Expansion of query keywords based on semantic relations is an effective approach to improve the performance of information retrieval. Traditional methods of query expansion did not adequately make use of semantic relations between query keywords. In this paper, a novel approach for query expansion is presented. The main idea of the approach is to construct a ‘Tree of Associational Semantics Mod...

Recognition memory requires judgments of the previous occurrence of stimuli made on the basis of the relative familiarity of individual objects, or by integrating information concerning objects and location, or by using recency information. The present study examined the role of the medial prefrontal cortex (mPFC) and perirhinal cortex (PRH) in these distinct recognition memory processes using ...

Indirect biotic effects arising from multispecies interactions can alter the structure and function of ecological communities--often in surprising ways that can vary in direction and magnitude. On Pacific coral reefs, predation by the crown-of-thorns sea star, Acanthaster planci, is associated with broad-scale losses of coral cover and increases of macroalgal cover. Macroalgal blooms increase c...

The piriform cortex (PC), like other cortical regions, normally operates in a state of dynamic equilibrium between excitation and inhibition. Here we examined the roles played by pre- and postsynaptic GABAB receptors in maintaining this equilibrium in the PC. Using whole-cell recordings in brain slices from the anterior PC of mice, we found that synaptic activation of postsynaptic GABAB recepto...

Family and Gang as Agents of Socialization The family, conceived primarily as a child-rearing agency, and the gang, defined in some detail in the last chapter, were both prevalent forms of associational units in Midcity. It is important to repeat at this point that the term “family” as used in the present work refers to that kinship-based associational unit which bears primary responsibility fo...

Gonadal hormones are known to broadly influence cortical information processing. Findings from this study in rats suggest that for androgens, this influence may include stimulation of underlying corticocortical connections. First, immunoreactivity for intracellular androgen receptors, while present in all regions and layers examined, was found to be particularly abundant in sensory and motor re...