These theories and concepts commonly involve psycholinguistics and sociolinguistics . French and Linguistics offers courses in non-English languages, linguistics, and psycholinguistics. Another use of treebanks in theoretical linguistics and psycholinguistics is interaction evidence. Linguistic prediction is an active area of research in psycholinguistics and cognitive neuroscience. Pinker's academic specializations are visual cognition and psycholinguistics. The tip of the tongue phenomenon has implications for research in psycholinguistics, memory, and metacognition. The lexical decision task (LDT) is a procedure used in many psychology and psycholinguistics experiments. Artificial languages have been used in research in developmental psycholinguistics. These findings have led to studies of code-mixing in psychology and psycholinguistics. The term is also used in psycholinguistics when describing language comprehension. Osgood was a social psychologist interested in psycholinguistics, and research. Many of the experiments conducted in psycholinguistics, especially earlier on, are behavioral in nature. Within the field of psycholinguistics, speech errors fall under the category of language production. Wason continued to explore and experiment in the field of psycholinguistics. Also in Smith, Frank, Psycholinguistics and Reading, Holt, 1972, pp.