Splitting as a predictor of depression.

146 university students completed measures of splitting, depression, and self-esteem. Splitting was positively correlated with depression and negatively related to self-esteem.     

Joint action and group action made precise

The paper argues that there are two main kinds of joint action, direct joint bringing about (or performing) something (expressed in terms of a DO-operator) and jointly seeing to it that something is the case (expressed in terms of a Stit-operator). The former kind of joint action contains conjunctive, disjunctive and sequential action and its central subkinds. While joint seeing to it that something is the case is argued to be necessarily intentional, direct joint performance can also be nonintentional. Actions performed by social groups are analyzed in terms of the notions of joint action (basically DO and Stit).A precise semantical analysis of the aforementioned kinds of joint action is given in terms of time-trees. With each participant a tree is connected, and the trees are joined defining joint possible worlds in terms of state-expressing nodes from the trees. Sentences containing DO and Stit are semantically evaluated with respect to such joint possible worlds. Intentional joint actions are characterized in terms of the notion of we-intention (joint intention), characterized formally by means of a special operator.     

Social interaction and the development of cognitive operations

This paper presents two experiments to support the general hypothesis that the coordination of actions between individuals promotes the acquisition of cognitive coordinations. The first experiment shows that two children, working together, can successfully perform a task involving spatial coordinations; children of the same age, working alone, are not capable of performing the task. The second experiment shows that subjects who did not possess certain cognitive operations involved in Piaget's conservation of liquids task acquire these operations after having actualized them in a social coordination task.     

Relationships between academic intrinsic motivation and anxiety in children and young adolescents

To test the hypothesis that academic intrinsic motivation and anxiety are negatively related when both are differentiated into academic subject areas, two self-report inventories measuring academic intrinsic motivation and anxiety were administered to fourth and seventh graders. Each inventory was differentiated into the subject areas of reading, math, social studies, and science to determine whether the relationship between academic intrinsic motivation and anxiety would vary according to subject area. The results supported the hypothesis and showed that the relationship is differentiated according to subject area. Fourth and seventh graders differed in the pattern of relationships. For seventh graders, negative correlations between academic intrinsic motivation and anxiety occurred only within corresponding subject areas, while for fourth graders the negative correlations occurred both within corresponding and between noncorresponding subject areas. Implications for assessment and school intervention are advanced.     

Instrumentation for an electrocutaneous communication device

The device described is a prototype that uses spatiotemporal resolution for electrocutaneous stimulation. Signals initiated through a keyboard activate a matrix of four electrodes that may be applied to the fingers, forearm, abdomen, back, or other parts of the integument. The instrumentation described includes a pulse generator, the active time and delay time controls, the control of the total length of a pulse train, and the constant-current generators whose output is fed into the electrodes. This device may be used as an interface with an alphanumeric device (e.g., a calculator or computer) and as a basic instrument in research investigating the spatial and temporal resolving capacities of the skin senses.     

Neonatal sex and birth-order effects on behaviors of mothers and temporary caretakers during bottle-feeding

This study examined the effects of neonatal sex and birth order on maternal caretaking patterns for pre-attachment behaviors shown by mothers and instrumental behaviors seen in both mothers and temporary caretakers. Observational category scores were obtained for mothers of 20 newborn infants and for temporary caretakers observed in a 15 min bottle-feeding situation. A repeated measures analysis of variance design was used to partition categories into caretaking classifications and to evaluate the effects of infant sex and birth order. Significant main effects for caretaker (p less than .05) were obtained: six mother-high, pre-attachment categories, and seven mother-low, instrumental behavior categories. Maternal scores sensitive to infant sex and birth order were identified from Caretaker x Sex x Birth Order interactions (p less than .05). Birth order differences affected maternal behaviors directed toward sons more substantially than those directed toward daughters. Mothers held first-born sons upright in tactual contact with the trunk, whereas daughters were held supine on the lap and exposed to frequent maternal smiling.