.png){kind=icon}
返回
Data-driven machine learning models for decoding speech categorization from evoked brain responses
.png){kind=icon}
OA
AI
DOI：10.1088/1741-2552/abecf0.png)
.png){kind=icon}
原文求助.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
Objective. Categorical perception (CP) of audio is critical to understand how the human brain perceives speech sounds despite widespread variability in acoustic properties. Here, we investigated the spatiotemporal characteristics of auditory neural activity that reflects CP for speech (i.e. differentiates phonetic prototypes from ambiguous speech sounds). Approach. We recorded 64-channel electroencephalograms as listeners rapidly classified vowel sounds along an acoustic-phonetic continuum. We used support vector machine classifiers and stability selection to determine when and where in the brain CP was best decoded across space and time via source-level analysis of the event-related potentials. Main results. We found that early (120 ms) whole-brain data decoded speech categories (i.e. prototypical vs. ambiguous tokens) with 95.16% accuracy (area under the curve 95.14%; F1-score 95.00%). Separate analyses on left hemisphere (LH) and right hemisphere (RH) responses showed that LH decoding was more accurate and earlier than RH (89.03% vs. 86.45% accuracy; 140 ms vs. 200 ms). Stability (feature) selection identified 13 regions of interest (ROIs) out of 68 brain regions [including auditory cortex, supramarginal gyrus, and inferior frontal gyrus (IFG)] that showed categorical representation during stimulus encoding (0-260 ms). In contrast, 15 ROIs (including fronto-parietal regions, IFG, motor cortex) were necessary to describe later decision stages (later 300-800 ms) of categorization but these areas were highly associated with the strength of listeners' categorical hearing (i.e. slope of behavioral identification functions). Significance. Our data-driven multivariate models demonstrate that abstract categories emerge surprisingly early (similar to 120 ms) in the time course of speech processing and are dominated by engagement of a relatively compact fronto-temporal-parietal brain network.
Keyword:
auditory event-related potentials (ERPs)
categorical perception
decision process
behavioral slope
machine learning
stability selection
support vector machine (SVM)
期刊
IF:
3.8
论文数:
4.0K
被引数:
1.4W
机构
引用论文
Distinct regional anatomic and functional correlates of neurodegenerative apraxia of speech and aphasia: An MRI and FDG-PET study语言和失语的神经退行性失用症的不同区域解剖和功能相关性: MRI和fdg-pet研究.png)
BRAIN AND LANGUAGE
OAAI
BRAIN AND LANGUAGEIF2.3
OAAI分享收藏
查看更多内容