The role of coherence and cohesion in text comprehension: an event-related fMRI study
Cognitive Brain Research, (2001)Аннотация
Text processing requires inferences for establishing coherence between successive sentences. In neuropsychological studies and brain
imaging studies, these coherence-building processes have been ascribed to the right hemisphere. On the other hand, there is evidence for
prefrontal brain damage causing non-aphasic language disorders, in which text level processes are impaired. In this study, we used an
event-related, whole-head fMRI methodology to evaluate the contributions of prefrontal areas and the right hemisphere to coherence
building.We scanned 12 participants while they read 120 sentence pairs and judged their coherence. Four conditions were used, resulting
from crossing coherence and cohesion (i.e. the presence of a lexical connection). A behavioral pretest confirmed that cohesion aided
establishing coherence, whereas it hindered the detection of coherence breaks. In the fMRI study, all language conditions yielded
activation in left frontolateral and temporolateral regions, when compared to a physical control task. The differences due to coherence of
the sentence pairs were most evident in larger activation for coherent as compared to incoherent sentence pairs in the left frontomedian
wall, but also in posterior cingulate and precuneal regions. Finally, a left inferior prefrontal area was sensitive to the difficulty of the task,
and in particular to the increase in processing costs when cohesion falsely indicated coherence. These results could not provide evidence
for a special involvement of the right hemisphere during inferencing. Rather, they suggest that the left frontomedian cortex plays an
important role in coherence building.