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4bstract Isosurfaces we an important tool for finding features in 3D solar dam ~s paper describes how recursive contour mesh-tig is apptied to extract similar features in 4dimensionsd spare. h tie case of time-varying isosurfaces f(x, y, ~, t) = c, tie technique cons~cts a sofid mesh for tie isosurface that sweeps a volume in space-time. h instance of an(More)
This paper describes a texture generation technique that combines orientation and luminance to support the simultaneous display of multiple overlapping scalar fields. Our orientations and luminances are selected based on psychophysical experiments that studied how the low-level human visual system perceives these visual features. The result is an image that(More)
The distribution of substance P-, leucine-enkephalin-, tyrosine hydroxylase-, and serotonin-like immunoreactivities was studied in the forebrain of the silver lamprey and compared to other vertebrate groups. In silver lampreys, substance P and leucine-enkephalin provide a clear distinction between the pallium and subpallium as they do for gnathostomes. The(More)
The need to compare surfaces occurs frequently in many scientific pursuits. Local comparisons can be quite difficult when the surfaces are placed side-by-side. But the two surfaces may intersect in complex ways if overlaid. Techniques have been previously developed for visualizing nested surfaces. The most successful of these apply opacity-modulated texture(More)
Large datasets typically contain coarse features comprised of finer sub-features. Even if the shapes of the small structures are evident in a 3D display, the aggregate shapes they suggest may not be easily inferred. From previous studies in shape perception, the evidence has not been clear whether physically-based illumination confers any advantage over(More)
ImageSurfer is a tool designed to explore correlations between two 3D scalar fields. Our scientific goal was to determine where a protein is located, and how much its concentration varies along the membrane of a neuronal dendrite. The 3D scalar field data sets fall into two categories: dendritic plasma membranes (defining the structure) and(More)
Commercial eye-gaze trackers have the potential to be an important tool for quantifying the benefits of new visualization techniques. The expense of such trackers has made their use relatively infrequent in visualization studies. As such, it is difficult for researchers to compare multiple devices – obtaining several demonstration models is impractical in(More)
We have developed a real-time experiment-control and data-display system for a novel microscope, the 3D-Force Microscope (3DFM), which is designed for nanometer-scale and nanoNewton-force biophysical experiments. The 3DFM software suite synthesizes the several data sources from the 3DFM into a coherent view and provides control over data collection and(More)
This study in lampreys (Lampetra fluviatilis L.) is concerned with the phylogenetic age of the suprachiasmatic nucleus of the hypothalamus which in mammals receives input from the retinohypothalamic tract and acts as circadian pacemaker. Tracing experiments with the fluorescent dye DiI demonstrated a retinohypothalamic projection in lampreys which(More)