A quantitative analysis of sequential effects with numeric stimuli

In a simulated absolute judgment task, subjects guessed which numeral would appear next in a random sequence. Feedback was given after every trial. The average response for the nth trial was analyzed as a joint function of both the response and the feedback for the previous trial. The results confirm those of an earlier study by Ward and Lockhead (1971). Two new models are proposed to explain sequence effects in this task of infinite difficulty. Although computer simulations based on the models fit the data reasonably well, problems remain when attempts are made to apply the same theoretical reasoning to absolute judgment tasks involving actual stimuli.     

Willingness to Help a Stranger: The Effects of Social Context and Opinion Similarity1

Two field experiments investigate how information about aspects of the social environment affects willingness to help others who are similar or dissimilar. Subjects were pedestrians who found a lost packet of materials containing information about the opinions of the packet's loser and a survey report which claimed that the quality of life in the neighborhood had either improved or deteriorated. In the fiist study, the opinions were varied in order to create different degrees of opinion similarity between the loser and subject. Results showed that relatively slight differences between the loser's and subject's opinions made subjects unwilling to help (return the lost packet) when information about the social environment suggested a negative state of affairs, e.g., quality of life deteriorating. However, when information about the social environment suggested a positive state of affairs, subjects were willing to help, even if there was little similarity of opinion. In the second study, subjects learned that the loser of the packet agreed with their views on one opinion but disagreed on another. In this study, one of the two opinions concerned the same social issue as the one described in the survey report. Results demonstrated that subjects helped when there was agreement on the social issue that was also highlighted in survey reports of a negative state of affairs in the social environment and withheld help when there was disagreement on this issue. There were trends for the same result with information about a positive state of affairs in the social world.     

Formal operations and ego identity in adolescence

This study investigated the relationship between the development of formal operations and the formation of ego identity in adolescence. Two Piagetian formal tasks, the combinatorial and equilibrium in the balance, and two measures of ego identity, a semistructured interview and an incomplete sentences test, were administered to 20 males and 20 females each at age levels 10-12, 13-15, and 16-18 years. Significant positive correlations were obtained between combinatorial ability and degree of identity, suggesting that high identity may facilitate the application of combinatorial operations. Males exhibited superior performance on the balance task; thus they may utilize more effective cognitive strategies, or be more inherently motivated to solve mechanical problems than females. On the identity interview, females showed a greater degree of commitment to future goals than males in middle adolescence; this may reflect the earlier maturation of females.     

Sex differences in acting out chronic undifferentiated schizophrenics

29 male and 21 female chronic undifferentiated schizophrenics were classified as aggressive or nonaggressive on items of a behaviorally anchored checklist completed by ward personnel plus adjunctive measures of behavior during institutionalization. Women were rated as significantly more aggressive than men. The women engaged in more hostile acts, destroyed more property, were more verbally abusive, and were more uncooperative with staff and other patients than men. The results are discussed in terms of possible sex differences in diagnosis, severity of symptoms, age of onset, and admission/discharge practices.     

Catching up with wonderful women: The women‐are‐wonderful effect is smaller in more gender egalitarian societies

Inequalities between men and women are common and well‐documented. Objective indexes show that men are better positioned than women in societal hierarchies—there is no single country in the world without a gender gap. In contrast, researchers have found that the women‐are‐wonderful effect—that women are evaluated more positively than men overall—is also common. Cross‐cultural studies on gender equality reveal that the more gender egalitarian the society is, the less prevalent explicit gender stereotypes are. Yet, because self‐reported gender stereotypes may differ from implicit attitudes towards each gender, we reanalysed data collected across 44 cultures, and (a) confirmed that societal gender egalitarianism reduces the women‐are‐wonderful effect when it is measured more implicitly (i.e. rating the personality of men and women presented in images) and (b) documented that the social perception of men benefits more from gender egalitarianism than that of women.     

Analyzing the kinematics of hand movements in catching tasks—An online correction analysis of movement toward the target’s trajectory

Free, 3-D interceptive movements are difficult to visualize and quantify. For ball catching, the endpoint of a movement can be anywhere along the target’s trajectory. Furthermore, the hand may already have begun to move before the subject has estimated the target’s trajectory, and the subject may alter the targeted position during the initial part of the movement. We introduce a method to deal with these difficulties and to quantify three movement phases involved in catching: the initial, non-goal-directed phase; the goal-directed phase, which is smoothly directed toward the target’s trajectory; and the final, interception phase. Therefore, the 3-D movement of the hand was decomposed into a component toward the target’s trajectory (the minimal distance of the hand to the target’s parabolic [MDHP] trajectory) and a component along this trajectory. To identify the goal-directed phase of the MDHP trajectory, we employed the empirical finding that goal-directed trajectories are minimally jerky. The second component, along the target’s trajectory, was used to analyze the interaction of the hand with the ball. The method was applied to two conditions of a ball-catching task. In the manipulated condition, the initial part of the ball’s flight was occluded, so the visibility of the ball was postponed. As expected, the onset of the smooth part of the movement shifted to a later time. This method can be used to quantify anticipatory behavior in interceptive tasks, allowing researchers to gain new insights into movement planning toward the target’s trajectory.