Previous research has shown indirectly that infants may use two different mechanisms-an object tracking system and an analog magnitude mechanism--to represent small (less than 4) and large (greater than or equal to 4) numbers of objects, respectively. The current study directly tested this hypothesis in an ordinal choice task by presenting 10- to…

Previous studies have suggested that younger preschoolers exhibit a yes bias due to underdeveloped cognitive abilities, whereas older preschoolers exhibit a response bias due to other factors. To test this hypothesis, we investigated the response latency to yes-no questions pertaining to familiar and unfamiliar objects in 3- to 6-year-olds. The…

Several models assume that working memory development depends on age-related increases in efficiency and speed of processing. However, age-related increases in the efficiency of the mechanisms that counteract forgetting and restore memory traces may also be important. This hypothesis was tested in three experiments by manipulating both the…

Behavioral, psychophysiological, and neuropsychological studies have revealed large developmental differences in various learning paradigms where learning from positive and negative feedback is essential. The differences are possibly due to the use of distinct strategies that may be related to spatial working memory and attentional control. In…

What does it mean for a child to imitate someone else? We tested matched groups of children with and without autism (n = 16 for each group, with a mean chronological age of 11 years and a mean verbal mental age of 6 years) to investigate two potentially dissociable aspects of imitation: copying goal-directed actions, on the one hand, and imitating…

Child development is accompanied by a robust increase in immediate memory. This may be due to either an increase in the number of items (chunks) that can be maintained in working memory or an increase in the size of those chunks. We tested these hypotheses by presenting younger and older children (7 and 12 years of age) and adults with different…

Two experiments examined children's metacognitive monitoring of recognition judgments within an eyewitness identification paradigm. A confidence-accuracy (CA) calibration approach was used to examine patterns of calibration, over-/underconfidence, and resolution. In Experiment 1, children (n=619, mean age=11 years 10 months) and adults (n=600)…

This study tests the hypothesis that dyslexia and dyscalculia are associated with two largely independent cognitive deficits, namely a phonological deficit in the case of dyslexia and a deficit in the number module in the case of dyscalculia. In four groups of 8- to 10-year-olds (42 control, 21 dyslexic, 20 dyscalculic, and 26…

This study investigated young children's reports of when learning occurred. A total of 96 4-, 5-, and 6-year-olds were recruited from suburban preschools and elementary schools. The children learned an animal fact and a body movement. A week later, children learned another animal fact and another body movement and then answered questions about…

A total of 28 children were tested for comprehension of spatial antonym pairs with arrays which contained four objects representing both members of two antonym pairs. The results supported a modified semantic-feature hypothesis, in which polarity is acquired before dimension. (Author/LLK)

This study examined age-related differences in functional learning performance manifested among children, adolescents, and young adults placed in a two-cue ecology involving cues with direct relation and inverse relations with the criterion. On each trial, participants were instructed to consider the values taken by two cues, predict from these…

Thirty kindergarten children in three sessions performed a lever-pulling task under three partial reinforcement conditions. The results of the experiment demonstrated that both recency and summation of nonreward influenced performance as measured by latency. Based in part on a Master's Thesis submitted bu the first author in partial fullfillment…

Strategies of kindergarten children in discrimination learning were studied in a factorial design with temporal placements of two introtact probes and two types of pretraining. Results support the expectation that the posttrial probe would improve the short-term efficiency of children in both pretraining conditions. (Author/MP)

A specially designed discrimination learning task was used to investigate whether the performance of kindergarten and first grade children could be improved through explicit training with a simple hypothesis-testing strategy. (Author/MP)