Verb Tense Production in People With Nonfluent Aphasia Across Different Discourse Elicitation Tasks

Area of Science:

• Linguistics
• Neurology
• Speech-Language Pathology

Background:

• Verb tense production is frequently impaired in individuals with nonfluent aphasia.
• Previous research on selective past tense impairment in this population yields inconsistent results, especially at the discourse level.
• Discourse elicitation tasks may influence language production, but their impact on verb tense in nonfluent aphasia is not well understood.

Purpose of the Study:

• To investigate verb tense production patterns across different discourse elicitation tasks in individuals with nonfluent aphasia.
• To compare verb tense production in nonfluent aphasia with that of individuals without aphasia.
• To understand the potential influence of discourse task demands on verb tense production in nonfluent aphasia.

Main Methods:

• Utilized language samples from the AphasiaBank database.
• Included 23 participants with nonfluent aphasia and 27 participants without aphasia.
• Analyzed six discourse tasks, calculating ratios of past, present, future, imperative, and unknown verb types.

Main Results:

• Confirmed verb tense production deficits and a selective past tense impairment in individuals with nonfluent aphasia.
• Observed significant discourse task effects in individuals without aphasia, but minimal effects in those with nonfluent aphasia.
• Hypothesized that reduced overall verb production and overreliance on present tense contribute to the lack of task effects in nonfluent aphasia.

Conclusions:

• Verb tense production deficits, including selective past tense impairment, are evident in nonfluent aphasia.
• Discourse task demands appear to have a limited impact on verb tense production in nonfluent aphasia, possibly due to altered production strategies.
• Findings highlight methodological considerations for evaluating verb tense production in nonfluent aphasia using discourse tasks.