Toddlers' Social Behaviors in Dyads and Groups

Although toddlers are clearly capable of interacting with peers, the amount and type of interactions among toddlers is controversial. Objectives of the present study were (a) to determine the effect of dyad versus group settings on the amount and type of social behaviors with peers, (b) to determine preference for interacting with peers versus adults, and (c) to determine differences in the types of behaviors directed to peers and adults. Sixteen children (with a mean age of 27 months) were observed in both a group setting and a dyad setting; their mothers were present in both settings. The children were from three different toddler classes, each meeting once a week. Specific social behaviors were coded, as well as the person to whom the behavior was directed (i.e., peer or adult). Setting affected toddlers' behaviors with adults but not behaviors with peers. Regardless of setting, toddlers preferred interacting with adults. The types of behaviors directed to peers and adults differed. Direct interactions with peers were rare, but interest and awareness of peers was shown by moderately high levels of proximity and parallel play. The use of different criteria to define social play appears to account for differences across studies in the amount of peer interaction.     

Movement Related EMGs Become More Variable During Learning of Fast Accurate Movements

Human subjects performed simple flexion and extension movements about the elbow in a visual step-tracking paradigm. Movements were self-terminated. Subjects were instructed to increase movement velocity while maintaining end-point accuracy during practice. The effects of practice on the pattern and variability of EMG activity of the biceps and triceps muscles were studied. Initial movements were performed using reciprocal phasic activation of agonist and antagonist muscles as indicated by surface EMGs. With practice, increases in movement speed were associated with larger agonist and antagonist bursts and an earlier onset of the antagonist burst. Decreased duration of the premovement antagonist silence was also observed during practice.

Decreases in variability of movements during practice were not accompanied by equivalent decreases in variability of the associated EMGs. Surprisingly, both agonist and antagonist EMGs were more variable in faster, practiced movements. The combined agonist-antagonist EMG variability depended on both movement speed and trajectory variability. Lower variability in movements in the presence of greater variability in the related EMGs occurred because of linked variations in agonist and antagonist muscle activities. Variations in the first agonist burst were often compensated for by associated variations in the antagonist and late agonist bursts. These linked variations maintained the limb trajectory relatively constant in spite of large variations in the first agonist burst. Modifications to impulse-variability models are therefore needed to explain compensations for variability in accelerative impulses (produced by the first agonist burst) by linked variations in impulses for deceleration (produced by the antagonist and late agonist bursts).     

The Relationships among Reported Strategy Use,Metacognitive Awareness,and Reading Achievement of High School Students

The metacognitive awareness and reading strategy use of high school students enrolled in two high schools were investigated. The correlations between reading scores and strategy use were examined as well as the variation in strategy use by self-rated reading proficiency and academic grades. The factor analysis revealed four factors on the Metacognitive Awareness of Reading Strategies Inventory: Metacognitive Awareness Strategies, Text-Based Strategies, Reading Process Strategies, and Predicting Strategies. Reading Process Strategies were most preferred by participants, whereas Text-Based Strategies were least preferred. A statistically significant difference in strategy use was found for reading achievement, self-rated reading proficiency, and grade level.     

Finding a New Voice

This article describes a clinical moment in the analysis of a traumatized woman, in which specifically identified, subjectively felt pressures and analytic considerations, informed by the maturation process of analytic training, resulted in a change in my theoretical orientation. It may be surmised that this changing of theories is a process that applies not only to candidates but also to mature analysts, as new theories continue to emerge and develop in the psychoanalytic field.     

Action video game playing is associated with improved visual sensitivity, but not alterations in visual sensory memory

Action video game playing has been experimentally linked to a number of perceptual and cognitive improvements. These benefits are captured through a wide range of psychometric tasks and have led to the proposition that action video game experience may promote the ability to extract statistical evidence from sensory stimuli. Such an advantage could arise from a number of possible mechanisms: improvements in visual sensitivity, enhancements in the capacity or duration for which information is retained in visual memory, or higher-level strategic use of information for decision making. The present study measured the capacity and time course of visual sensory memory using a partial report performance task as a means to distinguish between these three possible mechanisms. Sensitivity measures and parameter estimates that describe sensory memory capacity and the rate of memory decay were compared between individuals who reported high evels and low levels of action video game experience. Our results revealed a uniform increase in partial report accuracy at all stimulus-to-cue delays for action video game players but no difference in the rate or time course of the memory decay. The present findings suggest that action video game playing may be related to enhancements in the initial sensitivity to visual stimuli, but not to a greater retention of information in iconic memory buffers.     

Putting the pieces together: Maternal depression,maternal behavior,and toddler helplessness

This study assessed relations between maternal depression, maternal behavior, and helplessness in toddlers. Helplessness was assessed behaviorally in 25‐ and 32‐month‐old toddlers while the toddlers were engaged with an impossible task. Maternal behavior (warmth, negativity, control, intrusiveness) was assessed during a mother–child teaching task when toddlers were 18 and 25 months of age. Mothers who reported more depressive symptoms on the BDI had 32‐month‐old toddlers who displayed more affect‐related helplessness. No direct relations were found between maternal diagnosis of depression and helplessness in toddlers. Few differences emerged in the behavior of depressed and nondepressed mothers while interacting with their toddlers, and few relations were found between maternal behavior alone and toddlers' helplessness. However, results suggest that maternal behavior moderates the relation between maternal depression (diagnosis, recency, and symptoms) and helplessness. ©2003 Michigan Association for Infant Mental Health.     

The effect of corpus size in predicting reaction time in a basic word recognition task: Moving on from Kučera and Francis

Word frequency is one of the strongest determiners of reaction time (RT) in word recognition tasks; it is an important theoretical and methodological variable. The Ku?era and Francis (1967) word frequency count (derived from the 1-million-word Brown corpus) is used by most investigators concerned with the issue of word frequency. Word frequency estimates from the Brown corpus were compared with those from a 131-million-word corpus (the HAL corpus; conversational text gathered from Usenet) in a standard word naming task with 32 subjects. RT was predicted equally well by both corpora for high-frequency words, but the larger corpus provided better predictors for low- and medium-frequency words. Furthermore, the larger corpus provides estimates for 97,261 lexical items; the smaller corpus, for 50,406 items.