Hypnotic Validation of Two Hand Test Scoring Categories

When emotions of aggression and affection were hypnotically induced in seven college students, they produced corresponding increases on the Aggression and Affection scores of the Hand Test.     

Heart electrophysiology as a dependent measure in children

This study extends the cardiac component analysis technique, reported by Eddy and his coworkers (Eddy, McKendree, McKenzie, & Bremner, 1982; McKendree, 1982), to children. Three male children between the ages of 8 and 10 years served as subjects and were tested on several days. In particular, the children were taught a simple relaxation task and a simple cognitive task. The cardiac electrophysiology of these children was statistically tested to determine whether there was a reliable difference between psychological tasks but only minimal variance within psychological tasks. The results of testing the ST component of the cardiac electrophysiology confirmed our hypothesis that there is a statistical difference between tasks (p < .001) but not within tasks when tested over time.     

Posture and the emergence of manual skills

In this paper, we examine how infants’ natural manual and postural activities — what they prefer and do week by week — are related to developmental transitions in reaching skill and its neuromuscular control. Using a dense, longitudinal design, we tracked the manual and postural activities of four infants in a natural, free‐play setting across the first year of life, and related these activities to two transitions in reaching as measured in a structured laboratory setting: the transition to reaching and the transition to stable reaching. Our data indicated that specific advances in the free‐play setting preceded both transitions. Head and upper torso control, the ability to extend the arm and hand to a distant target, and the ability to touch and grasp objects placed nearby were all precursors to the onset of reaching, whereas sitting independently was associated with the transition to stable reaching. We also found important individual variability in when these ‘components’ were in place, indicating that it is the ensemble of components that is essential, not the order in which they develop or the timing of their contribution. These findings suggest that subsequent experimental manipulations should be planned with respect to infants’ individual constellations of skills, rather than looking at only a single precursor to change.     

Associations Between 3-Year-Olds' Narrative Co-Constructions with Mothers and Fathers and Their Story Completions About Affective Themes

Oral narratives are important developmental attainments for young children, and they provide them with a new mode for organizing personal experience. Narratives are not only individual constructions, however; they are also shaped and transformed b y parent–child transactions. In this study the relations between mother– and father–child co-constructions of a narrative involving emotional themes and the emotional organization of children's narratives obtained using the MacArthur Sto ry-Stem Battery (MSSB) were investigated. The results showed associations between both mother– and father–child co-constructions and children's MSSB narratives. In addition, the findings highlighted the dyadic aspects of co-constructions and t he importance of taking into consideration children's co-constructions with both parents.     

Maternal aggression toward infanticidal males of different social status in wild house mice (Mus musculus domesticus)

Maternal aggression was examined in wild female mice (Mus musculus domesticus) derived from animals trapped in Alberta, Canada. Lactating females were tested for their behavior toward intruder males during the time of postpartum estrus while housed in a two-cage apparatus containing a defensible nest area. Prior to being used as intruders, sexually naive males were screened for their behavior toward a newborn pup (83% exhibited infanticide). Only infanticidal males were then housed in pairs and allowed to establish a dominance hierarchy. Dominance status was further verified by a urine marking test. The dominant and subordinate infanticidal males were then placed into a lactating female's cage and observed for 1 hr. The test was terminated immediately when a male began to attack the pups. Lactating females attacked the males in both groups, but subordinate males received more intense attacks than dominant males. Dominant males elicited significantly more fear/defense behavior than subordinate intruders. All of the dominant males and only one submissive male attacked the pups. Females were thus successful in blocking infanticide only by infanticidal subordinate males. Since females do not persist in attacking males with high fighting ability, one function of maternal aggression could be to assess the fighting, and resource holding, potential of a future mate. © 1994 Wiley-Liss, Inc.     

Enhancement of perceptual representations by endogenous attention biases competition in response selection

Perception and response selection are core processes in the generation of overt behavior. Selective attention is known to facilitate behavioral performance by altering perceptual processes. It remains unclear, however, whether selective attention can aid the resolution of response conflict, and if so, at what stage of processing this takes place. In two experiments, an endogenous cuing task was combined with a flanker task to assess the interaction of selective attention with response selection. The results of Experiment 1 show that cuing reduces the flanker-congruency effect when the cue and flanker are presented in close temporal proximity to each other. The results of Experiment 2 demonstrate that pre- but not post-cuing the target reduced the congruency effect, showing that selective attention can affect performance, but is ineffective once stimulus processing has proceeded to response selection. Our results provide evidence that selective attention can aid the resolution of response conflict by altering early perceptual processing stages.