The Effects of Caffeine on the Brain
Caffeine is a stimulant drug often used to improve mental processing. There are many effects of caffeine on the brain, as well as psychological effects of caffeine. It is believed to work by blocking the neurotransmitter adenosine's receptors, increasing excitability in the brain. Caffeine also influences other neurotransmitters, including norepinephrine, dopamine, and acetylcholine. These have effects on mood and mental processing.
Effects of Caffeine on Mood
Caffeine increases alertness, and many people find that caffeine
improves their mood by improving their sense of being switched on, and
having a sense of task accomplishment.
However, like other stimulants, it also increases anxiety.
The effects of caffeine on mood are related to how the person expects
the caffeine to make them feel, and to the context of the caffeine
consumption, also known as set and setting.
So caffeine can provide a lift to your mood, but this is most
noticeable when your energy is already low. For many people, this is
when you haven't had caffeine for a while, so some experts believe that
the positive effects are actually simply a warding off of caffeine
withdrawal.
This is only partially true—research shows that the positive effects
of caffeine on mood occur in people who are not withdrawing as well as
those who are. But for those who experience an increase in anxiety, the
effects of caffeine on mood are unpleasant.
Effects of Caffeine on Mental Performance
Caffeine has been shown to improve performance on a range of
different tasks, including vigilance, response times, information
processing, and some—but not all—proofreading tasks.
But don't assume that it is worthwhile using caffeine as a shortcut to improving your performance. When comparisons are made between people whose daily intake of caffeine is low (up to 100 mg caffeine per day) and those who regularly consume a lot of caffeine (more than 300mg caffeine per day), we find that the improvements are quite small, and don't get better with more caffeine.
While people who use a lot of caffeine every day do show improved performance with more caffeine, it may be that they are simply counteracting the effects of caffeine addiction—so by taking more caffeine, they are getting closer to what their performance would be if they weren't addicted to caffeine in the first place.Not sure whether your caffeine intake is high or low? Read about the amount of caffeine in foods and drinks.
But don't assume that it is worthwhile using caffeine as a shortcut to improving your performance. When comparisons are made between people whose daily intake of caffeine is low (up to 100 mg caffeine per day) and those who regularly consume a lot of caffeine (more than 300mg caffeine per day), we find that the improvements are quite small, and don't get better with more caffeine.
While people who use a lot of caffeine every day do show improved performance with more caffeine, it may be that they are simply counteracting the effects of caffeine addiction—so by taking more caffeine, they are getting closer to what their performance would be if they weren't addicted to caffeine in the first place.Not sure whether your caffeine intake is high or low? Read about the amount of caffeine in foods and drinks.
And while there have been several studies showing that caffeine
improves vigilance and reaction times, others exploring the subtleties
of how this works have found that at least some of the time, this is an
expectancy effect.
Expectancy effects are a significant aspect of the effects that drugs
have on people's perceptions and behaviors. People's expectancies of
how caffeine will affect their performance—in particular, if they think
it will impair their performance—seems to underlie some of the
improvements in performance. In other words, if people think consuming
caffeine will make their performance worse, they try harder and
compensate for the expected effects of caffeine.
Is Caffeine a Good Way of Improving Mental Performance?
Overall, it probably isn't worth trying to enhance your performance
by using more caffeine. The short-term benefit you may get from caffeine
will be offset by increased anxiety while you are under the influence
of caffeine, and when the effects wear off, withdrawal symptoms may
worsen the very mental processes you are hoping to improve.A better strategy for low users of caffeine, who drink the equivalent of
one or two cups of coffee a day, would be choosing when to consume
them, and timing your caffeine intake so that you are getting the
stimulant effects, and not the withdrawal effects, before a task that
requires your full attention. And remember, your performance could also
be negatively impacted by caffeine.If you use a lot of caffeine—drinking the equivalent of more than three
cups of tea or coffee per day—it may be negatively affecting your
health, so lowering your intake is worth considering.
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