Statistical learning (SL) is the ability to detect and learn regularities from input and is foundational to language acquisition. Despite the dominant role of SL as a theoretical construct for language development, there is a lack of direct evidence supporting the shared neural substrates underlying language processing and SL. It is also not clear whether the similarities, if any, are related to linguistic processing, or statistical regularities in general. The current study tests whether the brain regions involved in natural language processing are similarly recruited during auditory, linguistic SL. Twenty-two adults performed an auditory linguistic SL task, an auditory nonlinguistic SL task, and a passive story listening task as their neural activation was monitored. Within the language network, the left posterior temporal gyrus showed sensitivity to embedded speech regularities during auditory, linguistic SL, but not auditory, nonlinguistic SL. Using a multivoxel pattern similarity analysis, we uncovered similarities between the neural representation of auditory, linguistic SL, and language processing within the left posterior temporal gyrus. No other brain regions showed similarities between linguistic SL and language comprehension, suggesting that a shared neurocomputational process for auditory SL and natural language processing within the left posterior temporal gyrus is specific to linguistic stimuli.
Are the brain bases of language comprehension the same across all human languages, or do these bases vary in a way that corresponds to differences in linguistic typology? English and Mandarin Chinese attest such a typological difference in the domain of relative clauses. Using functional magnetic resonance imaging with English and Chinese participants, who listened to the same translation-equivalent story, we analyzed neuroimages time aligned to object-extracted relative clauses in both languages. In a general linear model analysis of these naturalistic data, comprehension was selectively associated with increased hemodynamic activity in left posterior temporal lobe, angular gyrus, inferior frontal gyrus, precuneus, and posterior cingulate cortex in both languages. This result suggests the processing of object-extracted relative clauses is subserved by a common collection of brain regions, regardless of typology. However, there were also regions that were activated uniquely in our Chinese participants albeit not to a significantly greater degree. These were in the temporal lobe. These Chinese-specific results could reflect structural ambiguity-resolution work that must be done in Chinese but not English object-extracted relative clauses.
more » « less- NSF-PAR ID:
- 10427169
- Publisher / Repository:
- DOI PREFIX: 10.1162
- Date Published:
- Journal Name:
- Neurobiology of Language
- Volume:
- 4
- Issue:
- 3
- ISSN:
- 2641-4368
- Page Range / eLocation ID:
- p. 455-473
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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Objectives: Bringing linguistic experience into code-switching (CS) constraints, a new hypothesis considers cross-language variable equivalence, which arises from within-language variability. Bilingual choices are assessed for Spanish-English CS between clauses, where subordinating conjunctions may not be consistently equivalent.
Methodology: Equivalence exists at the main-and-adverbial clause junction, inasmuch as the conjunctions are consistently present and placed the same way in the two languages. Equivalence is variable with main-and-complement clauses, because English complementizer that is mostly absent. Tokens of clause combining were extracted from the prosodically transcribed speech of members of a long-standing community in northern New Mexico who use both languages in their everyday interactions. Bilingual clause combinations were compared with their unilingual counterparts produced by the same speakers, as benchmarks.
Data and Analysis: Over 2,000 tokens of clause combining were coded for conjunction, subordinate clause type, prosodic connection, and CS direction for bilingual instances ( n = 189).
Findings: Bilinguals treat CS with complement and adverbial clauses differently. With complement clauses, the rate of CS is lower, prosodic separation is greater and, most notably, conjunction language choice is more asymmetrical. Spanish complementizer que is overwhelmingly selected over English that. In contrast, choice between causal conjunctions porque and (be)cause is affected by CS direction.
Originality: The Variable Equivalence hypothesis states that bilinguals favor CS with the equivalent option from one of the languages that is more frequent and predictable in their combined linguistic experience, considering both languages.
Significance: CS constraints are probabilistic (preferred CS sites) rather than categorical (permissible CS sites). The Variable Equivalence hypothesis accommodates variation in actual language use. Methodologically, comparing spontaneous CS with the same speakers’ unilingual production allows discovery of CS asymmetries. These asymmetries reveal quantitative bilingual preferences to switch at particular sites.
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