scholarly journals Predictive Coding Over the Lifespan: Increased Reliance on Perceptual Priors in Older Adults—A Magnetoencephalography and Dynamic Causal Modeling Study

2021 ◽  
Vol 13 ◽  
Author(s):  
Jason S. Chan ◽  
Michael Wibral ◽  
Cerisa Stawowsky ◽  
Mareike Brandl ◽  
Saskia Helbling ◽  
...  
Keyword(s):  
Older Adults ◽  
Life Experience ◽  
Predictive Coding ◽  
Sensory Information ◽  
Causal Modeling ◽  
Beta Band ◽  
Dynamic Causal Modeling ◽  
Younger Adults ◽  
Illusory Percept ◽  
Band Activity

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.

scholarly journals Predictive coding over the lifespan: Increased reliance on perceptual priors in older adults – a magnetoencephalography and dynamic causal modelling study

2017 ◽  
Author(s):  
Jason S. Chan ◽  
Michael Wibral ◽  
Patricia Wollstadt ◽  
Cerisa Stawowsky ◽  
Mareike Brandl ◽  
...  
Keyword(s):  
Older Adults ◽  
Life Experience ◽  
Predictive Coding ◽  
Sensory Information ◽  
Younger Adults ◽  
Effective Strategies ◽  
Adult Participants ◽  
Illusory Percept ◽  
The Cost ◽  
Band Activity

AbstractAging is accompanied by unisensory decline; but 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 predictive coding (PC) 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, but they come at the cost of integrating irrelevant information. Their role 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 yrs) and older (mean: 67 yrs) adult participants while recording the magnetoencephalogram. Older adults perceived more illusions than younger adults. Older adults had increased pre-stimulus beta(β)-band activity compared to younger adults as predicted by microcircuit theories of predictive coding, which suggest priors and predictions are linked to β-band activity. In line with our hypothesis, transfer entropy analysis and dynamic causal models of pre-stimulus MEG 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 that is leading to the illusory percept.

scholarly journals Aging and Sensitivity to Illusory Target Motion With or Without Secondary Tasks

2018 ◽  
Vol 31 (3-4) ◽  
pp. 227-249 ◽  
Author(s):  
Alix L. de Dieuleveult ◽  
Anne-Marie Brouwer ◽  
Petra C. Siemonsma ◽  
Jan B. F. van Erp ◽  
Eli Brenner
Keyword(s):  
Older Adults ◽  
Visual Information ◽  
Sensory Information ◽  
Older Individuals ◽  
Younger Adults ◽  
Secondary Tasks ◽  
Healthy Older Adults ◽  
The Right ◽  
Task Irrelevant ◽  
Background Motion

Older individuals seem to find it more difficult to ignore inaccurate sensory cues than younger individuals. We examined whether this could be quantified using an interception task. Twenty healthy young adults (age 18–34) and twenty-four healthy older adults (age 60–82) were asked to tap on discs that were moving downwards on a screen with their finger. Moving the background to the left made the discs appear to move more to the right. Moving the background to the right made them appear to move more to the left. The discs disappeared before the finger reached the screen, so participants had to anticipate how the target would continue to move. We examined how misjudging the disc’s motion when the background moves influenced tapping. Participants received veridical feedback about their performance, so their sensitivity to the illusory motion indicates to what extent they could ignore the task-irrelevant visual information. We expected older adults to be more sensitive to the illusion than younger adults. To investigate whether sensorimotor or cognitive load would increase this sensitivity, we also asked participants to do the task while standing on foam or counting tones. Background motion influenced older adults more than younger adults. The secondary tasks did not increase the background’s influence. Older adults might be more sensitive to the moving background because they find it more difficult to ignore irrelevant sensory information in general, but they may rely more on vision because they have less reliable proprioceptive and vestibular information.

scholarly journals Information theoretic evidence for predictive coding in the face processing system

2016 ◽  
Author(s):  
Alla Brodski-Guerniero ◽  
Georg-Friedrich Paasch ◽  
Patricia Wollstadt ◽  
Ipek Özdemir ◽  
Joseph T. Lizier ◽  
...  
Keyword(s):  
Prior Knowledge ◽  
Human Subjects ◽  
Brain Area ◽  
Predictive Coding ◽  
Sensory Information ◽  
Low Frequency ◽  
Processing System ◽  
Information Storage ◽  
Beta Band ◽  
The Brain

AbstractPredictive coding suggests that the brain infers the causes of its sensations by combining sensory evidence with internal predictions based on available prior knowledge. However, the neurophysiological correlates of (pre-)activated prior knowledge serving these predictions are still unknown. Based on the idea that such pre-activated prior knowledge must be maintained until needed we measured the amount of maintained information in neural signals via the active information storage (AIS) measure. AIS was calculated on whole-brain beamformer-reconstructed source time-courses from magnetoencephalography (MEG) recordings of 52 human subjects during the baseline of a Mooney face/house detection task. Pre-activation of prior knowledge for faces showed as alpha- and beta-band related AIS increases in content specific areas; these AIS increases were behaviourally relevant in brain area FFA. Further, AIS allowed decoding of the cued category on a trial-by-trial basis. Moreover, top-down transfer of predictions estimated by transfer entropy was associated with beta frequencies. Our results support accounts that activated prior knowledge and the corresponding predictions are signalled in low-frequency activity (<30 Hz).Significance statementOur perception is not only determined by the information our eyes/retina and other sensory organs receive from the outside world, but strongly depends also on information already present in our brains like prior knowledge about specific situations or objects. A currently popular theory in neuroscience, predictive coding theory, suggests that this prior knowledge is used by the brain to form internal predictions about upcoming sensory information. However, neurophysiological evidence for this hypothesis is rare – mostly because this kind of evidence requires making strong a-priori assumptions about the specific predictions the brain makes and the brain areas involved. Using a novel, assumption-free approach we find that face-related prior knowledge and the derived predictions are represented and transferred in low-frequency brain activity.

scholarly journals Event Centrality of Positive and Negative Autobiographical Memories in Older Adulthood

2021 ◽  
Vol 5 (Supplement_1) ◽  
pp. 712-712
Author(s):  
Justina Pociunaite ◽  
Tabea Wolf
Keyword(s):  
Older Adults ◽  
Individual Differences ◽  
Life Experience ◽  
Age Groups ◽  
Openness To Experience ◽  
Middle Aged ◽  
Younger Adults ◽  
Age Related ◽  
Middle Aged Adults ◽  
Positive Memories

Abstract Centrality of an event (CE) is a characteristic denoting how important a life experience is to one’s identity. Usually, positive memories are more central than negative ones in the community samples. Nevertheless, there is emerging evidence showing substantial individual differences in how one perceives CE. Especially regarding age, one could expect pronounced differences due to age-related changes in personal goals. In this study, we investigated how older adults differ from young and middle-aged adults. Apart from age, we tested whether personality traits such as neuroticism and openness to experience influence the CE ratings among age groups. The sample comprised of 363 German participants, age ranging from 18 to 89 (M=49.57, SD=17.087), 67.2 % of the sample were women. Using multilevel analysis, we found the CE of positive memories to be higher in all age groups. The CE of positive events significantly differed for older adults compared to younger adults but not to the middle-aged group. With respect to personality, neuroticism had an impact only on the CE of negative memories in younger and middle-aged adults. For older adults, neither neuroticism, nor openness to experience had an impact on CE ratings. This shows that while older adults significantly differ from younger adults in the CE of positive memories, other individual differences characteristics do not have an impact on the way older adults perceive memories as central to their identity.

scholarly journals Some personal life events are more prominent than others: Younger and older adults agree on which life events matter most

2018 ◽  
Vol 13 (4) ◽  
pp. 551-569
Author(s):  
Sharda Umanath ◽  
Dorthe Berntsen
Keyword(s):  
Older Adults ◽  
Autobiographical Memory ◽  
Life Events ◽  
Life Experience ◽  
Life Story ◽  
Personal Life ◽  
Younger Adults ◽  
Cultural Life ◽  
Life Script

Some important life events are part of the cultural life script as expected transitional events with culturally sanctioned timing. However, not all personally important events align with the cultural life script, including some events that are widely experienced. Here, we ask whether there are specific characteristics that define the events that become part of a culture’s life script and what role life experience plays. In Experiment 1, younger adults rated life events on different measures tapping central event dimensions in autobiographical memory theories. Cross-culturally extremely frequent cultural life script events consistently received higher ratings than other commonly experienced life story events. Experiment 2 demonstrated that these findings did not interact with age. Both younger and older adults rated the extreme cultural life script events most highly. In addition, older adults rated all types of life events more highly than younger adults, suggesting a greater appreciation of life events overall.

scholarly journals Alpha-to-beta- and gamma-band activity reflect predictive coding in affective visual processing

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Andreas Strube ◽  
Michael Rose ◽  
Sepideh Fazeli ◽  
Christian Büchel
Keyword(s):  
Visual Processing ◽  
Predictive Coding ◽  
Stimulus Presentation ◽  
Gamma Band ◽  
Prediction Errors ◽  
Beta Band ◽  
Picture Processing ◽  
Gamma Band Activity ◽  
Spectral Patterns ◽  
Band Activity

AbstractProcessing of negative affective pictures typically leads to desynchronization of alpha-to-beta frequencies (ERD) and synchronization of gamma frequencies (ERS). Given that in predictive coding higher frequencies have been associated with prediction errors, while lower frequencies have been linked to expectations, we tested the hypothesis that alpha-to-beta ERD and gamma ERS induced by aversive pictures are associated with expectations and prediction errors, respectively. We recorded EEG while volunteers were involved in a probabilistically cued affective picture task using three different negative valences to produce expectations and prediction errors. Our data show that alpha-to-beta band activity after stimulus presentation was related to the expected valence of the stimulus as predicted by a cue. The absolute mismatch of the expected and actual valence, which denotes an absolute prediction error was related to increases in alpha, beta and gamma band activity. This demonstrates that top-down predictions and bottom-up prediction errors are represented in typical spectral patterns associated with affective picture processing. This study provides direct experimental evidence that negative affective picture processing can be described by neuronal predictive coding computations.

scholarly journals The functional anatomy of schizophrenia: A dynamic causal modeling study of predictive coding

2014 ◽  
Vol 158 (1-3) ◽  
pp. 204-212 ◽  
Author(s):  
Noa Fogelson ◽  
Vladimir Litvak ◽  
Avi Peled ◽  
Miguel Fernandez-del-Olmo ◽  
Karl Friston
Keyword(s):  
Predictive Coding ◽  
Functional Anatomy ◽  
Causal Modeling ◽  
Dynamic Causal Modeling ◽  
Modeling Study

scholarly journals Dynamic Causal Modeling of the Response to Frequency Deviants

2009 ◽  
Vol 101 (5) ◽  
pp. 2620-2631 ◽  
Author(s):  
Marta I. Garrido ◽  
James M. Kilner ◽  
Stefan J. Kiebel ◽  
Karl J. Friston
Keyword(s):  
Mismatch Negativity ◽  
Sensory Input ◽  
Model Comparison ◽  
Memory Trace ◽  
Effective Connectivity ◽  
Predictive Coding ◽  
Causal Modeling ◽  
Evoked Responses ◽  
Dynamic Causal Modeling ◽  
The Brain

This article describes the use of dynamic causal modeling to test hypotheses about the genesis of evoked responses. Specifically, we consider the mismatch negativity (MMN), a well-characterized response to deviant sounds and one of the most widely studied evoked responses. There have been several mechanistic accounts of how the MMN might arise. It has been suggested that the MMN results from a comparison between sensory input and a memory trace of previous input, although others have argued that local adaptation, due to stimulus repetition, is sufficient to explain the MMN. Thus the precise mechanisms underlying the generation of the MMN remain unclear. This study tests some biologically plausible spatiotemporal dipole models that rest on changes in extrinsic top-down connections (that enable comparison) and intrinsic changes (that model adaptation). Dynamic causal modeling suggested that responses to deviants are best explained by changes in effective connectivity both within and between cortical sources in a hierarchical network of distributed sources. Our model comparison suggests that both adaptation and memory comparison operate in concert to produce the early (N1 enhancement) and late (MMN) parts of the response to frequency deviants. We consider these mechanisms in the light of predictive coding and hierarchical inference in the brain.

scholarly journals Alpha-to-beta- and gamma-band activity reflect predictive coding in affective visual processing

2021 ◽  
Author(s):  
Andreas Strube ◽  
Michael Rose ◽  
Sepideh Fazeli ◽  
Christian Büchel
Keyword(s):  
Visual Processing ◽  
Predictive Coding ◽  
Gamma Band ◽  
Prediction Errors ◽  
Beta Band ◽  
Picture Processing ◽  
Gamma Frequencies ◽  
Gamma Band Activity ◽  
Spectral Patterns ◽  
Band Activity

Processing of negative affective pictures typically leads to desynchronization of alpha-to-beta frequencies (ERD) and synchronization of gamma frequencies (ERS). Given that in predictive coding higher frequencies have been associated with prediction errors, while lower frequencies have been linked to expectations, we tested the hypothesis that alpha-to-beta ERD and gamma ERS induced by aversive pictures are associated with expectations and prediction errors, respectively. We recorded EEG while volunteers were involved in a probabilistically cued affective picture task using three different negative valences to produce expectations and prediction errors. Our data show that alpha-to-beta band activity was related to the expected valence of the stimulus as predicted by a cue. The absolute mismatch of the expected and actual valence, which denotes an absolute prediction error was related to gamma band activity. This demonstrates that top-down predictions and bottom-up prediction errors are represented in specific spectral patterns associated with affective picture processing.

Cognitive Load Affects Speech Motor Performance Differently in Older and Younger Adults

2019 ◽  
Vol 62 (5) ◽  
pp. 1258-1277 ◽  
Author(s):  
Megan K. MacPherson
Keyword(s):  
Older Adults ◽  
Cognitive Load ◽  
Motor Performance ◽  
Age Groups ◽  
Incongruent Condition ◽  
Sentence Production ◽  
Movement Duration ◽  
Production Task ◽  
Younger Adults ◽  
Speech Motor

PurposeThe aim of this study was to determine the impact of cognitive load imposed by a speech production task on the speech motor performance of healthy older and younger adults. Response inhibition, selective attention, and working memory were the primary cognitive processes of interest.MethodTwelve healthy older and 12 healthy younger adults produced multiple repetitions of 4 sentences containing an embedded Stroop task in 2 cognitive load conditions: congruent and incongruent. The incongruent condition, which required participants to suppress orthographic information to say the font colors in which color words were written, represented an increase in cognitive load relative to the congruent condition in which word text and font color matched. Kinematic measures of articulatory coordination variability and movement duration as well as a behavioral measure of sentence production accuracy were compared between groups and conditions and across 3 sentence segments (pre-, during-, and post-Stroop).ResultsIncreased cognitive load in the incongruent condition was associated with increased articulatory coordination variability and movement duration, compared to the congruent Stroop condition, for both age groups. Overall, the effect of increased cognitive load was greater for older adults than younger adults and was greatest in the portion of the sentence in which cognitive load was manipulated (during-Stroop), followed by the pre-Stroop segment. Sentence production accuracy was reduced for older adults in the incongruent condition.ConclusionsIncreased cognitive load involving response inhibition, selective attention, and working memory processes within a speech production task disrupted both the stability and timing with which speech was produced by both age groups. Older adults' speech motor performance may have been more affected due to age-related changes in cognitive and motoric functions that result in altered motor cognition.

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