The development of a Peer Aggression Coping Self‐Efficacy Scale for Adolescents

This study presents findings regarding the reliability and validity of a newly developed measure designed to assess children's self‐efficacy for coping with peer aggression. The sample consisted of 2,161 participants (1,071 females and 1,090 males, who ranged in age from 10 to 15 years; 63% White, 17% Middle‐Eastern, 10% Asian, and 10% from other ethnic groups). Exploratory and confirmatory factor analyses supported the four conceptualized coping self‐efficacy domains: self‐efficacy for proactive behaviour, self‐efficacy for avoiding aggressive behaviour, self‐efficacy for avoiding self‐blame, and self‐efficacy for victim‐role disengagement. Internal consistencies for the coping domains were between .87 and .90. Validity was examined by correlations between the coping self‐efficacy domains and psychological adjustment variables. Greater coping self‐efficacy was associated with less social anxiety, cognitive depression, and externalizing symptoms. The Peer Aggression Coping Self‐Efficacy Scale provides a useful measure for examining children's self‐efficacy for using a range of strategies to deal with peer aggression.     

The coordination of bimanual aiming movements: Evidence for progressive desynchronization

It is known that when simultaneous bimanual aiming movements are made to targets with different IDs (Index of Difficulty), Fitts' Law is violated. There is massive slowing of the easy target hand, but a debate has arisen over the degree of synchronization between the hands and whether this effect represents a coordinative structure or interference due to neural cross-talk. This issue was investigated in an experiment with 12 subjects who moved styli forward in the sagittal plane to pairs of targets that differed in difficulty (0.77/3.73 ID and 0.77/5.17 ID). Reaction time, movement time, and kinematic measures of resultant velocity and acceleration were analysed. The results showed clear-cut timing differences between the hands that depended on both the ID difference between target pairs and elapsed time of the movement. The violation of Fitts' Law was confined to the easy target hand. Pronounced individual differences in both timing differences and left-right asymmetry were also noted. Neither the coordinative structure nor the neural cross-talk models can fully account for these data, and it is possible that the initial constraints on movement are moderated by visually driven corrective movements.