Bottom-up driven speechreading in a speechreading expert: the case of AA (JK023).
OBJECTIVE
This case study tested the threshold hypothesis (Rönnberg et al., 1998), which states that superior speechreading skill is possible only if high-order cognitive functions, such as capacious verbal working memory, enable efficient strategies.


METHODS
In a case study, a speechreading expert (AA) was tested on a number of speechreading and cognitive tasks and compared with control groups (z scores). Sentence-based speechreading tests, a word-decoding test, and a phoneme identification task were used to assess speechreading skill at different analytical levels. The cognitive test battery used included tasks of working memory (e.g., reading span), inference-making, phonological processing (e.g., rhyme-judgment), and central-executive functions (verbal fluency, Stroop task).


RESULTS
Contrary to previous cases of extreme speechreading skill, AA excels on both low-order (phoneme identification: z = +2.83) and high-order (sentence-based: z = +8.12 and word-decoding: z = +4.21) speechreading tasks. AA does not display superior verbal inference-making ability (sentence-completion task: z = -0.36). Neither does he possess a superior working memory (reading span: z = +0.80). However, AA outperforms the controls on two measures of executive retrieval functions, the semantic (z = +3.77) and phonological verbal fluency tasks (z = +3.55).


CONCLUSIONS
The performance profile is inconsistent with the threshold hypothesis. Extreme speechreading accuracy can be obtained in ways other than via well-developed high-order cognitive functions. It is suggested that AA's extreme speechreading skill, which capitalizes on low-order functions in combination with efficient central executive functions, is due to early onset of hearing impairment.
Andersson
Ulf
U
Department of Behavioural Sciences, Linköping University, Linköping, Sweden.
Lidestam
Björn
B
D000328:Adult; D001288:Attention; D004192:Discrimination, Psychological; D006801:Humans; D008085:Lipreading; D008297:Male; D008568:Memory; D008875:Middle Aged; D010700:Phonetics; D012660:Semantics; D013067:Speech Perception; D013997:Time Factors; D014705:Verbal Behavior