Creating noisy stimuli

So much noise. A method for creating a variety of pseudo-random `noisy’ stimuli that possess several useful statistical and phenomenal features for psychophysical experimentation is outlined. These stimuli are derived from a pseudo-periodic function known as multidimensional noise…. Read More

Perceptual representation of visible surfaces

What is a surface, anyway? Two experiments are reported in which we examined the ability of observers to identify landmarks on surfaces from different vantage points. In Experiment 1, observers were asked to mark the local maxima and… Read More

Shape metrics

Glaven Object Files

Glaven 13

I’ve posted the Glaven STL and OBJ object files in the¬†Software, Data & Geometry¬†section. Go have a look and let me know if you use them or even download them for that matter.

A day of problem solving pictures.

One of the things I love about using Mathematica is that it helps me better understand the nature of my programming and problem solving. It’s a great tool to help make sense of problems, see your errors, verify… Read More

More good bad results

Some days, things don’t go well, but you end up with interesting looking things anyway.                      


Back in 1987 I wrote some code for generating ‘noisy objects’. I cleaned up that code over the years, enhanced some calculations, played with new Mathematica features. Now I’ve got stuff that looks like this. I’ll put a… Read More

Curvature Field Computations

Curvature field calculations for a random noisy shape. Colors represent magnitude of curvature. Iso-contours also shown in lovely pink.          

Hairy Glaven

Hairy elongated noisy stimulus.   The lines are surface normals, sampled across the object. They are generated using a continuous random method (sometimes called ‘noise’) and were used to test symmetry perception in 3D shape.      … Read More

Sculpted Golden Boy

A stimulus, # 13, otherwise known as ‘golden boy’ Colors indicate mapping of under- and over-sculpt from a shape production experiment where we had artists and non-artists reproduce shapes using only vision, touch, or some combination of both… Read More

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