I think it
is interesting to conduct experiments to determine the channel limit of each
human sense; that is, the maximum amount of information that can be conveyed by
each sense. It is commonly said that 80% of the information we process comes
from vision, which makes sense. For example, reading text is much more
efficient than hearing text, which is more efficient than reading Braille. However, the statistic itself is quite useless
without knowing the information capacity of sight.
Actually,
in hindsight, I am beginning to doubt the 80% figure, as the visual channel is
clearly much more capable than the other senses, not only in sheer capacity,
but also in responsiveness. In contrast, taste and smell have poor
responsiveness and poor differentiation ability. I am, however, very much
interested in knowing the dynamic range of smell (the maximum and minimum concentrations
detectable for a given substance).
Why is this
important? Most likely it is not. However, it is possible to develop special
assistive devices to replace damaged senses by transmitting through the other
still functional senses. The fundamental transmission limits of the senses
should provide a useful guide as to the full potential of the assistive device.
Knowing the
transmission capacity of each sense should also allow us to design better machine-human
interfaces. I posit that an interface providing visual, aural, and tactile
feedback would be better than one that provides the same capacity using only
the visual channel. In particular, the additional sensory channels may be used
to provide interrupts or higher priority signaling, as they may not use the
same attentional channels as vision does.
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