wwp@yahoogroups.com:
Re: Misconcept of the Physiology of Eye Movement
Erik Krause 2010-Dec-23 14:48:00
Am 22.12.2010 19:58, schrieb CTR:
> When the eyes scan a picture or a scene o rare reading a line of
> text, they are moving smoothly around. The movement of the eye can
> be described in three phases: acceleration - movement -
> deceleration.
>
> This is wrong..
[...]
> The phases of acceleration and deceleration are in the range of a
> few milliseconds.
:-)
Few milliseconds actually are a long time. And the speed differences
between short and long jumps show that there most likely is an
acceleration and deceleration phase lowering the average speed for short
jumps.
Although the eyes move at a high speed it takes some time longer to fix
a given point. At least this is what I percieve if I try to look
somewhere (that's just me, but I consider me pretty normal ;-)
But the point with decelerating panorama panning is somehow different,
since we follow a movement with our eyes which then stops immediately.
There is a reaction time needed to actually realize that the movement
stopped, not only mere eye motion.
And last but not least we're not used to view something stopping really
immediate in thin air, because it doesn't happen in real world. Usually
there is some advance warning in form of deceleration (or a concrete
wall :-)
So the inertia of the whole psycho-physical system is much higher than
the mere physiological one.
Once again in real life it's a bit more complicated than in pure science...
Merry christmas to all, and avoid the concret walls... ;-)
--
Erik Krause
http://www.erik-krause.de