Consistency and evidence

Williamson (2000) appeals to considerations about when it is natural to say that a hypothesis is consistent with one’s evidence in order to motivate the claim that all and only knowledge is evidence. It is argued here that the relevant considerations do not support this claim, and in fact conflict with it.     

Distinguishing Between Sex and Gender: History, Current Conceptualizations, and Implications

Many psychologists, particularly feminist psychologists, have drawn a distinction between the term sex and the term gender. The purposes of this paper were to review the history of this distinction and to illustrate the varied and inconsistent ways in which these terms are used. Historically, this distinction began with John Money and his colleagues in the 1950s (Money et al. 1955a, b, 1957); they used the term sex to refer to individuals?? physical characteristics and the term gender to refer to individuals?? psychological characteristics and behavior. Two decades later, Rhoda Unger (1979) argued that the widespread use of the term sex implies biological causes and promotes the idea that differences between women and men are natural and immutable. She proposed the use of the term gender to refer to traits that are culturally assumed to be appropriate for women and men. Her work was influential in prompting a widespread shift from the use of the term sex to the use of the term gender in psychological texts. Nevertheless, current definitions of sex and gender vary widely. Some authors use the terms interchangeably. Of those who distinguish between the terms, most construe gender as more related to cultural influences and sex as more related to biology. There are numerous inconsistencies in authors?? definitions, however. Additionally, in some cases, there appears to be a mismatch between how researchers define sex or gender and how they measure it. It seems likely that the distinction between the term sex and the term gender may become less meaningful and important over time.     

Emotion regulation moderates relationships between body image concerns and psychological symptomatology

The study investigated the moderating role of emotion regulation (ER) in relationships between body image concerns and psychological symptomatology. A community sample of 533 boys and girls (11-20 years) completed measures assessing body image thoughts and feelings, domain-specific and general ER strategies, drive for thinness, and bulimic, depressive and anxiety symptoms. Results indicated that ER moderated relationships between body image concerns and both bulimic and depressive symptoms, but not relationships between body image concerns and drive for thinness or anxiety symptoms. Adolescents who reported frequent body image concerns were more likely to have higher levels of bulimic symptoms if they tended to use avoidance and internal dysfunctional ER strategies. Furthermore, adolescents who reported frequent body image concerns were more likely to have higher levels of depressive symptoms if they used positive rational acceptance and internal functional strategies infrequently. Implications of the findings for prevention and intervention are discussed.     

Acquisition of decision making criteria: reward rate ultimately beats accuracy

Speed-accuracy trade-offs strongly influence the rate of reward that can be earned in many decision-making tasks. Previous reports suggest that human participants often adopt suboptimal speed-accuracy trade-offs in single session, two-alternative forced-choice tasks. We investigated whether humans acquired optimal speed-accuracy trade-offs when extensively trained with multiple signal qualities. When performance was characterized in terms of decision time and accuracy, our participants eventually performed nearly optimally in the case of higher signal qualities. Rather than adopting decision criteria that were individually optimal for each signal quality, participants adopted a single threshold that was nearly optimal for most signal qualities. However, setting a single threshold for different coherence conditions resulted in only negligible decrements in the maximum possible reward rate. Finally, we tested two hypotheses regarding the possible sources of suboptimal performance: (1) favoring accuracy over reward rate and (2) misestimating the reward rate due to timing uncertainty. Our findings provide support for both hypotheses, but also for the hypothesis that participants can learn to approach optimality. We find specifically that an accuracy bias dominates early performance, but diminishes greatly with practice. The residual discrepancy between optimal and observed performance can be explained by an adaptive response to uncertainty in time estimation.     

Studying Ideological Groups Online: Identification and Assessment of Risk Factors for Violence

Recent acts of violence have demonstrated the impact of violent ideological groups worldwide. However, the systematic study of these groups is somewhat limited. The Internet is a valuable tool for investigating ideological group behavior because it is easily accessible and commonly used by these groups. This study attempted to extend previous research by examining online message boards to assess processes particular to ideological group membership. A content analysis was conducted on several group process variables using 29 groups with message boards. A Kruskal‐Wallis test with follow‐up pairwise comparisons was used to find that violent ideological groups differed from nonviolent ideological and nonviolent nonideological groups on 7 group process variables and 3 content variables. Implications are discussed.     

The Children's Behavior Questionnaire very short scale: psychometric properties and development of a one-item temperament scale

Little research has been conducted on the psychometrics of the very short scale (36 items) of the Children's Behavior Questionnaire, and no one-item temperament scale has been tested for use in applied work. In this study, 237 United States caregivers completed a survey to define their child's behavioral patterns (i.e., Surgency, Negative Affectivity Effortful Control) using both scales. Psychometrics of the 36-item Children's Behavior Questionnaire were examined using classical test theory, principal factor analysis, and item response modeling. Classical test theory analysis demonstrated adequate internal consistency and factor analysis confirmed a three-factor structure. Potential improvements to the measure were identified using item response modeling. A one-item (three response categories) temperament scale was validated against the three temperament factors of the 36-item scale. The temperament response categories correlated with the temperament factors of the 36-item scale, as expected. The one-item temperament scale may be applicable for clinical use.     

The contribution of the inferior parietal cortex to spoken language production

This functional MRI study investigated the involvement of the left inferior parietal cortex (IPC) in spoken language production (Speech). Its role has been apparent in some studies but not others, and is not convincingly supported by clinical studies as they rarely include cases with lesions confined to the parietal lobe. We compared Speech with non-communicative repetitive tongue movements (Tongue). The data were analyzed with both univariate contrasts between conditions and probabilistic independent component analysis (ICA). The former indicated decreased activity of left IPC during Speech relative to Tongue. However, the ICA revealed a Speech component in which there was correlated activity between left IPC, frontal and temporal cortices known to be involved in language. Therefore, although net synaptic activity throughout the left IPC may not increase above baseline conditions during Speech, one or more local systems within this region are involved, evidenced by the correlated activity with other language regions.