Visual short-term memory in the first year of life: capacity and recency effects.

A span task was developed to assess the amount of information infants could hold in short-term memory. In this task, infants were presented with up to 4 items in succession and then tested for recognition by successively pairing each item with a novel one. A large sample of full-terms and low-birth-weight preterms (< 1,750 g) was tested longitudinally, at 5, 7, and 12 months of age. Results were similar for both groups: (a) Longer spans were more difficult, especially at the 2 younger ages; (b) memory capacity increased over the 1st year of life--whereas less than 25% of the sample could hold as many as 3-4 items in mind at once at the younger ages, nearly half could do so by 12 months of age; (c) there was a marked recency effect (greater memory for the final item) for spans of 3 and 4 at all ages; and (d) there were modest cross-age correlations, indicating that individual differences in memory capacity showed some stability from age to age.     

Foucault's concept of illegalism

This paper reconstructs Foucault's concept of illegalism and explores its significance for his genealogies of modern punishment and racial formation. The concept of illegalism, as distinct from illegality, plays a double role. It allows Foucault to describe a ruling class tactic for managing inequalities and also to characterize an important vein of resistant subjugated knowledges. The political project of the prison is linked to a new crime policy that does not so much aim to repress illegalisms as to manage them differentially. This practice of differential management, which arises in the 18th century, produces a primary split along class lines between two types of illegalism—an insight that has a certain resonance with Edwin's Sutherland's concept of “white collar crime.” Foucault's investigation of a third category of “infralegal illegalism” sheds light not only on the genealogy of the category of delinquency but also on his genealogy of racial categorization. Finally, Foucault argues that a genuinely radical critique of modern society must address the “need” organized political power has for the illegalisms from which it purportedly seeks to protect society. Against this practice of differentially managing illegalisms, Foucault seeks to reactivate a subjugated problematic that might open up questions about the transformative possibilities of illegalism today.     

Control of Trajectory Modifications in Target-Directed Reaching

Human reaching movements to fixed and displaced visual targets were recorded and compared with simulated movements generated by using a two-joint arm model based on the equilibrium-point (EP) hypothesis (λ model) of motor control (Feldman, 1986). The aim was to investigate the form of central control signals underlying these movements. According to this hypothesis, movements result from changes in control variables that shift the equilibrium position (EP) of the arm. At any time, muscle activations and forces will depend on the difference between the arm's EP and its actual position and on the limb's velocity. In this article, we suggest that the direction of EP shift in reaching is specified at the hand level, whereas the rate of EP shift may be specified at the hand or joint level. A common mechanism underlying reaching to fixed and displaced targets is proposed whereby the EP of the hand shifts in a straight line toward the present target. After the target is displaced, the direction of the hand EP shift is modified toward the second target. The results suggest that the rate of shift of the hand EP may be modified for movements in different parts of the work space. The model, with control signals that vary in a simple fashion over time, is able to generate the kinematic patterns observed empirically.     

Early Postpartum Parental Preoccupation and Positive Parenting Thoughts: Relationship with Parent–Infant Interaction

Parenting behaviors and parent–infant emotional bonding during the early postpartum months play a critical role in infant development. However, the nature and progression of parental thoughts and their relationship with interactive behaviors have received less research. The current study investigated the trajectory of parental thoughts and behaviors among primiparous mothers (n = 18) and fathers (n = 15) and multiparous mothers (n = 13) and fathers (n = 13), which were measured at the first and third postpartum month. At the third postpartum month, the relationship between parental thoughts and parental interactive behaviors also was tested. Mothers and fathers showed high levels of preoccupations and caregiving thoughts during the first postpartum month that significantly declined by the third postpartum month. In contrast, positive thoughts about parenting and the infant increased over the same time interval. Mothers presented higher levels of preoccupations and positive thoughts than did fathers, and first‐time parents reported more intense preoccupations than did experienced parents. Although maternal sensitivity was inversely related to maternal anxious thoughts, paternal sensitivity was predicted by higher levels of anxious as well as caregiving and positive thoughts.