TY - JOUR
T1 - Mental imagery of speech implicates two mechanisms of perceptual reactivation
AU - Tian, Xing
AU - Zarate, Jean Mary
AU - Poeppel, David
N1 - Funding Information:
We thank Keith Sanzenbach for his technical assistance with fMRI recording, Tobias Overath and Thomas Schofield for their discussion and guidance with fMRI analyses, and Jess Rowland for her comments on this manuscript. This study was supported by MURI ARO # 54228-LS-MUR , NIH 2R01DC 05660 , a grant from the GRAMMY Foundation ® , Major Projects Program of the Shanghai Municipal Science and Technology Commission (STCSM) 15JC1400104 and National Natural Science Foundation of China 31500914 .
Publisher Copyright:
© 2016 Elsevier Ltd.
PY - 2016/4/1
Y1 - 2016/4/1
N2 - Sensory cortices can be activated without any external stimuli. Yet, it is still unclear how this perceptual reactivation occurs and which neural structures mediate this reconstruction process. In this study, we employed fMRI with mental imagery paradigms to investigate the neural networks involved in perceptual reactivation. Subjects performed two speech imagery tasks: articulation imagery (AI) and hearing imagery (HI). We found that AI induced greater activity in frontal-parietal sensorimotor systems, including sensorimotor cortex, subcentral (BA 43), middle frontal cortex (BA 46) and parietal operculum (PO), whereas HI showed stronger activation in regions that have been implicated in memory retrieval: middle frontal (BA 8), inferior parietal cortex and intraparietal sulcus. Moreover, posterior superior temporal sulcus (pSTS) and anterior superior temporal gyrus (aSTG) was activated more in AI compared with HI, suggesting that covert motor processes induced stronger perceptual reactivation in the auditory cortices. These results suggest that motor-to-perceptual transformation and memory retrieval act as two complementary mechanisms to internally reconstruct corresponding perceptual outcomes. These two mechanisms can serve as a neurocomputational foundation for predicting perceptual changes, either via a previously learned relationship between actions and their perceptual consequences or via stored perceptual experiences of stimulus and episodic or contextual regularity.
AB - Sensory cortices can be activated without any external stimuli. Yet, it is still unclear how this perceptual reactivation occurs and which neural structures mediate this reconstruction process. In this study, we employed fMRI with mental imagery paradigms to investigate the neural networks involved in perceptual reactivation. Subjects performed two speech imagery tasks: articulation imagery (AI) and hearing imagery (HI). We found that AI induced greater activity in frontal-parietal sensorimotor systems, including sensorimotor cortex, subcentral (BA 43), middle frontal cortex (BA 46) and parietal operculum (PO), whereas HI showed stronger activation in regions that have been implicated in memory retrieval: middle frontal (BA 8), inferior parietal cortex and intraparietal sulcus. Moreover, posterior superior temporal sulcus (pSTS) and anterior superior temporal gyrus (aSTG) was activated more in AI compared with HI, suggesting that covert motor processes induced stronger perceptual reactivation in the auditory cortices. These results suggest that motor-to-perceptual transformation and memory retrieval act as two complementary mechanisms to internally reconstruct corresponding perceptual outcomes. These two mechanisms can serve as a neurocomputational foundation for predicting perceptual changes, either via a previously learned relationship between actions and their perceptual consequences or via stored perceptual experiences of stimulus and episodic or contextual regularity.
KW - Internal forward model/efference copy/corollary discharge
KW - Memory retrieval
KW - Mental simulation
KW - Prediction
KW - Sensorimotor integration
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U2 - 10.1016/j.cortex.2016.01.002
DO - 10.1016/j.cortex.2016.01.002
M3 - Article
C2 - 26889603
AN - SCOPUS:84960334544
SN - 0010-9452
VL - 77
SP - 1
EP - 12
JO - Cortex
JF - Cortex
ER -