| A | B |
| consciousness | A state of awareness. |
| directed consciousness | Focused and orderly awareness. |
| flowing consciousness | Drifting, unfocused awareness. |
| daydreams | Relatively focused thinking about fantasies. |
| divided consciousness | The splitting off of two conscious activities that occur simultaneously. |
| unconscious mind | Mental processes that occur without conscious awareness. |
| hypnagogic state | A relaxed state of dreamlike awareness between wakefulness and sleep. |
| myoclonia | An abrupt movement that sometimes occurs during the hypnagogic state in which the sleeper often experiences a sense of falling. |
| REM sleep | Rapid-eye-movement sleep, characterized by movement of the eyes under the lids; often accompanies dreams. |
| day residue | Content in dreams that is similar to events in the person’s waking life. |
| stimulus incorporation | Stimuli that occur during sleep that are incorporated into dreams either directly or in altered form. |
| manifest content | According to Freud, the obvious, but superficial, meaning of dreams. |
| latent content | According to Freud, the true meaning of dreams that is found in the symbols in their manifest content. |
| night terror | A dream that occurs during REM sleep whose content is exceptionally frightening, sad, angry, or in some way uncomfortable. |
| sleepwalking | Waking and carrying on complicated activities during the deepest part of non-REM sleep. |
| meditation | Several methods of focusing concentration away from thoughts and feelings and generating a sense of relaxation. |
| transcendental state | An altered state of consciousness, sometimes achieved during meditation, that is said to transcend normal human experience. |
| hypnosis | An altered state of consciousness in which the individual is highly relaxed and susceptible to suggestions. |
| depersonalization | The perceptual experience of one’s body or surroundings becoming distorted or unreal in some way. |
| psychotropic drugs | The class of drugs that alters conscious experience. |
| stimulants | Drugs that increase the activity of the central nervous system, providing a sense of energy and well-being. |
| depressants | Drugs that reduce the activity of the central nervous system, leading to a sense of relaxation, drowsiness, and lowered inhibitions. |
| opiates | Narcotic drugs derived from the opium poppy. |
| inhalants | Toxic substances that produce a sense of intoxication when inhaled. |
| hallucinogens | Drugs that alter perceptual experiences. |