Poster C53, Sunday, March 25, 1:00-3:00 pm, Exhibit Hall C
The neural substrates for predictive processes in sentence comprehension
Chih-Ting Chang1, Ping Li2,3, Jie-Li Tsai4, En-Ju Lin5, Pei-Chun Chao1, Chia-Ju Chou1, Chia-Ying Lee1,4,5,6; 1Institute of Neuroscience, National Yang-Ming University, Taipei, Taiwan, 2Department of Psychology, Pennsylvania State University, University Park, PA, USA, 3Center for Brain, Behavior, and Cognition, Pennsylvania State University, University Park, PA, USA, 4Department of Psychology, National Chengchi University, Taiwan, 5Institute of Linguistics, Academia Sinica, Taipei, Taiwan, 6Institute of Cognitive Neuroscience, National Central University, Taipei, Taiwan
This study aimed to investigate the neural substrates of the predictive processes in sentence comprehension. Twenty-eight university students (10 males, mean age 21.94 years; range 19-26) served as participants in an fMRI study. Participants read a set of leading sentences for comprehension and had to predict the upcoming target word that should complete the sentence best within 4 seconds (2 TRs). The leading sentences provide either high (HP) or low predicative (LP) contextual information. A target word, which was rated as the best completion of the leading sentence in a separate norming study, would appear, and participants were required to decide whether the presented word was the same as participants’ prediction. The fMRI data revealed that, LP sentences led to greater activations in left inferior frontal gyrus (IFG), middle temporal gyrus (MTG), angular gyrus, and posterior cingulate indicating that the LP sentences posted greater cognitive demand on the reader. By contrast, HP sentences led to greater activations in left inferior temporal gyrus (ITG), bilateral temporo-occipital visual cortex that is implicated in orthographic processing, and in insula and IPL that are related for rule extraction and computation. The findings suggested that readers were able to take advantage of richer contextual information to predict the upcoming word. Furthermore, at the word level, LP target words, as compared with the HP words, showed greater activations in bilateral IFG, left STG, MTG, angular gyrus, supramarginal gyrus and SPL. Together, these data revealed the neural substrates of predictive processes in sentence comprehension.
Topic Area: LANGUAGE: Semantic