Héctor Ortiz

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The present investigation was devoted to unraveling the time-course and brain regions involved in speech segmentation, which is one of the first processes necessary for learning a new language in adults and infants. A specific brain electrical pattern resembling the N400 language component was identified as an indicator of speech segmentation of candidate(More)
The notion of a "default mode of brain function" has taken on certain relevance in human neuroimaging studies and in relation to a network of lateral parietal and midline cortical regions that show prominent activity fluctuations during passive imaging states, such as rest. In this study, we perform three fMRI experiments that demonstrate consistency and(More)
CONTEXT Neurobiological models of obsessive-compulsive disorder (OCD) emphasize disturbances in the function and connectivity of brain corticostriatal networks, or "loops." Although neuroimaging studies of patients have supported this network model of OCD, very few have applied measurements that are sensitive to brain connectivity features. OBJECTIVE(More)
BACKGROUND The aim of this study was to compare the results of stapled haemorrhoidopexy (commonly called stapled haemorrhoidectomy) with those of conventional diathermy haemorrhoidectomy. METHODS Fifty-five patients with symptomatic third- and fourth-degree haemorrhoids were randomized to either stapled haemorrhoidopexy (n = 27) or conventional diathermy(More)
BACKGROUND There is growing interest in the nature of slow variations of the blood oxygen level-dependent (BOLD) signal observed in functional MRI resting-state studies. In humans, these slow BOLD variations are thought to reflect an underlying or intrinsic form of brain functional connectivity in discrete neuroanatomical systems. While these 'resting-state(More)
PURPOSE The aim of this prospective study was to compare the results of stapled hemorrhoidopexy with those of conventional diathermy excision for controlling symptoms in patients with fourth-degree hemorrhoids. METHODS Thirty-one patients with symptomatic, prolapsed irreducible piles were randomized to either stapled hemorrhoidopexy (n = 15) or diathermy(More)
BACKGROUND Care for patients with colon and rectal cancer has improved in the last 20years; however considerable variation still exists in cancer management and outcome between European countries. Large variation is also apparent between national guidelines and patterns of cancer care in Europe. Therefore, EURECCA, which is the acronym of European(More)
BACKGROUND Whole-brain imaging approaches may contribute to the characterization of neuroanatomic alterations in major depression, especially in clinically homogenous patient groups such as those with melancholic features. We assessed brain anatomic alterations, both cross-sectionally and longitudinally, in patients with melancholic depression using a(More)
BACKGROUND The aim of this randomized study was to compare the results of anal fistula plug and endorectal advancement flap in the treatment of high fistula in ano of cryptoglandular origin. METHODS Consecutive patients with high trans-sphincteric fistula in ano of cryptoglandular aetiology were randomized to treatment with either an anal fistula plug or(More)
BACKGROUND Nociceptive stimuli may evoke brain responses longer than the stimulus duration often partially detected by conventional neuroimaging. Fibromyalgia patients typically complain of severe pain from gentle stimuli. We aimed to characterize brain response to painful pressure in fibromyalgia patients by generating activation maps adjusted for the(More)