The two sides of prediction: Evidence from MEG and fMRI
Abstract: Despite broad agreement that prediction plays an important role in language, many open questions remain about these predictions interact with new language input in the brain. In this study, we used MEG, along with a preliminary analysis of fMRI, to determine whether there are spatiotemporally distinct patterns of neural activity to words confirming or disconfirming predictions made follo... read morewing discourse contexts. We find this to be true: In the N400 time window, we saw modulation of activity in both the lateral and medial temporal lobes to the contrasts between predicted words and a) words that were unpredicted following a non-constraining context and b) words which violated predictions after constraining contexts. Between 600 and 1000 ms, we saw modulation of activity in both the left inferior frontal cortex and left lateral temporal cortex selectively to the contrast between predicted words and words that strongly violated prior predictions. Results from fMRI partially match, providing a complementary view of neural activity. We discuss each of these findings in turn, along with possible implications for predictive processing.
Thesis (M.S.)--Tufts University, 2018.
Submitted to the Dept. of Psychology.
Advisor: Gina Kuperberg.
Committee: Elizabeth Race, Lotte Schoot, and Lin Wang.
Keywords: Psychology, Neurosciences, and Linguistics.read less