Three experiments compared recognition memory for word versus nonword responses when they had been either read or generated using a rhyme rule and either a word or nonword stimulus. That is, either the word shop or the nonword thop was generated from either the word chop or the nonwordphop. In Experiment 1, the lexicality ofthe stimulus and response terms was manipulated orthogonally between subjects; in Experiments 2 and 3, it was manipulated orthogonally within subjects. In Experiment 3, subjects also made a lexical (word-nonword) decision about each response term after it had been read or generated. In all three experiments, memory performance was better for generated than read responses. This generation effect occurred only ifthe response term was a word, regardless ofwhether the stimulus term was a word or a nonword. These results are discussed in terms ofthe roles that lexical memory and response unitization play in the generation effect.People are better able to recall or recognize words if they have previously produced or generated them than if they have merely read them. This so-called generation effect was first studied extensively by Slameckaand Graf (1978). In their generatecondition, subjects used a specified rule (e.g., antonym) and a stimulus item followed by a single letter (e.g., HOT-C __J to generate and say aloud the target responseitem (COLD);in their read condition, subjects also said aloudthe response item (COLD), but both the stimulus and response items were presented intact (i.e., HOT-COLD). Subsequent tests showedbetter memoryfor the response itemsfrom the generatepairs than from the read pairs. This generation effect occurs for a wide range of materials and study and testing con-