Applying Occam’s razor in modeling cognition: A Bayesian approach

In mathematical modeling of cognition, it is important to have well-justified criteria for choosing among differing explanations (i.e., models) of observed data. This paper introduces a Bayesian model selection approach that formalizes Occam’s razor, choosing the simplest model that describes the data well. The choice of a model is carried out by taking into account not only the traditional model selection criteria (i.e., a model’s fit to the data and the number of parameters) but also the extension of the parameter space, and, most importantly, the functional form of the model (i.e., the way in which the parameters are combined in the model’s equation). An advantage of the approach is that it can be applied to the comparison of non-nested models as well as nested ones. Application examples are presented and implications of the results for evaluating models of cognition are discussed.     

Perceived Peer Norms,Casual Sex,and AIDS Risk Prevention1

To facilitate more effective AIDS education with heterosexual college students, an etiological study of AIDS risk behavior was conducted on a sample of 1,035 students at a large western university. In this study, “AIDS risk behavior” refers to participation in casual sex, failure to use condoms, and resistance to changing casual sex activity. Knowledge regarding AIDS had no significant correlation with AIDS-risk behavior. However, “perceived peer norms” (termed Peer Norm in this study) was a major predictor variable in AIDS risk behavior. Peer Norm was defined as perceived AIDS-risk attitudes and the behavior of one's peers. These findings contrast some what with those of Emmons et al.'s (1986) study of homosexual men. This difference may be due to the focus in the present study upon heterosexual university students as subjects. For this group, our results suggest that programs targeting the peer group in AIDS prevention education are especially needed. These might include peer-based AIDS education, emotion-oriented discussion sessions, encounters with “Peers-with-AIDS” models, and role-playing of assertive responses.     

Postural fluctuations during pointing from a unilateral or bilateral stance

An experiment was conducted to compare the effects of bilateral and unilateral stance on postural fluctuations and intralimb coordination during active balance control. Fifteen participants stood bilaterally and unilaterally while conducting a pointing task with an outstretched arm. Excursion of center of foot pressure (CoP) and limb movements were recorded with a force plate and eight dual-axis accelerometers, respectively. Compared to bilateral stance, unilateral stance resulted in wider CoP trajectories and greater postural fluctuations, especially in the lower limbs. The limb-dependent postural fluctuations during unilateral stance were associated with an increased coupling between the upper limb segments and a decreased coupling between the segments of the stance leg. Unilateral stance further resulted in greater regularity and spectral changes in postural fluctuations of the trunk and lower limb due to increased central oscillations (8-15 Hz). The observed structural differences in postural fluctuations between unilateral and bilateral stance strongly suggested that the postural control system modulates joint stiffness in a stance-dependent manner. Probably, in unilateral stance, attentive control was shifted to the stance leg at the expense of increasing arm stiffness to reduce movement redundancy.     

Is peer victimization related to body esteem in 10-year-old girls and boys?

Several studies show that a history of exposure to appearance-related teasing is linked to body dissatisfaction. This study extends those findings by examining the impact of bullying, and other forms of peer victimization, on different aspects of 10-year-old girls’ and boys’ body esteem. Participants were 960 Swedish 10-year-olds, 515 girls and 445 boys. Principal results show that social exclusion is related to 10-year-olds’ evaluations of their general appearance, to evaluations of their weight, and to beliefs about how others perceive their appearance. Furthermore, bullied girls have poorer body esteem in terms of beliefs of how others perceive their appearance than do bullied boys. Appearance teasing was associated with girls’ poorer body esteem in terms of general appearance and beliefs of others views of their appearance. For boys, teasing was associated with poorer body esteem on all dimensions. Thus, this study implies that a wider range of peer victimization relates to children's negative self-perceptions than was former known.     

Learning a new human-computer alphabet: the role of similarity and practice

Two purposes motivated this study: (a) to quantify the difficulty in learning various symbols of the alphabet used to enter data into a personal digital assistant (PDA), and (b) to investigate the interaction of item difficulty with practice conditions that promote varying levels of cognitive effort. Levels of compatibility between members of the PDA alphabet and English were quantified through introspective ratings in Experiment 1 and objective performance measures in Experiment 2. Three levels of item compatibility were learned under conditions of proactive or retroactive augmented information in Experiment 3. Contrary to expectations, the item similarity effect did not interact with practice schedules—a retroactive augmented information condition resulted in degraded levels of acquisition performance, but superior retention levels, compared to the proactive condition. These findings are discussed in terms of the relative merits of cognitive effort in skill acquisition.     

A postcolonial Pannenberg? Mimicry,the law,and the cross of love

This paper employs the postcolonial concepts of mimicry and hybridity to interpret Wolfhart Pannenberg's understanding of the violence done to Jesus on the cross and the subversive reconciliatory love that it engenders. According to Pannenberg, although the man Jesus was crucified as blasphemer of the Jewish law, the resurrection vindicated Jesus so that the ones accusing Jesus were retroactively deemed to be the actual blasphemers. As a result, Jesus ended up dying not for his own alleged breaking of the law, but as an inclusive substitute for all blasphemers of God (through amour propre) deserving death. Thus, the resurrection confirmed Jesus’ divine identity and his earthly teaching that love supersedes and transforms the law. Applying the concept of mimicry to Pannenberg, on the cross the symbolic and semiotic are held together in tension for in mimicry the “not-quite sameness” menaces the colonizer. The cross, ostensibly a symbolic sign of abjection, is mimicked by the suffering of Jesus and subverted through a practice of inclusive semiotic love which recapitulates sinful human life toward a life of transformed autonomy. Pannenberg displays a pseudo postcolonial understanding of subverting oppressive law into love. However, on account of his futurist ontology, the eschatological totality is underscored relative to formative experiences, leaving him vulnerable to postcolonial critiques of essentialism, which can reinscribe colonialism. I contend that Pannenberg employs a strategy of “strategic particularism” in which concepts such as mimicry and hybridity are helpful as hermeneutical tools but ultimately provisional and temporary relative to the whole.     

Two Moralities: Reinterpreting the Findings of Empirical Research on Moral Reasoning in Taiwan

This paper reinterprets the findings of previous empirical research on moral reasoning and moral judgment conducted in Taiwan using Kohlberg's research paradigm. It consists of three major parts. The first part explores Kohlberg's theory of moral development and its limitations. Gibb's (1979) two-phase model is used to emphasize the necessity of studying cultural heritage in understanding the prevalent moral reasoning of existential phase adults in a given society. The second part presents an analysis of Confucian ethics (Hwang, 1995), and proposes a conceptual scheme for discerning the significant features of Confucian ethics by referring to distinctions between positive/negative and imperfect/perfect duties. The discretionary features of Confucian ethics are further analyzed in terms of Shweder et al .'s (1990) scheme for discerning a rationally defensible moral code. In addition, the Confucian moral dilemma and its modern fate in the New-Culture Movement of the May Fourth period on mainland China, and the 1960s Gong De Movement in Taiwan are discussed. The third part of this paper reinterprets the findings of several empirical studies on moral reasoning in Taiwanese society. Special attention is paid to Cheng's (1991) data from interviews with a group of college students using Kohlberg's moral dilemma. The implication of her findings is discussed on the basis of the new conceptual scheme.     

Correlates of the objective and subjective experiences of sexual harassment in high school

The present study used retrospective reports of primarily white female university students to examine a number of issues related to sexual harassment in high school. Results indicate that underperception of sexual harassment in high school exists in that reports of objective experiences appear to be quite high and exceed the actual labelling of these experiences as sexual harassment. Those who reported having an overprotective mother, observing fewer positive behaviors between their parents, and experiencing unwanted sexual contact during childhood experienced a greater number of objectively-defined incidents of sexual harassment, than those who did not. Underperception of sexual harassment was associated with a greater frequency of negative behaviors directed toward the father by the mother, but was not related to experiencing unwanted sexual contact during childhood.We would like to thank W. A. Fisher, D. Hazlewood, J. Olson, and the anonymous reviewers for their helpful comments.     

Personality Adjustment in College Students With a Parent Perceived as Alcoholic or Nonalcoholic

Adjustment of 547 college students was examined by the variables of alcoholic parentage and participant gender. Results from a multivariate analysis of variance, using the Diagnostic Inventory of Personality and Symptoms, indicated significant main effects for gender but not for alcoholic parentage. Significant gender differences occurred for alcohol abuse, drug abuse, paranoid psychosis, affective depression, anxiety disorders, psychological factors affecting physical condition, immature character, and neurotic character. Findings suggest that college students from alcoholic homes should not be distinguished from the general population in terms of their adjustment.