Going for 2 and 3
>2. Are there folks who are color-blind as a result of having no cones at
>all? This seems unlikely to me (isn't the fovea all cones?), but I wasn't
>sure.
Color blindness (no color vision at all) can results from either missing
all cones or missing 2 of the 3 types. If an individual is missing all
cones, it does lead to visual problems other than color blindness - they
tend to have problems with bright light (since rods work better in dim
light). Complete color blindness can also occur with damage to V4 in the brain.
>3. What would cause poor depth perception? Is there a particular brain
>region or visual pathway that, if damaged, results in the inability to
>perceive depth?
Poor depth perception - such as problems with binocular disparity? Ah, that
I know (through experience!). The visual system needs appropriate
environmental stimuli as it is developing, otherwise, no binocular
disparity. If someone has a lazy eye or one eye is a lot stronger than
other, this may only partially develop or not develop at all! An individual
with one eye would not have binocular disparity. However, you learn
monocular cues that can be used for depth perception.
>Thanks in advance,
>Larry
>
>************************************************************
>Larry Z. Daily
>Assistant Professor of Psychology
>Department of Psychology
>White Hall, Room 213
>Shepherd College
>Shepherdstown, West Virginia 25443
>
>phone: (304) 876-5297
>email: [EMAIL PROTECTED]
>WWW: http://webpages.shepherd.edu/LDAILY/index.html
Deb
Dr. Deborah S. Briihl
Dept. of Psychology and Counseling
Valdosta State University
Valdosta, GA 31698
(229) 333-5994
[EMAIL PROTECTED]
http://chiron.valdosta.edu/dbriihl/
Well I know these voices must be my soul...
Rhyme and Reason - DMB
