An ERP study by Mehravari et al. (2017) found deaf and hearing readers had similar N400 effects to semantic violations, but only hearing readers showed a P600 effect to verb agreement violations. To assess whether lac...
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This investigation examined processing load during aspects of sentence comprehension in non-brain-damaged subjects. Our goals were to begin the process of quantifying the loads associated with on-line and off-line asp...
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This investigation examined processing load during aspects of sentence comprehension in non-brain-damaged subjects. Our goals were to begin the process of quantifying the loads associated with on-line and off-line aspects of sentence processing and to evaluate the utility of visuomotor tracking as an index of the resource demand associated with elements of sentence comprehension. Subjects were required to track an unpredictable visual target with their forefinger while listening to sentences and answering Yes-No comprehension questions. In general, tracking performance declined during the off-line task of responding to questions compared to the on-line task of listening to sentences and questions. Performance was also poorer during the beginning and end of the sentence compared to the middle of the sentence. Results are discussed in relation to resource theories of normal and aphasic sentence comprehension.
The processing of words and Pictures representing actions and objects was tested in 21 aphasic patients and 20 healthy controls across three word production tasks: picture-naming (PN), single word reading (WR) and wor...
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The processing of words and Pictures representing actions and objects was tested in 21 aphasic patients and 20 healthy controls across three word production tasks: picture-naming (PN), single word reading (WR) and word repetition (WRP). Analysis 1 targeted task and lexical category (noun-verb), revealing worse performance on PN and verb items for both patients and control participants. For Analysis 2 we used data collected in a concurrent gesture norming Study to re-categorize the noun-verb items along hand imagery parameters (i.e., objects that can/cannot be manipulated and actions which do/do not involve fine hand movements). Here, patients displayed relative difficulty with the 'manipulable' items, while controls displayed the opposite pattern. Therefore, whereas the noun-verb distinction resulted simply in lower verb accuracy across groups, the 'manipulability' distinction revealed a 'double-dissociation' between patients and control participants. These results carry implications for theories of embodiment, lexico-semantic dissociations, and the organization of meaning in the brain. (C) 2006 Elsevier Inc. All rights reserved.
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