Page 1: Introduction to States of Consciousness

Overview of Sleep

• Considered a time of tranquility but involves significant brain activity.

• Measures of brain activity show varying electrical discharges (amplitude and frequency).

• Physical activity includes eye movements.

• The thalamus controls sensory-motor information flow during sleep.

Sleep Stages

Transition to Sleep

• Begins from a relaxed waking state to:

  • Stage 1 Sleep: Rapid, low amplitude brain waves, a brief transition stage lasting a few minutes. Images may appear, but not true dreaming.