The aim of this study was to investigate why certain youths identify with delinquent groups by examining specific factors that increase identification with them, such as intergroup relationships. Specifically, we hypothesized that the permeability of group boundaries would moderate the effect of group discrimination on identification with a delinquent group. In total, 96 male youths were recruited from four juvenile classification homes. The results revealed that youths who perceived group boundaries with lower compared with higher permeability cognitively identified with delinquent groups more strongly when perceiving group discrimination from teachers or the police; this finding supported our hypothesis. No other significant interaction effect was observed. Conversely, in terms of affective identification, we found an unexpected interaction between the permeability of group boundaries and group discrimination from peers. Overall, the findings did not support our hypothesis. However, some of the results suggest that delinquent youths may be able to decrease cognitive group identification by having friends outside of the delinquent group, even if they experienced discrimination from conformity groups such as teachers and the police.

This study aimed to reveal the risk factors for a person to perpetrate stalking-like behaviors following the end of a romantic relationship based on personality traits (attachment anxiety and narcissism), the characteristics of a romantic relationship before a breakup, and the emotions and thoughts of a person after a breakup. To develop two scales measuring the characteristics of a romantic relationship before a breakup and the emotions and thoughts of a person after a breakup, a web-based survey of 189 females and 165 males was conducted in Study 1. In Study 2, a national survey was conducted using two-stage stratified sampling; 106 females and 110 males who experienced the end of a romantic relationship during the past five years and did not initiate their most recent breakup were analyzed. The results of a multiple-group analysis revealed that both attachment anxiety and feelings that a partner was his/her “one and only” increased egoistic preoccupations after a breakup, and the egoistic preoccupations predicted the perpetration of stalking-like behaviors in both males and females.

Grapheme-color synesthesia is a condition in which visual letters or characters induce a specific color sensation. It has been suggested that a range of linguistic properties influence synesthetic grapheme-color correspondence, but the influence of graphemic (orthographic) information is not well understood. In this experiment, synesthetes chose up to two synesthetic colors for each Japanese Kanji character. The results showed that characters that could be divided into right and left subcomponents (radicals) were associated with a higher number of synesthetic colors than characters that could not be divided. This tendency was stronger for projectors, who perceive colors visually in external space, than for associators, who perceive colors in their ‘minds eye’. The results of this study suggest that the graphemic information of Kanji characters affects the number of synesthetic colors, especially for projectors.

It is widely accepted that sex offenders frequently deny their offense or minimize their responsibility, and there is controversy regarding how this should be approached in psychological interventions. However, few studies have examined the relationship between denial/minimization and recidivism, and the results are inconsistent across the limited body of research. The purpose of this research was to estimate the prevalence of denial/minimization in sex offenders and examine its relationship with recidivism. We examined 1,484 sex offenders who had been convicted from July 2008 to June 2009 in Japan. The prevalence of both denial and minimization was 16.3% overall. In addition, the relationship between denial/minimization and recidivism was investigated for 753 convicts whose sentences had been suspended. Controlling for possible confounding variables, including empirically known risk factors, logistic regression revealed that denial/minimization did not significantly increase the possibility of both any and sexual recidivism during the 5-year follow-up period. Implications for psychological intervention and future research are discussed.

A field experiment was conducted to examine the factors in threat appeal responsible for maintenance of crime-prevention behavior. At four public bicycle parking lots, 256 riders with variable receiver vulnerability characteristics were encouraged to use an extra bicycle lock. They were randomly presented with one of three threat messages featuring victims of bicycle theft (identifiable victim, statistical victim, or control), followed by either high- or low-efficacy preventative-messages. After extra locks were installed on their bicycles, participants’ use of the lock was observed five times within 28 days after the intervention. A mixed-effect generalized linear model revealed that vulnerability of the participants increased the use of the lock immediately after the intervention. Meanwhile, highly vulnerable participants who were presented with an identifiable victim and high-efficacy messages decreased their use of the lock significantly compared to low-vulnerability participants and those who were presented with the low-efficacy message. The result implies that threat appeal strategies differ depending on receiver vulnerability and the type of preventative behavior.