Consider a correlational opponent processing or an associational reciprocal
inhibition/excitatory system as an explaination. All senses would have a main
gaussian standing wavelet filter pattern of neutrality. Any deviation from the
learned pattern can result in some interesting observations. In the case of
odor, deviation is normally experienced as a "bad" smell because the current
information is discrepant from the normal. Habituation to the new odor would
occur after a mild stroke or chemical scrambing of the reference codes and
slowly the person would learn a new "normal". If part of one of the
bi-intergration sensory tastet system is damaged or blocked the signal will be
interpreted as an increase in sweet, sour, bitter and a decrease in salty taste.
Consider the following model to understand the relationship:
Press two hands together equally in an up/down relationship with the right hand
on top under a table to simulate what happens in a correlational opponent
process. The right pushes down and the left pushes up. Now stop pushing with
the right hand and the left hand will push the right hand up but will reach
equilbrum again as the table is hit. The increase in height means sweeter,
sourer, bitter, and less salty taste. If the right hand increases its efforts
and pushes the left hand down to the floor a new equilbrum will be reached which
will be interepreted as less sweet, less sour, less bitter and more salty taste.
Real life examples: motion after effect - waterfall illusion, negative after
image, color opponent reaction - blue become yellow and red becomes green,
opponent process in drugs and addiction, pain picture at
http://cfa-www.harvard.edu/~peprbv/pain.html;
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