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Pattern classification precedes region-average hemodynamic response in early visual cortex
2013
NeuroImage
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In primary visual cortex (V1) stimulus information can be detected in the pattern of voxel responses more than a second before the average hemodynamic response of V1 deviates from baseline, and classification ...
the average response across a given brain region. ...
Conflict of interest The authors declare that the research was conducted in the absence of any actual or potential conflict of interest including any financial, personal or other relationships with other ...
doi:10.1016/j.neuroimage.2013.04.019
pmid:23587693
fatcat:ooj6ghz2ibgzpdbdtopz24yssu
Auditory Cortex Encodes the Perceptual Interpretation of Ambiguous Sound
2011
Journal of Neuroscience
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in the superior temporal cortex, most prominently on the posterior bank of the left Heschl's gyrus and sulcus and in the adjoining left planum temporale. ...
To overcome this problem, we used functional magnetic resonance imaging (fMRI) in humans and pattern-recognition analysis to identify activation patterns that encode the perceptual interpretation of physically ...
In all GLMs, predictor time courses were convolved with a hemodynamic response function (where both the BOLD response and undershoot are modeled by a gamma function) to adjust for the hemodynamic delay ...
doi:10.1523/jneurosci.4572-10.2011
pmid:21289180
pmcid:PMC6623724
fatcat:cajdvphy6fb7rmewpur7vpvr2q
Decoding Working Memory of Stimulus Contrast in Early Visual Cortex
2013
Journal of Neuroscience
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Furthermore, classification generalized from perceived to remembered stimuli and vice versa, implying that the corresponding pattern of responses in early visual cortex were highly consistent. ...
Recent evidence from electrophysiology and neuroimaging studies, however, suggests that early visual cortex may also play a role in retaining stimulus representations in memory for short periods. ...
role of early visual cortex in working memory. ...
doi:10.1523/jneurosci.3754-12.2013
pmid:23785144
pmcid:PMC3722490
fatcat:evztkozjy5fzjnfcwfgvdma6ky
Less Is More: Expectation Sharpens Representations in the Primary Visual Cortex
2012
Neuron
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We find that while perceptual expectation reduces the neural response amplitude in the primary visual cortex (V1), it improves the stimulus representation in this area, as revealed by MVPA. ...
visual cortex of human volunteers. ...
Third, binning trials on the basis of angle differences revealed no differences in MVPA orientation classification in any of the early visual cortex regions for ''large orientation difference versus small ...
doi:10.1016/j.neuron.2012.04.034
pmid:22841311
fatcat:yhgk4vqqt5bfxix46h7cpaao6a
Sight and Sound Converge to Form Modality-Invariant Representations in Temporoparietal Cortex
2012
Journal of Neuroscience
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While several areas became activated in response to both auditory and visual stimulation, only the neural patterns recorded in a region around the posterior part of the superior temporal sulcus displayed ...
In this functional magnetic resonance imaging study of human subjects, we first identified brain areas that responded to both visual and auditory stimuli and then used crossmodal multivariate pattern analysis ...
Successful classification of the response patterns was taken to infer content specificity. ...
doi:10.1523/jneurosci.2342-12.2012
pmid:23175818
pmcid:PMC3667662
fatcat:ia7lv57yvndvna5gfirq7jh57e
Discriminability of numerosity-evoked fMRI activity patterns in human intra-parietal cortex reflects behavioral numerical acuity
2018
Cortex
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Sample numerosities were decodable in both early visual and intra-parietal cortex with approximately equal accuracy on average. ...
fraction measured prior to scanning showed greater discriminability of fMRI activity patterns in intraparietal cortex, and more specifically, the right LIP region). ...
The detailed pattern of classification performance is displayed in Figure 2A Across all pairwise comparisons, decoding performance was on average 57.1% correct in early visual cortex and 56.7 % correct ...
doi:10.1016/j.cortex.2018.03.008
pmid:29655488
fatcat:3doxinw5dnamhcxnotrpv2zfbe
Discriminability of numerosity-evoked fMRI activity patterns in human intra-parietal cortex reflects behavioral numerical acuity
[article]
2017
bioRxiv
pre-print
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Sample numerosities were decodable in both early visual and intraparietal cortex with approximately equal accuracy on average. ...
fraction measured prior to scanning showed greater discriminability of fMRI activity patterns in intraparietal cortex, and more specifically, the right LIP region). ...
The detailed pattern of classification performance is displayed in Figure 2A Across all pairwise comparisons, decoding performance was on average 57.1% correct in early visual cortex and 56.7 % correct ...
doi:10.1101/198002
fatcat:6qzdecpseng4bns463mvcrvyfe
Linking pattern completion in the hippocampus to predictive coding in visual cortex
2016
Nature Neuroscience
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We show that such memory-based expectations in human visual cortex are related to the hippocampal mechanism of pattern completion. At least two kinds of expectations guide perception. ...
Hierarchical models of predictive coding explain how such expectations arise, with feedback signals carrying information about expected levels of activity in earlier layers of visual cortex 1-3 . ...
representations in early visual cortex. ...
doi:10.1038/nn.4284
pmid:27065363
pmcid:PMC4948994
fatcat:7wupipa555gblfa7dg7h3vlovq
Neural correlates of own- and other-race face perception: Spatial and temporal response differences
2011
NeuroImage
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The pattern-classification results indicate the early availability of categorical information about own-versus other-race face status in the spatial pattern of neural activity. ...
A pattern classifier, applied to voxels across a broad range of ventral temporal areas, discriminated the brain activity maps elicited in response to Asian versus Caucasian faces in the brains of both ...
The time sensitivity of neural discrimination suggests that the pattern of brain regions activated in response to own-and other-race faces differs most in early processing. ...
doi:10.1016/j.neuroimage.2010.10.006
pmid:20937393
fatcat:o6ts37rtsbezfn2pul24jcx6vm
Age differences in neural distinctiveness revealed by multi-voxel pattern analysis
2011
NeuroImage
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Finally, we investigated whether older adults can compensate for altered processing in visual cortex by encoding stimulus information across larger numbers of voxels within the visual cortex or in regions ...
Further, we report that age differences in neural distinctiveness extend beyond the ventral visual cortex: older adults also showed decreased distinctiveness in early visual cortex, inferior parietal cortex ...
early visual cortex in aging humans. ...
doi:10.1016/j.neuroimage.2010.04.267
pmid:20451629
pmcid:PMC2962693
fatcat:skxdgqjd6vhelbhjyttixociia
Spatially Invariant Coding of Numerical Information in Functionally Defined Subregions of Human Parietal Cortex
2013
Cerebral Cortex
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hemifields in parietal, but not early visual cortex. ...
In a delayed number comparison paradigm with laterally presented numerosities, parietal cortex discriminated between numerosities better than early visual cortex, and discrimination generalized across ...
Figure 2A shows classification performance for early visual cortex (left) and parietal cortex (right), where classification performance appears to be better on average when training and testing in the ...
doi:10.1093/cercor/bht323
pmid:24293562
fatcat:fpulmwwp25c2te3ii2tfbxryke
Reading-induced shifts of perceptual speech representations in auditory cortex
2017
Scientific Reports
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We show that it is possible to retrieve the text-induced perceptual interpretation from fMRI activity patterns in the posterior superior temporal cortex. ...
In this paradigm, the pairing of visual text and ambiguous speech sounds shifts (i.e. recalibrates) the perceptual interpretation of the ambiguous sounds in subsequent auditory-only trials. ...
We thank Miriam Löhr and Selma Kemmerer for assistance in data acquisition and Giancarlo Valente for advice on statistical analysis of the behavioural data. ...
doi:10.1038/s41598-017-05356-3
pmid:28698606
pmcid:PMC5506038
fatcat:at7q4elowveupjxuvtutbpgqpu
Decoding the future from past experience: learning shapes predictions in early visual cortex
2015
Journal of Neurophysiology
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Decoding the future from past experience: learning shapes predictions in early visual cortex. ...
responses in early visual areas (Kamitani and Tong 2005) . ...
and Albright 2007) and early visual (Bosch et al. 2014) cortex. ...
doi:10.1152/jn.00753.2014
pmid:25744884
pmcid:PMC4432681
fatcat:p5rr7gdiwvgu5b2ec3fwjjmz5y
Fine-scale activity patterns in high-level visual areas encode the category of invisible objects
2008
Journal of Vision
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Overall responses of high-level ventral visual areas to two different types of invisible object stimuli (faces and houses) were very weak and did not differ in amplitude. ...
These findings demonstrate the presence of category-specific information in high-level visual areas during profound interocular suppression of object stimuli that can only be retrieved when the fine-scale ...
It should be noted that our experimental paradigm and scanning procedure was not originally designed to assess response patterns in early visual cortex and we cannot therefore attribute the patterns to ...
doi:10.1167/8.15.10
pmid:19146294
fatcat:3gfvv6z3wvhl3fhzupgebikzwa
Reward processing in the value-driven attention network: reward signals tracking cue identity and location
2016
Social Cognitive and Affective Neuroscience
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preceding cue in IPS, while early visual cortex represented both location and identity. ...
tail, lateral occipital complex (LOC) and early visual cortex] and intraparietal sulcus (IPS). ...
The funder played no role in the reported research beyond financial support. Conflict of interest. None declared. ...
doi:10.1093/scan/nsw141
pmid:27677944
pmcid:PMC5390735
fatcat:4dmz5aibnngexciiln7sahk2fm
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