摘要：We present a brief case series of jargonaphasic patients and use the level of target/error overlap totest models of the speech production process. We ask three questions: 1) Are lexical failure anddisruption of phonological encoding separate impairments, responsible for abstruse and targetrelated neologisms, respectively, or is there a single impairment to phonological encoding, (e.g.Buckingham, 1981, vs. Miller & Ellis, 1987)? 2) Do lexical and non-lexical routes for reading andrepetition sum information (Hillis & Caramazza, 1991)? 3) Are correct responses predictable fromthe overlap between errors and their targets, i.e. are they just responses where phonemes haveescaped the disruption that produces errors?Information Criterion (see Burnham & Anderson, 2002), gave clear answers. There was no evidencethat abstruse neologisms resulted from lexical failures. Errors with low levels of overlap were notmore common than expected based on the segmental probability of error (see relatively low levelsof 0 overlap for patient VS, Figure 1). Lexical and non-lexical sources were summed during readingand repetition (see high overlap in JH’s word repetition, supported by non-word repetition, but lowoverlap in naming and reading, indexing the lexical contribution, Figure 1). Finally, the number ofcorrect responses was not a predictable function of the probability of error. Correct responses werenot simply words where all phonemes escaped error (see, for example, large number of correctresponses in JW and VS, despite a segmental probability of error estimated at around 30 percent,Figure 1). These patients did not support a two-source model of jargonaphasia (see Schwartz et al,2004; although two sources is not ruled out for other patients), they did support combininginformation from lexical and non-lexical routes and they point to a special factor that preserves theintegrity of correct responses. This may be a lexical boost, interactivity between lexical andsegmental levels, or a chaining mechanism that involves lexical information (Dell, 1986; Rapp &Goldrick, 2000).
