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Université de Fribourg

Noise in brain activity engenders perception and influences discrimination sensitivity

Bernasconi, Fosco ; De Lucia, Marzia ; Tzovara, Athina ; Manuel, Aurelie L. ; Murray, Micah M. ; Spierer, Lucas

In: The Journal of Neuroscience, 2011, vol. 31, no. 49, p. 17971-17981

Behavioral and brain responses to identical stimuli can vary with experimental and task parameters, including the context of stimulus presentation or attention. More surprisingly, computational models suggest that noise-related random fluctuations in brain responses to stimuli would alone be sufficient to engender perceptual differences between physically identical stimuli. In two experiments...

Université de Fribourg

Balanced bilinguals favor lexical processing in their opaque language and conversion system in their shallow language

Buetler, Karin A. ; Rodríguez, Diego de León ; Laganaro, Marina ; Müri, René ; Nyffeler, Thomas ; Spierer, Lucas ; Annoni, Jean-Marie

In: Brain and Language, 2015, vol. 150, p. 166–176

Referred to as orthographic depth, the degree of consistency of grapheme/phoneme correspondences varies across languages from high in shallow orthographies to low in deep orthographies. The present study investigates the impact of orthographic depth on reading route by analyzing evoked potentials to words in a deep (French) and shallow (German) language presented to highly proficient bilinguals....

Université de Fribourg

Language context modulates reading route: an electrical neuroimaging study

Buetler, Karin A. ; Rodríguez, Diego de León ; Laganaro, Marina ; Müri, René ; Spierer, Lucas ; Annoni, Jean-Marie

In: Frontiers in Human Neuroscience, 2014, vol. 8, p. article 83

Introduction: The orthographic depth hypothesis (Katz and Feldman, 1983) posits that different reading routes are engaged depending on the type of grapheme/phoneme correspondence of the language being read. Shallow orthographies with consistent grapheme/phoneme correspondences favor encoding via non-lexical pathways, where each grapheme is sequentially mapped to its corresponding phoneme. In...

Université de Fribourg

Sustained enhancements in inhibitory control depend primarily on the reinforcement of fronto-basal anatomical connectivity

Chavan, Camille ; Mouthon, Michael ; Simone, Marie ; Hoogewoud, tHenri-Marcel ; Draganski, Bogdan ; Zwaag, Wietske van der ; Spierer, Lucas

In: Brain Structure and Function, 2017, vol. 222, no. 1, p. 635–643

What are the neurophysiological determinants of sustained supra-normal inhibitory control performance? We addressed this question by coupling multimodal neuroimaging and behavioral investigations of experts in fencing who underwent more than 20,000 h of inhibitory control training over 15 years. The superior control of the experts manifested behaviorally as a speeding-up of inhibition...

Université de Fribourg

Differential patterns of functional and structural plasticity within and between inferior frontal gyri support training-induced improvements in inhibitory control proficiency

Chavan, Camille F. ; Mouthon, Michael ; Draganski, Bogdan ; Zwaag, Wietske van der ; Spierer, Lucas

In: Human Brain Mapping, 2015, vol. 36, no. 7, p. 2527–2543

Ample evidence indicates that inhibitory control (IC), a key executive component referring to the ability to suppress cognitive or motor processes, relies on a right-lateralized fronto-basal brain network. However, whether and how IC can be improved with training and the underlying neuroplastic mechanisms remains largely unresolved. We used functional and structural magnetic resonance imaging to...

Université de Fribourg

Partly segregated cortico-subcortical pathways support phonologic and semantic verbal fluency: A lesion study

Chouiter, Leila ; Holmberg, Josefina ; Manuel, Aurelie L. ; Colombo, Françoise ; Clarke, Stephanie ; Annoni, Jean-Marie ; Spierer, Lucas

In: Neuroscience, 2016, vol. 329, p. 275–283

Verbal fluency refers to the ability to generate as many words as possible in a limited time interval, without repetition and according to either a phonologic (each word begins with a given letter) or a semantic rule (each word belongs to a given semantic category). While current literature suggests the involvement of left fronto-temporal structures in fluency tasks, whether the same or...

Université de Fribourg

Experience-based auditory predictions modulate brain activity to silence as do real sounds

Chouiter, Leila ; Tzovara, Athina ; Dieguez, Sebastian ; Annoni, Jean-Marie ; Magezi, David ; De Lucia, Marzia ; Spierer, Lucas

In: Journal of Cognitive Neuroscience, 2015, vol. 27, no. 10, p. 1968–1980

Interactions between stimuli's acoustic features and experience-based internal models of the environment enable listeners to compensate for the disruptions in auditory streams that are regularly encountered in noisy environments. However, whether auditory gaps are filled in predictively or restored a posteriori remains unclear. The current lack of positive statistical evidence that internal...

Université de Fribourg

High and low stimulus-driven conflict engage segregated brain networks, not quantitatively different resources

Chouiter, Leila ; Dieguez, Sebastian ; Annoni, Jean-Marie ; Spierer, Lucas

In: Brain Topography, 2014, vol. 27, no. 2, p. 279–292

Task-irrelevant information is constantly present in our environment and may interfere with the processing of the information necessary to achieve goal-directed behavior. While task goals determine which information must be suppressed, the demand for inhibitory control depends on the strength of the interference induced by incoming, task-irrelevant information. Whether the same or distinct...

Université de Fribourg

Enhancing frontal top-down inhibitory control with Go/NoGo training

Hartmann, Lea ; Sallard, Eienne ; Spierer, Lucas

In: Brain Structure and Function, 2016, vol. 221, no. 7, p. 3835–3842

Whether and how the capacity to inhibit cognitive and motor processes can be trained and the underlying neuroplastic mechanisms remain unclear. Using electrical neuroimaging methods, we investigated how inhibitory control training regimens can be designed to enhance frontal top-down inhibition processes. We trained participants with a Go/NoGo task in which the stimulus–response mapping...