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- Newsgroups: rec.motorcycles
- Path: sparky!uunet!caen!destroyer!news.iastate.edu!tomes
- From: tomes@iastate.edu ()
- Subject: Re: HELMETS
- Message-ID: <BxzJwI.AB@news.iastate.edu>
- Sender: news@news.iastate.edu (USENET News System)
- Organization: Iowa State University, Ames, IA
- References: <1992Nov19.001059.7670@megatek.com> <1992Nov19.033924.25567@spdc.ti.com> <1992Nov19.200105.12133@megatek.com>
- Date: Thu, 19 Nov 1992 23:00:16 GMT
- Lines: 56
-
- In article <1992Nov19.200105.12133@megatek.com> randy@megatek.com writes:
- >In article <1992Nov19.033924.25567@spdc.ti.com> serafin@epcot.spdc.ti.com (Mike Serafin) writes:
-
- > Really. Are you really this stupid?
- >
- > OK, do this for me. Put your helmet on and without turning your *head*,
-
- (lots of almost right rationalizations why not to wear a helmet deleted)
-
- Then you should tell the Air Force that their pilots need their peripheral
- vision and must redesign their helmets.
-
- A relative of mine is a civilian researcher in charge of human factors
- research projects for the Air Force and I had the opportunity to talk at
- length with him about Situational Awareness (SA) and the means that humans
- use to gather data to produce good SA. The findings of repeated tests
- using a special helmet that senses eye position and therefore the point of
- focus, and playing with the field of view available to the pilots, led to
- some significant conclusions.
-
- Good SA depends more on the quantity of information gathered, which comes
- almost exclusively from the 5 degreee locus around the point of focus, with
- almost none of it coming from the region that is normally called 'peripheral
- vision'.
-
- Since it is very difficult to focus on a point very far from the center of
- the field of view (in front of the head: try to focus on something in the
- 'peripheral vision' region) this part of your vision is not as important as
- one simple concept: scan. Moving the focus of vision is the primary method
- for gathering information on the environment, and if you rely on peripheral
- vision to warn you of danger then you are not scanning your environment
- enough.
-
- You did not even mention one of the major benefits of helmets: protection from
- flying dust particles (yes, on my fully faired Wing it is a problem) or just
- the wind itself. On any bike, there is enough turbulence even in a relatively
- calm pocket to cause reduction of visual acuity when you do not wear goggles
- or a full face helmet.
-
- Almost all of the information gathered is in front of your face: you move
- your head to accomodate the need to gather data that is not in front of the
- bike. The usefulness of moving your eyes lies in the fact that you can move
- your eyes much faster than you can move your head. This is not to say that
- peripheral vision has no importance at all, just to say that there are better
- things to worry about. Like scanning, and looking far enough ahead to not
- have to worry about hazards occurring too fast to avoid.
-
- I assume that you are travelling at psuedo-legal speeds and not at DoD-nominal
- which appears to be somewhere between 100 and 150 mph. If you are foolish
- enough to ride at over 150 feet per second then no amount of peripheral
- vision will help you.
-
- CP Tomes
-
-
-
-