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The arrow-of-time in neuroimaging time series identifies causal triggers of brain function

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Sweet sixteen for ANLS

Pierre Magistretti, Luc Pellerin

Since its introduction 16 years ago, the astrocyte-neuron lactate shuttle (ANLS) model has profoundly modified our understanding of neuroenergetics by bringing a cellular and molecular resolution. Praised or disputed, the concept has never ceased to attrac ...

2012

Modeling dominance effects on nonverbal behaviors using granger causality

Daniel Gatica-Perez, Oya Aran, Dinesh Babu Jayagopi

In this paper we modeled the effects that dominant people might induce on the nonverbal behavior (speech energy and body motion) of the other meeting participants using Granger causality technique. Our initial hypothesis that more dominant people have gene ...

2012

The neuroimaging community heavily relies on statistical inference to explain measured brain activity given the experimental paradigm. Undeniably, this method has led to many results, but it is limited by the richness of the generative models that are depl ...

Elsevier2012

Multisensory experiences influence subsequent memory performance and brain responses. Studies have thus far concentrated on semantically congruent pairings, leaving unresolved the influence of stimulus pairing and memory sub-types. Here, we paired images w ...

Elsevier2012

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The BOLD contrast is widely used to study brain function. Under externally-applied stimuli, positive BOLD responses (PBR) are generally attributed to local increases in brain activity. Negative BOLD responses (NBR) are also frequently observed, but their u ...

2012

Bridging the Past, Present and Future: Modeling Scene Activities From Event Relationships and Global Rules

Jean-Marc Odobez, Rémi Emonet, Jagannadan Varadarajan

This paper addresses the discovery of activities and learns the underlying processes that govern their occurrences over time in complex surveillance scenes. To this end, we propose a novel topic model that accounts for the two main factors that affect thes ...

2012

Modelling human perception of static facial expressions

Michel Bierlaire, Jean-Philippe Thiran, Matteo Sorci, Gianluca Antonini, Javier Cruz Mota, Thomas Robin

A recent internet based survey of over 35'000 samples has shown that when different human observers are asked to assign labels to static human facial expressions, different individuals categorize differently the same image. This fact results in a lack of a ...

2010

Farmers in developing countries will in the future be confronted with major changes. The ability to cope with these challenges rests on their capability to relate future problems to current behavior. Our approach investigates this capability and consists i ...

2010

Rehabilitating patients with left spatial neglect by prism exposure during a visuomotor activity

Roberta Ronchi, Giuseppe Vallar

OBJECTIVE: Adaptation to prisms displacing the visual scene rightward is a therapeutic tool for left unilateral spatial neglect (USN). We aimed at comparing the effects of the classic adaptation procedure (repeated pointing toward visual targets, control t ...

2010

Our results lend support to the Porter Hypothesis and provide a clue to the underlying mechanism. We try to get at the causal effect of energy prices on TFP using a set of observations made annually on a large number of manufacturing industries located in ...

Créa/UNIL2009