Drug-Induced
Changes in Consciousness
Meditation is one way to change
the quality of conscious experience; medication is another. Many psychoactive
drugs change aspects of one’s experience—so that antidepressants can decrease
someone’s sense of apathy or sadness; analgesics can decrease how much pain
someone is feeling. Other drugs have broader effects and seem to change the
very nature of our experience. This is certainly true for many of the illegal
drugs taken for recreational purposes; indeed, the change in consciousness is
often the reason why people use (and abuse)
these drugs. We discussed some of the biological mechanisms underlying the
drugs’ effects and noted that these mechanisms all influence information flow
at the synapse. Let’s now turn to the psychological effects of these drugs by
looking first at depressants (drugs
intended to decrease neural activity) and then at the stimulants (drugs that promote neural activity). After that, we’ll
discuss marijuana as well as the broader set of hallucinogens. And finally,
we’ll consider the thorny problem of defining “drug dependence” and addiction.
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