and perceived duration of the body rotating in the frontal plane (in roll). Specifically, to examine how shear to the otoliths in the inner ears and tactile pressure to the trunk affect judgments of range and velocity, in two experiments, we manipulated rotating range (30°–160°), rotating velocity (1.8°/sec to 9.6°/sec), mean tilt of the body (?60°, 0°, and 60°), and exposure to the visual vertical. Thirty-three normal or blindfolded participants made verbal judgments of range, velocity, and duration for each combination of these factors. The exponents of the power functions fitted to these judgments were, as a first approximation, .94, .61, and .84 for range, velocity, and duration, respectively, and perceived velocity was proportional to the ratio of perceived range to perceived duration (r = .91). These results suggest that the vestibular and somatosensory inputs are effective on judgments of range, but less so on judgments of velocity, and that perceived velocity may be determined as a ratio of perceived range to perceived duration. In addition, we found that (1) when the range the body has traveled is constant, the perceived range increases as the objective velocity decreases (proprioceptive τ effect); (2) self-motion through the tilted roll sometimes enlarges perceived range and perceived duration but reduces perceived velocity; and (3) the exposure to the visual vertical reduces variability of judgments for range and velocity and also reduces perceived range and perceived velocity of self-motion within a small range through the vertical roll.     

Acquisition of a same-different discrimination task by pigeons (Columba livia)

Four homing pigeons were trained to discriminate two figures simultaneously presented on an LCD screen. The figure was either a rectangle (A) or a square (B), and four combinations of the two figures, AA, AB, BA, BB, appeared in a pseudo-randomized order. The pigeons' task was to peck one of these figures based upon whether the two figures were identical or not. One pigeon successfully learned this discrimination, with proportions of correct responses above 90% in two consecutive sessions. Of the other birds, two performed above chance level but had difficulty meeting a learning criterion of above 80% in two consecutive sessions. All birds achieved this criterion when the combinations of figures presented were reduced to two. Results suggested that learning the present same-different discrimination is within the capacity of pigeons to a certain extent, although there exists considerable individual variation in the pigeons' skills to acquire complex discrimination.     

Der Weg der Psychoanalyse nach Japan

The establishment of psychoanalysis in Japan was a consequence of opening the country to the influence of the western world by the Meiji restitution of 1868. Thus western psychological thought was also spread to Japan. On this basis, psychoanalysis developed through personal contacts and experiences of individuals and infiltrated into intellectual circles and finally into psychiatry. The establishment of two psychoanalytical societies, one for analysts and one where also lay people had access led to a specific and unique organizational structure. The ??Japanese way?? of psychoanalysis is on the one hand characterized by the confrontation with Buddhism and on the other by specific applications which reflect a certain reserve in the Japanese society to the ??standard procedure?? of psychoanalytic therapy. In this way psychoanalysis in Japan implants a diversity into the international discourse which opposes the current trend towards general homogenization.