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Illusion - Is Seeing Really Believing?
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Illusion - Is Seeing Really Believing (1998)(Marshall Media)[Mac-PC].iso
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hub_fie.cxt
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00084_Field_frep63.txt
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1996-12-30
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990b
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35 lines
Most amazing was the contrast
between the machine-gun
discharge when the orientation
of the stimulus was just right
and the utter lack of a response
if we changed the orientation
or simply shined a bright
flashlight into the cat's eyes.
Responses of one of the first
orientation-specific cells
Torsten Wiesel and I recorded,
from a cat striate cortex in
1958. This cell not only
responds exclusively to a
moving slit in an eleven o'clock
orientation but also responds to
movement right and up, but
hardly at all to movement left
and down.
The discovery was just the
beginning, and for some time
we were very confused because,
as luck would have it, the cell
was of a type that we came later
to call complex, and it lay two
stages beyond the initial,
center-surround cortical stage.
Although complex cells are the
commonest type in the striate
cortex, they are hard to
comprehend if you haven't seen
the intervening type.