Instrumental Outcome Devaluation Is Attenuated by the Anti-emetic Ondansetron

In three experiments we assessed the effect of an anti-emetic, the selective S-HT antagonist ondansetron, on (1) the conditioning of a taste aversion using lithium chloride (LiCl); (2) the expression of that aversion; and (3) instrumental outcome-devaluation effects. In Experiment 1 it was found that ondansetron reduced the aversion induced by LiCl when administered prior to the LiCl injection and also attenuated the expression of that aversion when administered prior to test sessions. In Experiments 2 and 3, thirsty rats were trained, in a single session, to lever press and chain pull for sucrose and saline solutions concurrently before being injected with LiCl. They were then re-exposed to both solutions, one after injection of vehicle and the other after injection of ondansetron. In a choice extinction test on the levers and chains, animals performed more of the action whose training outcome was re-exposed under ondansetron than the other action, whether the test was conducted after an injection of vehicle or after one of ondansetron.     

Is Cumulative Exposure to Suicide Attempts and Deaths a Risk Factor for Suicidal Behavior Among Firefighters? A Preliminary Study

The association between cumulative exposure to suicide attempts and deaths and suicidal behavior was examined in a sample of 61 professional firefighters. On average, firefighters reported 13.1 (SD = 16.6) exposures over the course of their lifetime. Cumulative exposure to suicide attempts and deaths was positively correlated with suicidal behavior (r = .38, p = .004). Moreover, firefighters with 12+ exposures were more likely to screen positive for risk of suicidal behavior (OR = 7.885, p = .02). Additional research on the potential impact of cumulative exposure to suicide attempts and deaths on firefighters' health and safety is needed.     

Friendships in middle childhood: Links to peer and school identification,and general self-worth

Children's friendships are important for well-being and school adjustment, but few studies have examined multiple indices of friendships together in middle childhood. The current study surveyed 7- to 11-year-olds (n = 314) about their friendships, best friendships, friendship quality and indices of self-worth, identification with peers, and identification with school. Peer relationships were positively related to self-worth, but not identification with peers or school. Best friendship quality moderated the relationship between number of reciprocated friendship nominations and self-worth. Children with a reciprocated best friend had higher friendship quality and peer identification than others. Where best friendship was reciprocated, the relationship with identification with peers was mediated via positive friendship quality. The results suggest that friendship reciprocity is particularly relevant for children's self-worth and identification with peers. The findings are discussed in relation to the importance of fostering the development of reciprocated friendships.

Statement of contribution

What is already known on this subject?

• Friendships are related to well-being, school relations, and how young people feel about their peers at school.
• Friendship quality may be important in moderating the relationship between peer relations and adjustment.

What does this study add?

• Various aspects of friendships are studied simultaneously with younger children than much previous research.
• Reciprocated best friendships were better quality than partial or non-reciprocated best friendships.
• Friendship reciprocity was most relevant for children's self-worth and peer identification.

     

PEDAGOGICAL KNOWLEDGE AND ELEMENTARY READING METHODOLOGY TEXTBOOKS: IN SEARCH OF A SHARED PARADIGM

Abstract

The purpose of the present study was to investigate whether there is evidence to support the existence of a shared paradigm of pedagogical knowledge in elementary reading methodology textbooks. To accomplish this purpose, a computer‐based citation concordance was prepared that represented 5,760 references from 12 elementary reading methodology textbooks with copyright dates ranging from 1985 to 1989. The results suggest the existence of a shared paradigm of pedagogical knowledge in elementary reading methodology textbooks. The shared paradigm is not sharply defined and unambiguous in content, instead, it is composed of a complex amalgam of knowledge on philosophies, principles and practices representing a variety of perspectives.