Glossary L

Light sleep refers to Stage 1 sleep, marked by small irregular brainwaves and some alpha waves.

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Light therapy is the treatment for Seasonal affective disorder that involves exposure to bright lights during the winter months

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Light-from-above heuristic is the assumption that light often comes from above, which influences our perception of form in some situations.

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Light/Deep sleep refers to a stage of sleep which is described below:

Your brain waves move fast when you are awake. This is known as "beta" waves. When you lie down, close your e

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In the context of psychology, the term "lighter" refers to a psychological state or Condition characterized by a feeling of reduced emotional weight, a sense of relief, or an improved mood. This state is often associated with the alleviation of emotional burdens, stress, or negative emotions. People may experience a lighter emotional state after successfully addressing and resolving issues that were causing distress or after experiencing positive events that improve their overall well-being.

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Lightheadedness is defined as a feeling you are "going to faint." Lightheadedness is medically distinct from dizziness, unsteadiness, and vertigo. Please see Dizziness, Unsteadiness, and Vertigo.

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Lightness is perception of reflectance. Often objects with high reflectance are perceived as white and objects with low reflectance are perceived as gray or black.

Lightness constancy refers to the constancy of person's perception of an object’s lightness under different intensities of illumination.