The ELP (English Lexicon Project) is a large, publicly available psycholinguistic database that provides behavioral norms for word recognition. It includes data collected from lexical-decision and word-naming tasks performed by native English speakers. The database contains response latencies, accuracy rates, and other relevant linguistic information for a large set of words.

The database includes measures

• Lexical-Decision Latencies: Measures the time it takes for participants to decide whether a given string of letters is a real English word. This is the so-called lexical decision task and often appears in the literature as LDT.

• Word-Naming Latencies: In the speeded naming task, subjects are presented with a visual word (or sometimes a nonword) and are asked to name the word aloud as quickly and as accurately as possible.

• Response Accuracy: Tracks how often participants correctly identify words in lexical-decision and word-naming tasks.

• Coverage: Contains data for approximately 40,481 real words and an equal number of nonwords used in lexical-decision tasks.

• Data Source: Collected from 816 native English-speaking subjects across different institutions.

The ELP is commonly used in psycholinguistics, cognitive science, and natural language processing to study word recognition, reading comprehension, and lexical access. It serves as a valuable resource for research on word frequency effects, lexical processing, and language development.