Alexis Pérez-Bellido

Alexis Pérez-Bellido
Radboud University | RU · DCCN

Ph.D

About

22
Publications
2,645
Reads
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224
Citations
Additional affiliations
February 2009 - July 2014
University of Barcelona
Position
  • PhD Student

Publications

Publications (22)
Article
Full-text available
Recent studies have proposed that some cross-modal illusions might be expressed in what were previously thought of as sensory-specific brain areas. Therefore, one interesting question is whether auditory-driven visual illusory percepts respond to manipulations of low-level visual attributes (such as luminance or chromatic contrast) in the same way...
Article
Full-text available
Cross-modal enhancement can be mediated both by higher-order effects due to attention and decision making, as well as by detection level stimulus-driven interactions. However, the contribution of each of these sources to behavioural improvements has not been conclusively determined and quantified separately. Here, we apply psychophysical analysis b...
Article
Full-text available
The mechanisms responsible for the integration of sensory information from different modalities have become a topic of intense interest in psychophysics and neuroscience. Many authors now claim that early, sensory-based cross-modal convergence improves performance in detection tasks. An important strand of supporting evidence for this claim is base...
Article
Crossmodal interaction conferring enhancement in sensory processing is nowadays widely accepted. Such benefit is often exemplified by neural response amplification reported in physiological studies conducted with animals, which parallel behavioural demonstrations of sound-driven improvement in visual tasks in humans. Yet, a good deal of controversy...
Article
Developmental dyslexia affects 5%-10% of the population [1], resulting in poor spelling and reading skills. While there are well-documented differences in the way dyslexics process low-level visual [2, 3] and auditory [4, 5] stimuli, it is mostly unknown whether there are similar differences in audiovisual multisensory processes. Here, we investiga...
Preprint
Sounds enhance the detection of visual stimuli while concurrently biasing observers decisions. To investigate the neural mechanisms that underly such multisensory interactions, we decoded time-resolved signal detection theory (SDT) sensitivity and criterion parameters from magnetoencephalography activity while participants performed a visual detect...
Article
Full-text available
A set of recent neuroimaging studies observed that the perception of an illusory shape can elicit both positive and negative feedback modulations in different parts of the early visual cortex. When three Pac-Men shapes were aligned in such a way that they created an illusory triangle (i.e., the Kanizsa illusion), neural activity in early visual cor...
Article
Perceptual expectations can change how a visual stimulus is perceived. Recent studies have shown mixed results in terms of whether expectations modulate sensory representations. Here, we used a statistical learning paradigm to study the temporal characteristics of perceptual expectations. We presented participants with pairs of object images organi...
Article
Full-text available
The spatial context in which we view a visual stimulus strongly determines how we perceive the stimulus. In the visual tilt illusion, the perceived orientation of a visual grating is affected by the orientation signals in its surrounding context. Conceivably, the spatial context in which a visual grating is perceived can be defined by interactive m...
Data
Supplemental Information: Rapid recalibration of speech perception after experiencing the McGurk illusion
Article
Full-text available
The human brain can quickly adapt to changes in the environment. One example is phonetic recalibration: a speech sound is interpreted differently depending on the visual speech and this interpretation persists in the absence of visual information. Here, we examined the mechanisms of phonetic recalibration. Participants categorized the auditory syll...
Article
Full-text available
Recent studies have challenged the traditional notion of modality-dedicated cortical systems by showing that audition and touch evoke responses in the same sensory brain regions. While much of this work has focused on somatosensory responses in auditory regions, fewer studies have investigated sound responses and representations in somatosensory re...
Article
Full-text available
Our ability to process temporal frequency information by touch underlies our capacity to perceive and discriminate surface textures. Auditory signals, which also provide extensive temporal frequency information, can systematically alter the perception of vibrations on the hand. How auditory signals shape tactile processing is unclear: perceptual in...
Poster
Full-text available
We perceive temporal frequency information by audition and touch. Auditory (A) and tactile (T) temporal frequency perception is closely linked and spatially overlapping regions of sensory cortex respond to auditory and tactile stimulation. This may reflect common auditory and tactile frequency representations that are supported by shared neural cir...
Article
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Article
The level of processing at which different modalities interact to either facilitate or interfere with detection has been a matter of debate for more than half a century. This question has been mainly addressed by means of statistical models (Green, 1958), or by biologically plausible models (Schnupp et al., 2005). One of the most widely accepted st...
Article
Prior knowledge about the spatial frequency (SF) of upcoming visual targets (Gabor patches) speeds up average reaction times and decreases standard deviation. This has often been regarded as evidence for a multichannel processing of SF in vision. Multisensory research, on the other hand, has often reported the existence of sensory interactions betw...
Article
Full-text available
Unveiling the mechanisms that integrate sensory information from different modalities has become a main aim of psychological research in the last decade. In this project we are interested in the specific case of auditory-tactile interactions in the perception of vibrotactile events, an aspect that has not received as much attention as audio-visual...

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