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When two tasks demand competing attention, there is generally a switching that occurs between the neural processes involved, rather than concurrent processing as may be expected with true multitasking.
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Brain plasticity (from the Greek word ‘plastos’ meaning molded) refers to the extraordinary ability of the brain to modify its own structure and function following changes within the body or in the external environment.
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Humans have used opiate drugs, such as morphine, for thousands of years, but these are often highly addictive and dangerous to one's health.
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The brain uses some unconventional means to communicate.
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Once the neural induction has occurred, the next step for new neurons is a journey to the proper position in the brain. This process is called migration, and it begins three to four weeks after a human baby is conceived.
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Hormones are important messages both within the brain and between the brain and the body.
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Insulation covering wires preserves the strength of the electrical signals that travel through them. The myelin sheath covering axons serves a similar purpose.
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Molecules that are important in brain development may help treat or prevent brain injuries and disorders.
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Although legal, alcohol is addictive. Together, alcohol abuse and alcohol addiction — sometimes referred to as alcoholism or alcohol dependence — are among the nation's major health problems.
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Despite definitive proof that smoking can be fatal, nicotine still is one of the most widely abused substances. In fact, tobacco kills more than 440,000 U.S. citizens each year — more than alcohol, cocaine, heroin, homicide, suicide, car accidents, and HIV combined.
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Ecstasy, herbal ecstasy, rohypnol ("roofies"), GHB (gamma hydroxy-butyrate), and ketamine are among the drugs used by some teens and young adults as part of raves and trances. Recent research, however, is uncovering the serious damage that can occur in several parts of the brain from use of some of these drugs.
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Marijuana distorts perception and alters the sense of time, space, and self. Researchers have made some progress in uncovering the reasons for these responses.
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