The literature on affective determinants of physical activity is growing rapidly. The present paper aims to provide greater clarity regarding the definition and distinctions among the various affect-related constructs that have been examined in relation to PA. Affective constructs are organized according to the Affect and Health Behavior Framework, including: affective response to PA; incidental affect; affect processing; and affectively charged motivational states. After defining each category of affective construct, we provide examples of relevant research showing how each construct may (...) relate to PA behavior. We conclude each section with a discussion of future directions for research. (shrink)

Questions of how we know our own and other minds, and whether metacognition and mindreading rely on the same processes, are longstanding in psychology and philosophy. In Experiment 1, children/adolescents with autism (who tend to show attenuated mindreading) showed significantly lower accuracy on an explicit metacognition task than neurotypical children/adolescents, but not on an allegedly metacognitive implicit one. In Experiment 2, neurotypical adults completed these tasks in a single-task condition or a dual-task condition that required concurrent completion of a secondary (...) task that tapped mindreading. Metacognitive accuracy was significantly diminished by the dual-mindreading-task on the explicit task but not the implicit task. In Experiment 3, we included additional dual-tasks to rule out the possibility that any secondary task (regardless of whether it required mindreading) would diminish metacognitive accuracy. Finally, in both Experiments 1 and 2, metacognitive accuracy on the explicit task, but not the implicit task, was associated significantly with performance on a measure of mindreading ability. These results suggest that explicit metacognitive tasks (used frequently to measure metacognition in humans) share metarepresentational processing resources with mindreading, whereas implicit tasks (which are claimed by some comparative psychologists to measure metacognition in nonhuman animals) do not. (shrink)

In the past two to three decades health behavior scientists have increasingly emphasized affect-related concepts in their attempts to understand and facilitate change in important health behaviors, such as smoking, eating, physical activity, substance abuse, and sex. This article provides a narrative review of this burgeoning literature, including relevant theory and research on affective response, incidental affect, affect processing, and affectively charged motivation. An integrative dual-processing framework is presented that suggests pathways through which affect-related concepts may interrelate to influence health (...) behavior. (shrink)

During the early twentieth century, the Swiss Zoologist Adolf Naef (1883–1949) established himself as a leader in German comparative anatomy and higher level systematics. He is generally labeled an ‘idealistic morphologist’, although he himself called his research program ‘systematic morphology’. The idealistic morphology that flourished in German biology during the first half of the twentieth century was a rather heterogeneous movement, within which Adolf Naef worked out a special theoretical system of his own. Following a biographical sketch, we present an (...) English translation of a previously unpublished typescript from Naef’s estate, which Naef intended as the introduction to a textbook on Comparative Anatomy for which he was unable to find a publisher before his sudden death in 1949. The typescript contains Naef’s mature thoughts with unprecedented conciseness, focus, and clarity. The density of Naef’s text warrants a historical and contextual explication of its content. (shrink)

Patricia Williams made a number of claims concerning the methods and practise of cladistic analysis and classification. Her argument rests upon the distinction of two kinds of hierarchy: a divisional hierarchy depicting evolutionary descent and the Linnean hierarchy describing taxonomic groups in a classification. Williams goes on to outline five problems with cladistics that lead her to the conclusion that systematists should eliminate cladism as a school of biological taxonomy and to replace it either with something that is philosophically coherent (...) or to replace it with pure methodology, untainted by theory (Williams 1992, 151). Williams makes a number of points which she feels collectively add up to insurmountable problems for cladistics. We examine Williams' views concerning the two hierarchies and consider what cladists currently understand about the status of ancestors. We will demonstrate that Williams has seriously misunderstood many modern commentators on this subject and all of her five persistent problems are derivable from this misunderstanding. Some persons believe and argue, on grounds approaching faith it seems to me, that phylogeny comes from our knowledge of evolution. Others have found to their surprise, and sometimes dismay, that phylogeny comes from our knowledge of systematics. Nelson (1989, 67). (shrink)

Background: Studies have found that children with Autism Spectrum Disorder are more likely to make errors in appropriately producing referring expressions than are controls but comprehend them with equal facility. We tested whether this anomaly arises because comprehension studies have focused on manipulating perspective-taking at a ‘generic speaker’ level. Method: We compared 24 autistic eight- to eleven-year-olds with 24 well-matched neuro-typical controls. Children interpreted requests in contexts which would be ambiguous if perspective-taking were not utilized. In the interlocutor-specific perspective-taking condition, (...) the target was the particular object which was new for the speaker. Children needed to take into account what the speaker had played with before and the fact that they were now expressing excitement about something new. In two control ‘speaker-generic’ conditions we tested children’s ability to take the visual perspective of the speaker. Results: The autistic group were significantly less likely to select the target and significantly more likely to request clarification in the ‘interlocutor-specific’ condition. Performance in the ‘interlocutor-generic’ perspective taking conditions did not differ between groups. Conclusion: Autistic children, even those who are not intellectually-impaired, tend to have more difficulty than neuro-typical peers in comprehending referring expressions when this requires understanding that people comment on what is new for them. (shrink)

This commentary focuses on evidence from autism concerning the relation between metacognition and mindreading. We support Carruthers' rejection of models 1 (independent systems) and 3 (metacognition before mindreading), and provide evidence to strengthen his critique. However, we also present evidence from autism that we believe supports model 2 (one mechanism, two modes of access) over model 4 (mindreading is prior).

In response to Quinn we identify cladistics to be about natural classifications and their discovery and thereby propose to add an eighth cladistic definition to Quinn’s list, namely the systematist who seeks to discover natural classifications, regardless of their affiliation, theoretical or methodological justifications.