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• W2020642807 abstract "Abstract Attention affects neuronal processing and improves behavioural performance. In extrastriate visual cortex these effects have been explained by normalization models, which assume that attention influences the circuit that mediates surround suppression. While normalization models have been able to explain attentional effects, their validity has rarely been tested against alternative models. Here we investigate how attention and surround/mask stimuli affect neuronal firing rates and orientation tuning in macaque V1. Surround/mask stimuli provide an estimate to what extent V1 neurons are affected by normalization, which was compared against effects of spatial top down attention. For some attention/surround effect comparisons, the strength of attentional modulation was correlated with the strength of surround modulation, suggesting that attention and surround/mask stimulation (i.e. normalization) might use a common mechanism. To explore this in detail, we fitted multiplicative and additive models of attention to our data. In one class of models, attention contributed to normalization mechanisms, whereas in a different class of models it did not. Model selection based on Akaike's and on Bayesian information criteria demonstrated that in most cells the effects of attention were best described by models where attention did not contribute to normalization mechanisms. This demonstrates that attentional influences on neuronal responses in primary visual cortex often bypass normalization mechanisms." @default.
• W2020642807 created "2016-06-24" @default.
• W2020642807 creator A5025474331 @default.
• W2020642807 creator A5039673234 @default.
• W2020642807 creator A5050754541 @default.
• W2020642807 creator A5072951043 @default.
• W2020642807 date "2015-03-11" @default.
• W2020642807 modified "2023-10-04" @default.
• W2020642807 title "Attention and normalization circuits in macaque V1" @default.
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• W2020642807 doi "https://doi.org/10.1111/ejn.12857" @default.
• W2020642807 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4402004" @default.
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