Efficacy of object manipulation and picture identification to teach single words was assessed with four 23- to 40-month-old language impaired children at sensorimotor development level. Among results: two children learned more nouns and verbs in object manipulation condition. (Author)

Examined whether the density of play continues to increase as children grow older. Four- and five-year-olds made simple constructions using few materials, six- and seven-year-olds made more constructions with more materials, and eight-to ten-year-olds made fewer but much more extensive and integrated constructions. (Author/DB)

Argues that the development of object perception in infancy involves the detection of structural invariants and that such detection is best understood in the context of dynamic events. (Author/MP)

The early phase of imitation was studied in children between 6 and 18 months by means of the presentation of 22 actions. (SB)

This study examined the relationship of crossing the midline while reaching for objects to the development of bimanual reaching among infants ages 12, 18, and 26 weeks. Findings indicated that the frequency of two-hand grabbing and the number of midline reaches increased with age; most midline reaches were part of two-handed reaches and occurred…

Mental rotation studies examine how subjects determine whether two stimuli differing in orientation have the same-handedness. Handedness recognition tasks require the subject to determine whether forms are identical, differing only in degree of angular displacement. Four experiments involving 160 undergraduates demonstrate that mental…

In 3 experiments, the authors investigated the impact of action goals on the production of discrete bimanual responses. Similar to a bartender putting 2 glasses simultaneously on a shelf, participants placed 2 objects into either parallel or opposite orientations by carrying out either mirror-symmetrical or mirror-asymmetrical movements. In…

In this study, a desktop virtual reality earth motion system (DVREMS) is designed and developed to be applied in the classroom. The system is implemented to assist elementary school students to clarify earth motion concepts using virtual reality principles. A study was conducted to observe the influences of the proposed system in learning.…

Although the role of memory in visual search is debatable, most researchers agree with a limited-capacity model of memory in visual search. The authors demonstrate the role of memory by replicating previous findings showing that visual search is biased away from old items (previously examined items) and toward new items (nonexamined items).…

Examines the manipulative strategies of 2- to 6-year-olds in terms of three structural principles--hierarchical complexity, interruption and role change--which are formally parallel to dimensions of language structure. Paper includes an extensive discussion of related studies. (JMB)

Children aged 2 1/2, 3, and 3 1/2 years who had demonstrated appropriate uses for a set of objects, were asked to perform these same actions with objects which varied in similarity in the reference object, or with no object present. (JMB)

In this article, the authors investigated how perturbing optical information affects the guidance of an unfolding hitting action. Using monocular and binocular vision, six participants were required to hit a rectangular foam object, released from two different heights, under four different approach conditions, two with object rotation (to perturb…

Infants aged 4 and 6 months were presented with events in which a person acted so as to set another person, or an inanimate object, in motion. In one condition, the actor spoke to the person (natural) or inanimate object (unnatural); in the other condition, the actor grasped and manipulated the person (unnatural) or object (natural). Six-month-old…