TY  - JOUR
A1  - Chan, Jason S.
A1  - Wibral, Michael
A1  - Stawowsky, Cerisa
A1  - Brandl, Mareike
A1  - Helbling, Saskia
A1  - Naumer, Marcus Johannes
A1  - Kaiser, Jochen
A1  - Wollstadt, Patricia
T1  - Predictive coding over the lifespan : increased reliance on perceptual priors in older adults ; a magnetoencephalography and dynamic causal modeling study
T2  - Frontiers in aging neuroscience
N2  - Aging is accompanied by unisensory decline. To compensate for this, two complementary strategies are potentially relied upon increasingly: first, older adults integrate more information from different sensory organs. Second, according to the predictive coding (PC) model, we form “templates” (internal models or “priors”) of the environment through our experiences. It is through increased life experience that older adults may rely more on these templates compared to younger adults. Multisensory integration and predictive coding would be effective strategies for the perception of near-threshold stimuli, which may however come at the cost of integrating irrelevant information. Both strategies can be studied in multisensory illusions because these require the integration of different sensory information, as well as an internal model of the world that can take precedence over sensory input. Here, we elicited a classic multisensory illusion, the sound-induced flash illusion, in younger (mean: 27 years, N = 25) and older (mean: 67 years, N = 28) adult participants while recording the magnetoencephalogram. Older adults perceived more illusions than younger adults. Older adults had increased pre-stimulus beta-band activity compared to younger adults as predicted by microcircuit theories of predictive coding, which suggest priors and predictions are linked to beta-band activity. Transfer entropy analysis and dynamic causal modeling of pre-stimulus magnetoencephalography data revealed a stronger illusion-related modulation of cross-modal connectivity from auditory to visual cortices in older compared to younger adults. We interpret this as the neural correlate of increased reliance on a cross-modal predictive template in older adults leading to the illusory percept.
KW  - sound-induced flash illusion
KW  - aging
KW  - multisensory integration
KW  - dynamic causal modeling
KW  - magnetoencephalography
KW  - transfer entropy
KW  - predictive coding
KW  - beta-band activity
Y1  - 2021
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/61129
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-611293
SN  - 1663-4365
VL  - 13
IS  - art. 631599
SP  - 1
EP  - 14
PB  - Frontiers Research Foundation
CY  - Lausanne
ER  -