Modulation of visual cortical excitability by working memory

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Cattaneo, Zaira Pisoni, Alberto Papagno, Costanza Silvanto, Juha 2017-05-11T08:30:41Z 2017-05-11T08:30:41Z 2011
dc.identifier.citation Cattaneo , Z , Pisoni , A , Papagno , C & Silvanto , J 2011 , ' Modulation of visual cortical excitability by working memory : Effect of luminance contrast of mental imagery ' Frontiers in Psychology , vol 2 , 29 , pp. 1-9 . DOI: 10.3389/fpsyg.2011.00029 en
dc.identifier.issn 1664-1078
dc.identifier.other PURE UUID: 7e00cb84-2cc7-46c4-8cb6-42dfd1fc5ba9
dc.identifier.other PURE ITEMURL:
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dc.description.abstract Although much is known about the impact of stimulus properties such as luminance contrast, spatial frequency, and orientation on visually evoked neural activity, much less is known about how they modulate neural activity when they are properties of a mental image held in working memory (WM). Here we addressed this question by investigating how a parametric manipulation of an imagined stimulus attribute affects neuronal excitability in the early visual cortex. We manipulated luminance contrast, a stimulus property known to strongly affect the magnitude of neuronal responses in early visual areas. Luminance contrast modulated neuronal excitability, as assessed by the frequency of phosphenes induced by transcranial magnetic stimulation (TMS) with the exact nature of this modulation depending on TMS intensity. These results point to a strong overlap in the neuronal processes underlying visual perception and mental imagery: not only does WM maintenance selectively engage neurons which are tuned to the maintained attribute (as has previously been shown), but the extent to which those neurons are activated depends on the image contrast (as is the case with visually evoked responses). From a methodological viewpoint, these results suggest that assessment of visual cortical excitability using TMS is affected by the TMS intensity used to probe the neuronal population. en
dc.format.extent 1-9
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Frontiers in Psychology en
dc.relation.ispartofseries Volume 2 en
dc.rights openAccess en
dc.subject.other Psychology(all) en
dc.title Modulation of visual cortical excitability by working memory en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department University of Milan - Bicocca
dc.contributor.department O.V.Lounasmaa-laboratorio
dc.contributor.department Department of Neuroscience and Biomedical Engineering en
dc.subject.keyword Excitability
dc.subject.keyword Noise
dc.subject.keyword Phosphenes
dc.subject.keyword Stochastic resonance
dc.subject.keyword Visuo-spatial working memory
dc.subject.keyword Psychology(all)
dc.identifier.urn URN:NBN:fi:aalto-201705114024
dc.identifier.doi 10.3389/fpsyg.2011.00029
dc.type.version publishedVersion

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