Cited by 350Face Recognition and PerceptionVisual perception and processing mechanismsNeural and Behavioral Psychology Studies

Expectation and Surprise Determine Neural Population Responses in the Ventral Visual Stream

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Egner, Tobias, Monti, Jim M., Summerfield, Christopher·2010·The Journal of Neuroscience

Abstract

Visual cortex is traditionally viewed as a hierarchy of neural feature detectors, with neural population responses being driven by bottom-up stimulus features. Conversely, “predictive coding” models propose that each stage of the visual hierarchy harbors two computationally distinct classes of processing unit: representational units that encode the conditional probability of a stimulus and provide predictions to the next lower level; and error units that encode the mismatch between predictions and bottom-up evidence, and forward prediction error to the next higher level. Predictive coding therefore suggests that neural population responses in category-selective visual regions, like the fusiform face area (FFA), reflect a summation of activity related to prediction (“face expectation”) and prediction error (“face surprise”), rather than a homogenous feature detection response. We tested the rival hypotheses of the feature detection and predictive coding models by collecting functional magnetic resonance imaging data from the FFA while independently varying both stimulus features (faces vs houses) and subjects' perceptual expectations regarding those features (low vs medium vs high face expectation). The effects of stimulus and expectation factors interacted, whereby FFA activity elicited by face and house stimuli was indistinguishable under high face expectation and maximally differentiated under low face expectation. Using computational modeling, we show that these data can be explained by predictive coding but not by feature detection models, even when the latter are augmented with attentional mechanisms. Thus, population responses in the ventral visual stream appear to be determined by feature expectation and surprise rather than by stimulus features per se.

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Crossref · 10.1523/jneurosci.2770-10.2010

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  • The full pattern of effects in Egner et al. was best explained by a PP model in which BOLD responses were dominated by strong prediction-driven face-selective expectation unit activity and weak face-selective error unit activity on both trial types.

    “The full pattern of effects was best explained by a PP model in which BOLD responses were dominated by strong prediction‐driven, face‐selective expectation unit activity and weak face‐selective error unit activity on both trial types (since houses would evoke minimal error signals from face‐selective cells).”

    From Evaluating the neurophysiological evidence for predictive processing as a model of perception (2020) · cites this paper as [76]

    The Results (Modeling data) report the opposite weighting: face-surprise (error) activity contributed about twice as strongly to FFA BOLD responses as face-expectation activity. Materials and Methods says the model assigned zero face-selective error response to house trials, rather than weak error activity on both trial types. (LLM, conf=0.94)

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  • Egner et al. observed FFA responses to faces and houses were statistically indistinguishable when those stimuli were expected.

    “The authors also made the surprising observation that, despite its well‐established role in face processing, 86 FFA responses to faces and houses were statistically indistinguishable when those stimuli were expected.”

    From Evaluating the neurophysiological evidence for predictive processing as a model of perception (2020) · cites this paper as [76]

    The Results (fMRI data; page unavailable) report that FFA responses to faces and houses were statistically indistinguishable under high face expectation (t(15) = 0.4, p > 0.1). The qualifier matters: faces were expected in that condition, but houses were less likely, so the paper does not show that the responses were indistinguishable when both stimuli were expected. (LLM, conf=0.88)

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  • A number of human studies have demonstrated that magnitude of stimulus-evoked responses is inversely proportional to degree to which stimulus was expected.

    “and a number of human studies have demonstrated that the magnitude of stimulus‐evoked responses is inversely proportional to the degree to which the stimulus was expected 75 , 76 , 83 , 84”

    From Evaluating the neurophysiological evidence for predictive processing as a model of perception (2020) · cites this paper as [76]

    In Results > Modeling data, the paper says that greater probability of a face was associated with less FFA activity. But Results > fMRI data reports no overall main effect of expectation: the linear finding concerns the difference between face- and house-evoked responses, not a general inverse relationship between response magnitude and how expected any stimulus was. The source therefore supports the claim for a specific stimulus and brain region, but not its unqualified form. (LLM, conf=0.85)

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  • Many studies have reported that stimulus-evoked responses are inversely proportional to degree to which stimulus was expected, although this effect is not universally observed.

    “Indeed, as mentioned above, many studies have reported that stimulus‐evoked responses are inversely proportional to the degree to which the stimulus was expected, 47 , 75 , 76 , 83 , 84 , 85 , 98 although this effect is not universally observed. 79 , 82”

    From Evaluating the neurophysiological evidence for predictive processing as a model of perception (2020) · cites this paper as [76]

    The Results (fMRI data; page unavailable) show that face-versus-house response differences in the FFA increased linearly as face expectation decreased. But the paper reports no main effect of expectation on FFA responses, so it does not establish that stimulus-evoked responses generally decrease in proportion to how expected a stimulus is. The sentence’s caveat about effects not being universally observed is attached to other citations. (LLM, conf=0.84)

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  • Egner et al. show that neurons in the fusiform face area respond every bit as strongly to non-face house stimuli under high expectation of faces as they do to face stimuli.

    “Egner et al. (2010) show that neurons in the fusiform face area (FFA) respond every bit as strongly to non-face (in this experiment, house) stimuli under high expectation of faces as they do to face-stimuli.”

    From Whatever next? Predictive brains, situated agents, and the future of cognitive science (2013) · cites this paper as Egner et al. 2010

    The Results (fMRI data) report that FFA responses to faces and houses were statistically indistinguishable under high face expectation, and the Discussion describes identical FFA population responses in that condition. The study measured fMRI BOLD activity, not responses of individual neurons, so the claim's wording overstates what was observed. (LLM, conf=0.86)

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Authors
Egner, T., Monti, J. M., & Summerfield, C.
Affiliations
  • Duke University (US)
  • University of Illinois Urbana-Champaign (US)
  • University of Oxford (GB)
Venue
The Journal of Neuroscience
Published
2010-12-08
Volume
30
Issue
49
Pages
16601-16608
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2134178808
Cited by
350
References
37
Citations by year
2026: 12 · 2025: 16 · 2024: 25 · 2023: 34 · 2022: 21 · 2021: 19 · 2020: 22 · 2019: 25 · 2018: 23 · 2017: 23 · 2016: 31 · 2015: 23 · 2014: 21 · 2013: 19 · 2012: 22
FWCI
10.46
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
Funders
  • Northwestern University
  • Wellcome Trust (092646)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Face Recognition and Perception
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
Keywords
predictive coding, fusiform face area, ventral stream, neural population responses, prediction error, perceptual expectations, face perception
MeSH terms
Adult, Analysis of Variance, Brain Mapping, Computer Simulation, Female, Humans, Image Processing, Computer-Assisted, Magnetic Resonance Imaging, Male, Models, Neurological, Oxygen, Photic Stimulation, Predictive Value of Tests, Reaction Time, Sensory Receptor Cells, Visual Cortex, Visual Pathways, Visual Perception, Signal Detection, Psychological, Young Adult

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