Healthy Clinical Trial
Official title:
Investigations in Discourse Processes
This research trial will study discourse processing-that is, how the brain processes the
meaning of language. It will examine, for example, how words and sentences are interpreted
in cases where more than one meaning is possible. The study will include two parts:
1. An investigation of the role of the prefrontal cortex of the brain in discourse
processing will compare test performance of patients with prefrontal cortex damage with
that of healthy age-matched normal volunteers.
2. An investigation of the role of aging in discourse processing will compare test
performance of young healthy subjects (18 to 40 years old) with older healthy subjects
(41 to 80 years old).
All study candidates-both normal volunteers and patients with brain damage-must be at least
18 years old, speak English as their native language, have a high school degree or
equivalent (GED), read on a minimum fourth grade level and be right-handed.
Study candidates who have central nervous system disease, dysfunction or trauma will have a
routine history and neurological examination. They will also undergo neuropsychological
testing if they have not already done so. Patients with neurological damage who have not had
a magnetic resonance imaging (MRI) scan within six months or a year will be asked to undergo
this procedure.
Study participants will take verbal or written tests; sit in front of a computer screen and
press computer keys in response to what they are shown; answer questions from an examiner,
which may be tape-recorded; and fill out questionnaires. There will be rest breaks between
tasks. The studies will be spread over three to four days, with sessions lasting from 30
minutes to three hours.
This protocol is designed to acquire a better understanding of the underlying cognitive
mechanisms involved, and the roles of the prefrontal cortex and normal aging, on various
aspects of discourse processing. For Phase 1 of the investigations, two investigations will
be conducted: Study 1 will compare the performance of patients with prefrontal cortical
damage with age-matched healthy controls; Study 2 will compare the performance of young
healthy subjects with older healthy subjects in various aspects of on-line discourse
processing. The primary focus of our investigations will be on the cognitive mechanism of
suppression, which allows selection of appropriate meanings when information is ambiguous. A
secondary focus will be on the cognitive processes involved in comprehending explicit and
implicit information in stories and appreciating their thematic aspects. In addition, we are
interested in learning how individuals comprehend visual (pictorial) versus propositional
(textual) representations of relational language concepts (e.g., more/less, front/back).
From a cognitive neuroscience perspective, our interests are in investigating the roles of
both the prefrontal cortex (i.e., prefrontal lateral and orbitomedial areas of either
hemisphere) and the normal aging process in these aspects of discourse processing. We
predict that: (1) patients with frontal lobe lesions will have difficulty in suppressing
mental activation of inappropriate meanings of ambiguous text at various points during
ongoing processing; (2) aging reduces the efficiency of suppressing contextually
inappropriate meanings of ambiguous text; (3) prefrontal cortex damage will have deleterious
effects on processing implied information in stories and appreciating their thematic
aspects, and (4) prefrontal cortex damage will impair visual rather than propositional
representations of relational language concepts. Phase 2 of the investigations is designed
to extend study into other aspects of text processing as well as expands to the study and
analysis of discourse production. Our specific intents are to (1) investigate the processing
and use of context when encountering garden path phenomena in text; (2) understand the
nature of breakdowns in discourse production during story tell/retell using sequential
pictorial stimuli that probe for temporal sequencing of events, cohesive ties, cause/effect
relationships, anaphoric reference, inference, and gist; (3) understand what role the
prefrontal cortex plays in its ability to formulate a coherent representation in narrative
text inferencing tasks.
Our findings will be of value in contributing to knowledge about the neural representation
of the cognitive mechanisms underlying various aspects of discourse processes; advancing
clinical measurements that can pinpoint breakdowns in these processes as they occur in real
time, and understanding the effects of normal aging on discourse processes.
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