An eyetracking experiment was conducted to explore a self-paced reading effect reported by Mitchell (1987), Mitchell found that a noun phrase (NP) was read slowly when it immediately followed an intransitive verb, as long as the verb and NP appeared in the same presentation region, This effect has been used to support the claim that verb subcategorization information is not used initially in sentence parsing. However, the effect did not appear in the eyetracking experiment reported in the present paper, supporting criticisms that Mitchell's segmentation procedure distorted the parsing process.Understanding a sentence involves, among many other factors, determining the syntactic relations among the words and phrases ofa sentence. For instance, in After the dog scratched the veterinarian ... , a reader or listener must decide whether the noun phrase (NP) the veterinarian following the verb scratch is the direct object of that verb or whether it is the subject of a new clause. In this process of"parsing" a sentence, readers and listeners must obey the grammatical principles of their language, and they must also honor the lexical requirements ofthe words in the sentence. They must, for example, eliminate an analysis that treats an NP following a purely intransitive verb such as struggle as its direct object.The present paper reexamines some often-cited evidence (Mitchell, 1987) about how lexical information, such as verb transitivity, is used in parsing. This evidence has been taken as a strong argument that sentence structure is created on the basis of general principles and not simply retrieved from memory as configurations prestored with lexical items. To our disappointment, we conclude that the evidence cannot be taken at face value and that other arguments must be developed to decide whether parsing is a matter of structure building or structure retrieval.There is substantial agreement that such lexical subcategorization information (information about the possi- ble phrasal complements of a verb or other word) is used quickly, within a period of 0.4-2 sec of word processing (see Boland & Tanenhaus, 1991;Ferreira & Henderson, 1991;Frazier, 1989;Mitchell, 1989Mitchell, , 1994Tanenhaus, Carlson, & Trueswell, 1989; and Trueswell, Tanenhaus, & Kello, 1993, for reviews). However, there is considerable disagreement about the precise mechanism by which subcategorization information is used. At one extreme are models that maintain that only major category information, such as noun or verb, and phrase structure rules are used in assembling the initial structure, Such models have been entertained by Frazier (1987aFrazier ( , 1989 and by Mitchell (1987Mitchell ( , 1989. These models claim that detailed lexical information plays its role only after an initial structure is built, filtering out analyses that violate lexical constraints.At the other extreme are "lexical guidance" theories, which hold that specific lexical information is the only source of syntactic structure, Ford, Bresnan, and Kaplan (1982) suggest that the l...