Two experiments investigated the role of spatial prototypes in estimates of location. Found that adults and children ages 7 to 11 years overestimated distances between target locations in different regions and that none displaced objects toward the region centers. Even with boundaries removed during testing, adults and children overestimated…

The retrieval of temporal-order versus spatial-location information was investigated using fMRI. The primary finding in the hippocampus proper, seen in region of interest analyses, was an increase in BOLD signal intensity for temporal retrieval, and a decrease in signal intensity for spatial retrieval, relative to baseline. The negative BOLD…

This study examined the role of stimulus characteristics in a visuospatial order reconstruction task in which participants were required to recall the order of sequences of spatial locations. The complexity of the to-be-remembered sequences, as measured by path crossing, path length, and angles, was found to affect serial memory, in terms of both…

What type of mental representation underlies the gestures that accompany speech? We used a dual-task paradigm to compare the demands gesturing makes on visuospatial and verbal working memories. Participants in one group remembered a string of letters (verbal working memory group) and those in a second group remembered a visual grid pattern…

Emerging areas and critical problems related to computer-based testing are identified. Topics covered include adaptive testing; calibration; item selection; multidimensional items; uses of information processing theory; relation to cognitive psychology; and tests of short-term and spatial memory, perceptual speed and accuracy, and movement…

The present study focuses on math and related skills among 32 girls with fragile X (n = 14) or Turner (n = 18) syndrome during late elementary school. Performance in each syndrome group was assessed relative to Full Scale IQ-matched comparison groups of girls from the general population (n = 32 and n = 89 for fragile X syndrome and Turner…

[alpha]CaMKII[superscript T286A] mutant mice lack long-term potentiation (LTP) in the hippocampal CA1 region and are impaired in spatial learning. In situ hybridization confirms that the mutant mice show the same developmental expression of [alpha]CaMKII as their wild-type littermates. A simple hypothesis would suggest that if LTP is a substrate…

The performance of deaf children with cochlear implants was assessed using measures standardized on hearing children. To investigate nonverbal cognitive and sensorimotor processes associated with postimplant variability, five selected sensorimotor and visuospatial subtests from "A Developmental Neuropsychological Assessment" (NEPSY) were compared…

This study examines 4-year-olds' ability to search and find a missing object, a complex problem-solving task dependent on remembering events, logically deducing the possible subset of hiding places, and implementing situation-dependent search strategies. Sixty-four children recruited from two day care centers in a small midwestern city searched…

Infants 9 to 10 months of age were presented with a series of visible displacement hiding trials at two locations. Infants had to choose among three, five, or six alternative locations on each trial. Search attempts tended to cluster around the currently correct location during both trials on all apparati, providing evidence for a memory…

Three studies investigated how experiencing nearby locations together in time influenced memory for location in 7-, 9-, and 11- year-olds and adults. Findings suggested that experiencing nearby locations together in time increased the weight children assigned to categorical information in their later estimates of location. Results were similar…

Found that faulty test procedures may explain why infants sometimes locate hidden objects more easily in multiple-well tests than in two-well trials. Also found that errors in seven-well tests were not evenly distributed but occurred disproportionately in the direction of the previously correct well, suggesting that memory and inhibition are both…

Five experiments tested hypothesis that the A-not-B error results from general processes that make goal-directed actions to remembered locations. Findings showed that 2-year-olds' performance on the A trial was accurate. When the object was hidden at Location B, searches after 10-second delay were biased in the direction of Location A. This bias…

Used a dual-task method to study the processes that underlie the flexible conjunction of information. Results of four experiments, involving 16, 36, 12, and 16 college students and adults suggest that flexible spatial memory depends on the ability to combine diverse information sources rapidly into unitary representations. (SLD)

This study investigated memory from interrupted visual searches. Participants conducted a change detection search task on polygons overlaid on scenes. Search was interrupted by various disruptions, including unfilled delay, passive viewing of other scenes, and additional search on new displays. Results showed that performance was unaffected by…