4 Nov
2003
4 Nov
'03
5:45 a.m.
"John Rollins" <kd7bcy(a)teleport.com> wrote:
Actually there was a story on the news a few weeks ago
saying that
only "slow" cats like TV. They process information faster so a normal
cat doesn't see anything on the TV but a bunch of streaky lines - the
refresh rate is too slow for them.
[...]
They just watch the scan lines going back and forth.
Should be easy to test this hypothesis by using an LCD TV or monitor.
The LCD material has a long enough persistence that it maintains a
continuous image, as you can tell if you photograph one at a high shutter
speed.
If the hypothesis is true, and cats have short retinal persistence,
on a CRT TV, cats wouldn't see the scanning per se. They'd see a rolling
band, due to the phosphor persistence which is typically between 1/5 and
1/3 of the field rate.