Lexical segmentation and word recognition in fluent aphasia
The current thesis reports a psycholinguistic study of lexical segmentation and word recognition in fluent aphasia. When listening to normal running speech we must identify individual words from a continuous stream before we can extract a linguistic message from it. Normal listeners are able to resolve the segmentation problem without any noticeable difficulty. In this thesis I consider how fluent aphasic listeners perform the process of lexical segmentation and whether any of their impaired comprehension of spoken language has its provenance in the failure to segment speech normally. The investigation was composed of a series of 5 experiments which examined the processing of both explicit acoustic and prosodic cues to word juncture and features which affect listeners' segmentation of the speech stream implicitly, through inter-lexical competition of potential word matches. The data collected show that lexical segmentation of continuous speech is compromised in fluent aphasia. Word hypotheses do not always accrue appropriate activational information from all the available sources within the time frame in which segmentation problem is normally resolved. The fluent aphasic performance, although quantitatively
Kelly, Mary Louise
Lexical segmentation and word recognition in fluent aphasia. The current thesis reports a psycholinguistic study of lexical segmentation and word recognition in fluent aphasia. When listening to normal running speech we must identify individual words from a continuous stream before we can extract a linguistic message from it. Normal listeners are able to resolve the segmentation problem without any noticeable difficulty. In this thesis I consider how fluent aphasic listeners perform the process of lexical segmentation and whether any of their impaired comprehension of spoken language has its provenance in the failure to segment speech normally. The investigation was composed of a series of 5 experiments which examined the processing of both explicit acoustic and prosodic cues to word juncture and features which affect listeners' segmentation of the speech stream implicitly, through inter-lexical competition of potential word matches. The data collected show that lexical segmentation of continuous speech is compromised in fluent aphasia. Word hypotheses do not always accrue appropriate activational information from all the available sources within the time frame in which segmentation problem is normally resolved. The fluent aphasic performance, although quantitatively
lexical segmentation word_recognition fluent aphasia current report psycholinguistic study lexical segmentation word_recognition fluent aphasia listen normal run speech must identify individual word continuous stream extract linguistic message normal listener able resolve segmentation problem without noticeable difficulty consider fluent aphasic listener perform process lexical segmentation whether impaired comprehension speak_language provenance failure segment speech normally investigation compose series examine processing explicit acoustic prosodic cue word juncture feature affect listener segmentation speech stream implicitly inter lexical competition potential word match data_collect show lexical segmentation continuous speech compromise fluent aphasia word hypotheses always accrue appropriate information_available source within time_frame segmentation problem normally resolve fluent aphasic performance although quantitatively