Glossary L

Lesion method refers to the method of investigating the functions performed by different areas of the brain by correlating impaired function with the location of damage to the brain.

- Leta Stetter Hollingworth (1886-1939) : Leta Stetter Hollingworth rejected the belief, popular at the time, that women achieve less than males do because they are intellectually inferior to males; instead her explanation emphasized differences in social opportunity. Her career focused on improving the education of both subnormal and gifted students.

Lethal dose is defined as a dose of a drug at which a given percentage of individuals die within a specified time

Letter level is defined as the level of written perception in which a visual stimulus is represented as a letter of the alphabet.

Letter of recommendation refers to a letter expressing an opinion regarding an applicant’s ability, previous performance, work habits, character, or potential for success.

Letter-sound correspondences is the principle that each letter represents a unit of sound (a phoneme).

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Leucocytes refers to white blood cells that find and destroy antigens

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Leukemia is a cancer originating in blood or blood-producing cells. Leukemias are cancers that are found in the blood and bone marrow.