Beauchamp:100Hue: Difference between revisions
No edit summary |
|||
| (8 intermediate revisions by the same user not shown) | |||
| Line 3: | Line 3: | ||
<div style="padding: 8px; color: #000000; background-color: #ffffff; width: 730px; border: 2px solid #666666;"> | <div style="padding: 8px; color: #000000; background-color: #ffffff; width: 730px; border: 2px solid #666666;"> | ||
==Notes on the 100 Hue Stimuli== | ==Notes on the Farnsworth-Munsell 100-Hue Stimuli== | ||
The Farnsworth-Munsell 100 Hue test is a behavioral test of color vision. | The Farnsworth-Munsell 100 Hue test is a behavioral test of color vision. | ||
| Line 15: | Line 15: | ||
Therefore, the fMRI adaptation was further adapted to eliminate the brightness matching step as described in | 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. [[Media: | # 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. [[Media:SimmonsetalNeuropsychologia2007.pdf|Click here to download the PDF]] | ||
These stimuli consist of JPGs of colored and black and white stimuli. To localize color-selective areas, present blocks of colored stimuli and black-and-white stimuli, one stimulus every two to three seconds. Twenty second blocks of stimulation | 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 | Click here to download a .zip file of the stimulus archive | ||
[[ | [[Media:Beauchamp100HueStimuli.zip|Beauchamp100HueStimuli|]] | ||
Latest revision as of 15:25, 12 September 2011
|
Beauchamp Lab
|
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 Beauchamp100HueStimuli|
