Project acronym LIGHTUP
Project Turning the cortically blind brain to see: from neural computations to system dynamicsgenerating visual awareness in humans and monkeys
Researcher (PI) Marco TAMIETTO
Host Institution (HI) UNIVERSITA DEGLI STUDI DI TORINO
Call Details Consolidator Grant (CoG), SH4, ERC-2017-COG
Summary Visual awareness affords flexibility and experiential richness, and its loss following brain damage has devastating effects. However, patients with blindness following cortical damage may retain visual functions, despite visual awareness is lacking (blindsight). But, how can we translate non-conscious visual abilities into conscious ones after damage to the visual cortex? To place our understanding of visual awareness on firm neurobiological and mechanistic bases, I propose to integrate human and monkey neuroscience. Next, I will translate this wisdom into evidence-based clinical intervention. First, LIGHTUP will apply computational neuroimaging methods at the micro-scale level, estimating population receptive fields in humans and monkeys. This will enable analyzing fMRI signal similar to the way tuning properties are studied in neurophysiology, and to clarify how brain areas translate visual properties into responses associated with awareness. Second, LIGHTUP leverages a behavioural paradigm that can dissociate nonconscious visual abilities from awareness in monkeys, thus offering a refined animal model of visual awareness. Applying behavioural-Dynamic Causal Modelling to combine fMRI and behavioral data, LIGHTUP will build up a Bayesian framework that specifies the directionality of information flow in the interactions across distant brain areas, and their causal role in generating visual awareness. In the third part, I will devise a rehabilitation protocol that combines brain stimulation and visual training to promote the (re)emergence of lost visual awareness. LIGHTUP will exploit non-invasive transcranial magnetic stimulation (TMS) in a novel protocol that enables stimulation of complex cortical circuits and selection of the direction of connectivity that is enhanced. This associative stimulation has been proven to induce Hebbian plasticity, and we have piloted its effects in fostering visual awareness in association with visual restoration training.
Summary
Visual awareness affords flexibility and experiential richness, and its loss following brain damage has devastating effects. However, patients with blindness following cortical damage may retain visual functions, despite visual awareness is lacking (blindsight). But, how can we translate non-conscious visual abilities into conscious ones after damage to the visual cortex? To place our understanding of visual awareness on firm neurobiological and mechanistic bases, I propose to integrate human and monkey neuroscience. Next, I will translate this wisdom into evidence-based clinical intervention. First, LIGHTUP will apply computational neuroimaging methods at the micro-scale level, estimating population receptive fields in humans and monkeys. This will enable analyzing fMRI signal similar to the way tuning properties are studied in neurophysiology, and to clarify how brain areas translate visual properties into responses associated with awareness. Second, LIGHTUP leverages a behavioural paradigm that can dissociate nonconscious visual abilities from awareness in monkeys, thus offering a refined animal model of visual awareness. Applying behavioural-Dynamic Causal Modelling to combine fMRI and behavioral data, LIGHTUP will build up a Bayesian framework that specifies the directionality of information flow in the interactions across distant brain areas, and their causal role in generating visual awareness. In the third part, I will devise a rehabilitation protocol that combines brain stimulation and visual training to promote the (re)emergence of lost visual awareness. LIGHTUP will exploit non-invasive transcranial magnetic stimulation (TMS) in a novel protocol that enables stimulation of complex cortical circuits and selection of the direction of connectivity that is enhanced. This associative stimulation has been proven to induce Hebbian plasticity, and we have piloted its effects in fostering visual awareness in association with visual restoration training.
Max ERC Funding
1 994 212 €
Duration
Start date: 2018-08-01, End date: 2023-07-31
Project acronym Set-to-change
Project Set to change: early life factors restricting and promoting neurocognitive plasticity through life
Researcher (PI) Kristine WALHOVD
Host Institution (HI) UNIVERSITETET I OSLO
Call Details Consolidator Grant (CoG), SH4, ERC-2017-COG
Summary Cognitive function in old age can be predicted from how you functioned when you were young. This is remarkable, as there are substantial cognitive age changes. Are we neurodevelopmentally set to change through life in certain ways? The objective of Set-to-change is to test whether and how early life environmental factors and genetic makeup interact to regulate neurocognitive plasticity through the lifespan. Neurocognitive plasticity; i.e. changes in brain and cognition in response to environmental demands over time, shows huge individual variability, for unknown reasons. Neurodevelopmental origins of functional variation through the lifespan are acknowledged, but the pathways need to be identified. As individual constitution and environment are intrinsically correlated, to make progress beyond state of the art, this can only be tested in an experimental setting.
The novelty and ground-breaking nature of the project lies in the synthesis of a targeted experimental approach testing differences in neurocognitive plasticity by training of younger and older adult mono- (MZ) and dizygotic twins (total n = 400 individuals), with varying degrees of prenatal environmental variance, as indexed by their extent of discordance in birth weight (BW). BW discordance in MZ twins enables me to disentangle early environmental and genetic influences on neurocognitive plasticity. I will employ a novel ecologically valid memory intervention utilizing navigation with true locomotion and prospective memory in virtual reality. Twins will be assessed with brain MRI, cognitive, health and epigenetic measures at multiple time points spread across 2.5 years pre- and post- 3 months intervention in a AB/BA crossover design, to investigate neurocognitive plasticity and age change longitudinally, as well as possible lifestyle and epigenetic mediators. I hypothesize that early life environmental influences will interact with genetic makeup in determining neurocognitive plasticity in adulthood.
Summary
Cognitive function in old age can be predicted from how you functioned when you were young. This is remarkable, as there are substantial cognitive age changes. Are we neurodevelopmentally set to change through life in certain ways? The objective of Set-to-change is to test whether and how early life environmental factors and genetic makeup interact to regulate neurocognitive plasticity through the lifespan. Neurocognitive plasticity; i.e. changes in brain and cognition in response to environmental demands over time, shows huge individual variability, for unknown reasons. Neurodevelopmental origins of functional variation through the lifespan are acknowledged, but the pathways need to be identified. As individual constitution and environment are intrinsically correlated, to make progress beyond state of the art, this can only be tested in an experimental setting.
The novelty and ground-breaking nature of the project lies in the synthesis of a targeted experimental approach testing differences in neurocognitive plasticity by training of younger and older adult mono- (MZ) and dizygotic twins (total n = 400 individuals), with varying degrees of prenatal environmental variance, as indexed by their extent of discordance in birth weight (BW). BW discordance in MZ twins enables me to disentangle early environmental and genetic influences on neurocognitive plasticity. I will employ a novel ecologically valid memory intervention utilizing navigation with true locomotion and prospective memory in virtual reality. Twins will be assessed with brain MRI, cognitive, health and epigenetic measures at multiple time points spread across 2.5 years pre- and post- 3 months intervention in a AB/BA crossover design, to investigate neurocognitive plasticity and age change longitudinally, as well as possible lifestyle and epigenetic mediators. I hypothesize that early life environmental influences will interact with genetic makeup in determining neurocognitive plasticity in adulthood.
Max ERC Funding
1 999 997 €
Duration
Start date: 2018-10-01, End date: 2023-09-30
