home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Illusion - Is Seeing Really Believing?
/
Illusion - Is Seeing Really Believing (1998)(Marshall Media)[Mac-PC].iso
/
mac
/
ILLUSION
/
SROCK_TX.CXT
/
00372_Text_rem16t.txt
< prev
next >
Wrap
Text File
|
1996-12-31
|
1KB
|
41 lines
Deborah Smith and I
performed some experiments
with tropical fish to test this
hypothesis. We placed a fish in
a cylindrical glass tank that
was surrounded by a drum lined
with vertical stripes. The top
was covered except for a small
hole in the center through
which the fish could be viewed.
In one experiment, we rotated
the tank about its center, thus
generating a current because of
friction, while keeping the
surrounding drum stationary.
This essentially simulates the
situation of the fish in the
river carried downstream by a
current. We reasoned that the
fish does not directly react to
the water current but
ordinarily responds to it only
by its visual consequencesΓÇöΓÇô
that is, being carried away from
visible objects in its field. To
prove this, we first wrapped the
tank with white paper so that
the fish could not see through
the tank. Under these
conditions, the fish made no
effort to swim against the
current going around the tank.
When we removed the paper so
that the fish could see the
stationary stripes,
however, all fish swam
vigorously against the current,
thus remaining in place
opposite any given set of
stripes.