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Hum Brain Mapp. 2016 Feb;37(2):704-16. doi: 10.1002/hbm.23060. Epub 2015 Nov 19.

Predictions interact with missing sensory evidence in semantic processing areas.

Author information

1
Max Planck Research Group "Auditory Cognition," Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany.
2
Department of Language and Literature, Max Planck Institute for Empirical Aesthetics, Frankfurt, Germany.
3
Department of Physics, School of Natural Sciences, Chemnitz University of Technology, Chemnitz, Germany.
4
Department of Psychology, Brain and Mind Institute, University of Western Ontario, London, Canada.
5
Nuclear Magnetic Resonance Unit, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany.
6
Department of Psychology, University of Lübeck, Lübeck, Germany.

Abstract

Human brain function draws on predictive mechanisms that exploit higher-level context during lower-level perception. These mechanisms are particularly relevant for situations in which sensory information is compromised or incomplete, as for example in natural speech where speech segments may be omitted due to sluggish articulation. Here, we investigate which brain areas support the processing of incomplete words that were predictable from semantic context, compared with incomplete words that were unpredictable. During functional magnetic resonance imaging (fMRI), participants heard sentences that orthogonally varied in predictability (semantically predictable vs. unpredictable) and completeness (complete vs. incomplete, i.e. missing their final consonant cluster). The effects of predictability and completeness interacted in heteromodal semantic processing areas, including left angular gyrus and left precuneus, where activity did not differ between complete and incomplete words when they were predictable. The same regions showed stronger activity for incomplete than for complete words when they were unpredictable. The interaction pattern suggests that for highly predictable words, the speech signal does not need to be complete for neural processing in semantic processing areas. Hum Brain Mapp 37:704-716, 2016.

KEYWORDS:

angular gyrus; fMRI; incomplete speech; predictive mechanisms; semantic context; sentence processing

PMID:
26583355
DOI:
10.1002/hbm.23060
[Indexed for MEDLINE]

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