Chewing
gum is considered the world’s most common habit and over 374 trillion
sticks of it are made every year. Many people use chewing gum not only
for its flavor, but also to help them relax, concentrate, relieve
nervous tensions, enhance memory
and mental performance, lose weight and even to speed up recovery after
gastrointestinal surgeries. Researchers at the Centre for Occupational
and Health Psychology, Cardiff University, UK have taken a particular
interest in the cognitive effects of chewing gum and in 2009 they
published a study stating that gum increases alertness, accuracy and
overall intellectual performance but has no effect on memory. However,
according to a follow-up study conducted at the same University, and
published in the Quarterly Journal of Experimental Psychology (2012),
chewing gum may actually impair short-term memory and compromise
performance on memory related tasks.
The Effect of Chewing Gum on Memory
In order to assess the precise effects of chewing gum on memory, the
researchers asked 40 students to chew gum vigorously and to
simultaneously memorize a sequence of randomly combined words and
letters in the order that they were heard or seen. A second group of
students were asked to memorize the same word and letter sequences, but
they were instructed to chew gum naturally. A third test was also
performed, where the students were asked to identify the missing items
in a sequence, while chewing gum. The study found that all three
situations resulted in reduced performance
on short-term memory related tasks. More specifically, the students
experienced forgetfulness and consequently, a greater difficulty in
recalling the correct order of the word sequences.
Why Gum is Making You Forgetful
According to Gizmodo, Australia, researchers “suggest that the
periodic action that is chewing gets in the way of repetitious cognitive
tasks. If you try and memorize a phone number while tapping your
finger, you’ll find it much harder than if you’re not tapping — and they
suggest the exact same thing is true of chewing. In fact, they (the
researchers at Cardiff University) even performed an experiment along
those lines, and found that both tapping and chewing gum had similar
(compromising) results on short-term memory.”
The results of the most recent Cardiff study, directly contrast three
past studies. The first opposing study found that chewing gum results
in better spatial recognition memory, as well as improved short-term
number recognition and word recognition tasks (Wilkinson et al, 2002).
The other two opposing studies (Baker et al., 2004, and Johnson &
Miles) found that chewing gum enhances recall performance of a
relatively long list of words. Some researchers hypothesize that gum
enhances memory because the actual process of chewing gum increases
blood flow to the brain. This hypothesis however, does not explain the
results of the most recent Cardiff study which found that gum actually
increases forgetfulness and compromises memory.
One explanation for the discrepancy in study results may be the
flavor of the gum, or lack thereof, used in the studies. According to
the Cardiff study authors “The discrepancy between the current study and
previous research on the effects of chewing on short term memory could
be associated with the absence of flavor in the gum used in the present
study. Flavor has previously been suggested as one factor underpinning
the beneficial effects of gum.” It looks like the verdict is still out
when it comes to the effects of chewing gum on short-term memory, but if
you do choose to chew during an important test, you may want to choose a
long-lasting, flavorful variety!
that's great chewing gum is one of the best source to boost our brain power, thanks to share with us the Benefits related to chewing the gum
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