Mental Rotation of Dynamic,Three‐Dimensional Stimuli by 3‐Month‐Old Infants

Mental rotation involves transforming a mental image of an object so as to accurately predict how the object would look if it were rotated in space. This study examined mental rotation in male and female 3‐month‐olds, using the stimuli and paradigm developed by Moore and Johnson (2008) . Infants were habituated to a video of a three‐dimensional object rotating back and forth through a 240° angle around the vertical axis. After habituation, infants were tested both with videos of the same object rotating through the previously unseen 120° angle, and with the mirror image of that display. Unlike females, who fixated the test displays for approximately equal durations, males spent significantly more time fixating the familiar object than the mirror‐image object. Because familiarity preferences like this emerge when infants are relatively slow to process a habituation stimulus, the data support the interpretation that mental rotation of dynamic three‐dimensional stimuli is relatively difficult—but possible—for 3‐month‐old males. Interpretation of the sex differences observed in 3‐ and 5‐month‐olds’ performances is discussed.     

Differential Frontal Cortex Activation Before Anticipatory and Reactive Saccades in Infants

Neural correlates of anticipatory and reactive saccades were studied in 4‐month‐old infants by recording high‐density event‐related potentials. Infants were presented with a fixed sequence of stimulus presentation to which they rapidly showed anticipatory saccades, as well as continuing with some reactive (stimulus‐driven) saccades. As in a previous study, no clear evidence was found for adultlike, saccade‐related potentials, although some presaccadic differences between reactive and anticipatory saccades were observed. Infants also showed different stimulus offset‐related effects preceding the 2 types of trials with a right‐frontal positivity when an anticipatory look follows, but only left‐frontal positivity when a reactive saccade follows.     

Validation of a Multi‐Dimensional Measure of Strategy Development Processes

In this paper, we present evidence on the measurement properties of an instrument that assesses six dimensions of organizational strategy development. These dimensions are labelled planning, incrementalism, cultural, political, command and enforced choice. Using data from 5332 managers, results indicate the instrument has acceptable reliability and validity. Exploratory factor analysis confirms its underlying structure. Generally, the sub‐scales have acceptable internal reliability and inter‐rater reliability at the organizational level (n = 770 organizations). Further, using data aggregated at the organizational level, the sub‐scales are judged to have acceptable validity from the pattern of correlations amongst the six dimensions and with other variables.     

The importance of survival units for Norbert Elias's figurational perspective

In this paper, we argue that Norbert Elias's concept of survival unit is a distinctive part of the development of his figurational sociology and one of the most consistent contributions to relational thinking. The survival unit is a particular form of figuration which provides security and the material foundations for life such as food and shelter. Every human being is born into a survival unit. This unit is a relational concept which cannot be conceived outside a relationship with other survival units.
By introducing the concept of survival unit Elias overcomes one of the key problems in relational sociology: how to demarcate primary social relations. Elias argues that human societies from very early on have been divided into survival units. These survival units are demarcated and constituted in their relationship to other survival units. Consequently, their boundaries are generated in a confrontation with other survival units.
This relationship can be peaceful or conflict ridden but in the last resort it can end with violent confrontation. Only the survival unit with the ability to defend a domain of sovereignty will survive. This observation places Elias among the few sociologists with an understanding of the role of warfare in social relationships.