This paper presents GTD-POP, a planning methodology based on the Generate, Test and Debug paradigm. GTD-POP’s goal is to achieve a compromise between planning efficiency and soundness by using associational knowledge to guide its search for interaction checks in a partially-ordered plan. This paper describes the GTD-POP and discusses issues involved in evaluating the behavior of practical plann...

Although it has been recognized for some years that each cytoarchitectonic field of Ammon's horn and the subiculum gives rise to a specific pattern of cortical and subcortical projections, it has not been clear whether these various projections arise from different populations of neurons within each field or whether they arise as collaterals from an essentially homogeneous population of cells. ...

IN 1942, Dempsey and Morison (4-6, 24) discovered in cats a thalamic system which upon direct repetitive stimulation evoked recruiting wave responses in broad areas of the cortex. Evidence was presented that the physiological counterpart of this response to stimulation was burst or spindle activity recorded from the cortex of cats under surgical barbiturate anesthesia. Interest in the mechanism...

Pure neuroectodermal growth was obtained from the retina of the chicken embryo by removing the pecten before preparation of the cultures. Retinal tissue was cultured either as explants in plasma clots or as isolated cells after trypsinization. Epithelial cells formed sheets on which the other retinal cells grew. Horizontal cells maintained the associational characteristics. Development of photo...

Patterns of herbivory may vary with fine-scale plant community structure: the degree of damage plants experience may depend on their neighbors (i.e., associational resistance or susceptibility). Differential herbivory, in turn, may facilitate a shift in plant community structure. We investigated these reciprocal effects of plant community structure and insect herbivory in a field mesocosm exper...

Fiber volleys (FVs) from the stratum lucidum of rat hippocampal area CA3 were recorded extracellularly from in vitro slices in the presence of 10 mM kynurenic acid. In agreement with previous work, bulk stimulation of the dentate gyrus (DG) near the hilar border leads to an asynchronous FV. Transection of the stratum lucidum between the DG stimulation site and the CA3 recording site reduced or ...