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281.
The current study investigated the development of online reach control. Six- and 11-month-old infants reached for a toy while their hand position was tracked. The toy either remained stationary (baseline trials) or unexpectedly displaced left- or rightward during the reach (perturbation trials). To obtain a measure of online reach correction, we compared reaches in the perturbation trials to reaches in baseline trials using autoregression analysis. Infants of both age groups adjusted their reach trajectories in the direction of the displacement. Moreover, we divided the reaching movements into movement units, defined as the submovements of a reach between local minima in hand speed. Eleven-month-old infants adjusted their reach within the span of a single movement unit; corrections in 6-month-olds spanned multiple movement units. These results suggest that the reach control system has a rudimentary replanning capacity by 6 months of age, which, with age, further develops to a more sophisticated online control mechanism for ongoing reaches. 相似文献
282.
‘Theory’ is a seminal term in sociology. Sociologists tend to ask that articles, chapters and monographs are ‘theoretical’, ‘develop theory’ or ‘make a theoretical contribution’. Yet, as demonstrated in Gabriel Abend’s 2008 article ‘The Meaning of ‘Theory’, it is generally unclear what sociologists mean when they talk about theory. Abend distinguishes seven different meanings sociologists tend to impute to ‘theory’ and argues that no single definition can usefully capture these substantively different meanings. Counter to Abend, we propose and defend a minimal and versatile theory of theory, which does capture the important common denominators in sociologists' various uses of the term theory. The major strengths of our proposal are that it enables informed and synthetic discussion and fosters reflexivity about differences and similarities between different types of theory. Our minimal theory of theory thus serves as an invitation to a broader conversation about theory in sociology. 相似文献
283.
Erik O. Kimbrough Alexander Vostroknutov 《Journal of the European Economic Association》2016,14(3):608-638
We explore the idea that prosocial behavior in experimental games is driven by social norms imported into the laboratory. Under this view, differences in behavior across subjects is driven by heterogeneity in sensitivity to social norms. We introduce an incentivized method of eliciting individual norm‐sensitivity, and we show how it relates to play in public goods, trust, dictator, and ultimatum games. We show how our observations can be rationalized in a stylized model of norm‐dependent preferences under reasonable assumptions about the nature of social norms. Then we directly elicit norms in these games to test the robustness of our interpretation. 相似文献