In two experiments, subjects monitored sequences of spoken consonant-vowel-consonant words and nonwords for a specified initial phoneme. In Experiment I. the target-carrying monosyllables were embedded in sequences in which the monosyllables were all words or all nonwords. The possible contextual bias of Experiment I was minimized in Experiment II through a random mixing of target-earrying words and nonwords with foil words and nonwords. Target-carrying words were distinguished in both experiments from target-carrying nonwords only in the final consonant, e.g., fbitl vs. fbip/. In both experiments, subjects detected the specified consonant fbi significantly faster when it began a word than when it began a nonword. One interpretation of this result is that in speech perception lexical information is accessed before phonological information. This interpretation was questioned and preference was given to the view that the result reflected processes subsequent to perception: words become available to awareness faster than nonwords and therefore provide a basis for differential responding that much sooner.It is commonplace to conceptualize the process of pattern identification as a hierarchically organized sequence of operations that maps the structured energy at the receptors onto increasingly more abstract representations. In its most simplistic form, this conception characterizes the "conversation" between representations as unidirectional; that is, a more abstract representation is constructed with reference to a less abstract representation, but not vice versa. There are, however, a number of curious results that question the integrity of this characterization. By way of example, a briefly exposed and masked letter is recognized more accurately when part of a word than when part of a nonword (Wheeler, 1970; Reicher, Note 1). Other, related results suggest that this is a fairly general phenomenon. Thus, detection of an oriented line is significantly better when it is part of a briefly exposed, and masked, unitary picture of a well-formed threedimensional object than when it is a part of a picture portraying a less well-formed, and flat, arrangement of lines (Weisstein & Harris, 1974). As revealed in the work of Biederman and his colleagues