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Notes on the Farnsworth-Munsell 100-Hue Stimuli
The Farnsworth-Munsell 100 Hue test is a behavioral test of color vision.
It was adapted for use in the fMRI scanner as described in
- Beauchamp, M.S., Haxby, J.V., Jennings, J.E., and DeYoe, E.A.: An fMRI version of the Farnsworth-Munsell 100-Hue test reveals multiple color-selective areas in human ventral occipitotemporal cortex. Cereb Cortex 9: 257-263, 1999. Click here to download the PDF. Click here for the related journal cover image
- Beauchamp, M.S., Haxby, J.V., Rosen, A.C., and DeYoe, E.A.: A functional MRI case study of acquired cerebral dyschromatopsia. Neuropsychologia 38:1170-1179, 2000. Click here to download the PDF
In these publications, stimuli was presented using a Cambridge Research Systems graphics board. Each color was calibrated to be the same brightness as every color using flicker photometry. This is important because the F-M 100 Hue test requires subjects to place the colors in order by hue. If the colors differ in brightness, subjects could "cheat" and use brightness as a cue.
However, equating brightnesses is time-consuming.
Therefore, the fMRI adaptation was further adapted to eliminate the brightness matching step as described in
- Simmons, W. K., Ramjee, V., Beauchamp, M. S., McRae, K., Martin, A., and Barsalou, L. W.: A common neural substrate for perceiving and knowing about color. Neuropsychologia 45:2802-2810, 2007. Click here to download the PDF
These stimuli consist of JPGs of colored and black and white stimuli. To localize color-selective areas, present separate blocks of colored stimuli and black-and-white stimuli, one stimulus every two to three seconds; a brief interstimulus interval (500 ms was used in Cerebral Cortex article above) is also a good idea. Twenty second blocks of stimulation interspersed with 10 seconds of fixation could work reasonably well.
Click here to download a .zip file of the stimulus archive