Research work on mental disability in Kansas, United States involves experiments on operant conditioning. James R Lent, Research Assistant, talks about using media personnel to arrange teaching material. A monkey in a cage. A severely mentally disabled person undergoes a discrimination test. A man shows a boy a card with a picture of an eye on it. Four mentally disabled children sit at a table in front of a researcher. Cards of different colors on the table. A researcher works with a child. A boy in front of a researcher. A researcher works with Debra, a mentally disabled girl. Cards with dots printed on them on the table. Several yellow and a black token on the table. Debra collects the tokens. The researcher notes on paper. Toys and games arranged on racks. A boy takes a toy. A girl and a researcher work together. The researcher provides tokens for the correct responses of the girl. Three yellow tokens on a bed. A mentally disabled child makes his bed. A woman peeps from behind a wall.
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