Tact Extension refers to the process by which stimulus and response classes are established, allowing generalization of tacts. This means that novel stimuli, which share certain characteristics with known stimuli, can evoke the same tact behavior without direct training, enabling the speaker to label new items based on previously learned concepts.
Example
A child learns to tact a “dog” when they see their pet at home. Later, when they see a wolf at the zoo, they call it a “dog.” This demonstrates a tact extension, as the child is generalizing the tact behavior to a novel stimulus (wolf) that shares similarities with the known stimulus (dog).