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Past tense processing and language breakdown: What does ‘normal’ look like?

Past tense processing and language breakdown: What does ‘normal’ look like?. Jennifer Aydelott Rob Leech Maciej Trzaskowski. Patient Study. Past Tense Debate: distinct mechanisms for regular and irregular verbs?

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Past tense processing and language breakdown: What does ‘normal’ look like?

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  1. Past tense processing and language breakdown:What does ‘normal’ look like? Jennifer Aydelott Rob Leech Maciej Trzaskowski

  2. Patient Study • Past Tense Debate: distinct mechanisms for regular and irregular verbs? • goal: reconcile findings from studies of morphological processing and lexical priming in aphasia • stimuli: spoken word pairs • tasks: explicit judgment, implicit priming • types of linguistic information: morphology, phonology, semantics • participants: LH damage + language impairment  pattern of brain activity in healthy adults?

  3. Proposed Design • 16-20 healthy adult volunteers • 3 explicit judgment tasks [yes/no button press] • morphology [past tense match?] • irregular: sank-sink / sinked-sink / threw-sink • regular: linked-link / lank-link / showed-link • phonology [same?] • pseudo-irregular: pink-pink / pank-pink / twun-pink • pseudo-regular: mink-mink / minked-mink / bunned-mink • semantics [meaning related?] • relationship: nest-bird / sky-bird / vase-bird • + baseline • noise discrimination [same?] • noise pairs: white-white / pink-pink / white-pink / pink-white

  4. Proposed Design • whole brain fMRI • semi-sparse sampling (TR=5s, TE=50ms, 3x3x4mm resolution) • mixed blocked & event-related design • 162 trials per task (minimum 27 trials per condition) • task blocks interspersed with baseline • trial order pseudorandomized • task order counterbalanced • full factorial analysis (GLM) block 1 54 trials 4.5 mins block 2 54 trials 4.5 mins block 3 54 trials 4.5 mins task 1 task 2 task 3 baseline 2 mins baseline 2 mins

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