Hi Hoover, could you please post this? Thanks,
John Kelly
For sometime, I have been writing software to make basic visual stimuli for
electrophysiology such as drifting sinewave gratings, gaussian blobs,
flicker, checkerboards, dynamic random dot, etc. It also does psychophysical
Method of Adjustment or 2-alternative forced choice for contrast threshold
(uses the mouse). If you would like to try out the program for your own use,
you can download it from:
http://faculty.washington.edu/jokelly/
There are some nice benefits to the program, including no programming is
needed and new configurations can be easily stored and edited. It provides a
TTL trigger via the Parallel Printer Port for external equipment. Spatial
resolution is up to 1280 x 1024 pixels and you can import PCX files (Ver.
3.0) and modulate the image at the frame rate of the monitor. You can
automatically calibrate your monitor if you have a photometer with a voltage
output and a National Instruments LAB PC+ A/D board, and others advantages
too.
The bad news is that, with optimal standard PC video hardware in 256 color
mode you will be limited to 8-bits intensity resolution for each RGB output.
Most PC video boards only give you only 6-bits intensity resolution!
I will be happy to hear your comments. Thanks
John Kelly, Ph.D.
Dept. of Ophthalmology, CH-61
Children's Hospital & Medical Center
4800 Sand Point Way N.E.
Seattle, WA 98105 USA
Office) 206-527-3899
Fax) 206-528-2722
Email) JKELLY@CHMC.ORG