The dentate gyrus (DG) subregion of the hippocampus has been shown to be involved in encoding but not retrieval in a spatial maze task (modified Hebb-Williams maze). The first experiment in this study examined whether a lesion to the CA3 would contribute to a similar encoding deficit. A DG group was included in order to replicate previous results.…

The transcription factor cAMP response-element binding protein (CREB) has a pivotal role in hippocampal synaptic plasticity and hippocampus-dependent long-term memory. We recently demonstrated that the dorsal hippocampal CA3 region is involved in memory consolidation of spatial information tested on a Morris water maze in mice. To test whether…

Five theories of how letter position is coded are contrasted: position-specific slot-coding, Wickelcoding, open-bigram coding (discrete and continuous), and spatial coding. These theories make different predictions regarding the relative similarity of three different types of pairs of letter strings: substitution neighbors,…

Spatial skills are known to vary widely among normal individuals. This project was designed to address whether these individual differences are differentially related to large-scale environmental learning from route (ground-level) and survey (aerial) perspectives. Participants learned two virtual environments (route and survey) with limited…

In contextual cueing, the position of a target within a group of distractors is learned over repeated exposure to a display with reference to a few nearby items rather than to the global pattern created by the elements. The authors contrasted the role of global and local contexts for contextual cueing in naturalistic scenes. Experiment 1 showed…

Faces are perceived holistically, a phenomenon best illustrated when the processing of a face feature is affected by the other features. Here, the authors tested the hypothesis that the holistic perception of a face mainly relies on its low spatial frequencies. Holistic face perception was tested in two classical paradigms: the whole-part…

Four experiments investigated the nature of spatial representations used in locomotion. Participants learned the layout of several objects and then pointed to the objects while blindfolded in 3 conditions: before turning (baseline), after turning to a new heading (updating), and after disorientation (disorientation). The internal consistency of…

To identify the role of the child's own action in the development of the ability to coordinate perspectives, a spatial localization task was presented to 2 groups of children: 16 children between 18 and 24 months old, and 16 children between 42 and 48 months old. A reward was hidden randomly in one of two identical left-right locations on a…

This paper highlights issues concerning the relationship between spatial reasoning and gender differences. It is noted that spatial reasoning can take on many different forms of expression, from geometric formations to abstract expressive creations. The definition of spatial reasoning for research purposes has been limited to a logical concept of…

Recent research has demonstrated that spatial memory in young and elderly adults depends upon the context in which items to be remembered are placed. Contexts in which cues to location are distinctive and heterogeneous have been found to be associated with better object location memory for both age groups. In this study, the relative contributions…

This monograph contains two studies in which the notion of intelligence as one general basic ability is rejected and in its place is posited the existence of a specific type of mental ability described as "spatial intelligence.""Spatial Reasoning and Its Measurement" investigates the process of spatial reasoning in the adult through an analysis of…

As the viewer watches the opening credits for the program "Entertainment Tonight," the screen comes to life with rotating shapes and spinning geometric patterns. One has the sense of travelling on an imaginary voyage through space. Many of the computer generated displays common now on television use such visual devices as linear perspective,…

Sixty-eight learning disabled and reading disabled junior high school-aged youths participated in two experiments regarding use of spatial organizers to increase prose recall. In Experiment 1, learners were required to study either a spatially organized illustration or a randomized (list format) illustration prior to hearing a related prose…

An experiment was conducted to test the hypothesis (derived from Piaget's theory of cognitive development) that the structure of children's drawings and play-constructions, being expressions of the same underlying function, should be similar. Two groups of 4- and 6-year-old nursery school children were given a testing task consisting of an orally…

Data obtained under naturalistic conditions do not support the notion of a close fit between the growth of geometric concepts during the concrete operational period and "realism" in art. Realism here refers to the ability to portray the objective proportions of a figure, to coordinate spatial relations and distances, and to represent a…