Francesco Tomaiuolo - Academia.edu (original) (raw)

Papers by Francesco Tomaiuolo

Journal of Neurosurgical Sciences

SSRN Electronic Journal, 2022

First study: bisection of number intervals in right brain damaged patients and healthy elderly pa... more First study: bisection of number intervals in right brain damaged patients and healthy elderly participants. Patients On admission to the rehabilitation hospital, patients were consecutively screened for inclusion in the study. Patients with bilateral strokes or signs of dementia were excluded. Spatial neglect was assessed with a standardized battery [1], visual field with Goldman dynamic perimetry. Age matched healthy participants were free from cognitive or psychiatric disorders and had normal or corrected vision.

Neuropsychologia, 2021

Whether the semantic representation of numbers is endowed with an intrinsic spatial component, so... more Whether the semantic representation of numbers is endowed with an intrinsic spatial component, so that smaller numbers are inherently represented to the left of larger ones on a Mental Number Line (MNL), is a central matter of debate in numerical cognition. To gain an insight into this issue, we investigated the performance of right brain damaged patients with left spatial neglect (N+) in a bimanual Magnitude Comparison SNARC task and in a uni-manual Magnitude Comparison Go/No-Go task (i.e. "is the number smaller or larger than 5?"). While the first task requires the use of contrasting left/right spatial codes for response selection, the second task does not require the use of these codes. In line with previous evidence, in the SNARC task N+ patients displayed a significant asymmetry in Reaction Times (RTs), with slower RTs to number "4", that was immediately precedent to the numerical reference "5", with respect to the number "6", that immediately followed the same reference. This RTs asymmetry was correlated with lesion of white matter tracts, i.e. Fronto-Occipital-Fasciculus, that allows prefrontal Ba 8 and 46 to regulate the distribution of attention on sensory and memory traces in posterior occipital, temporal and parietal areas. In contrast, no similar RTs asymmetry was found in the Go/No-Go task. These findings suggest that while in the SNARC task numbers get mentally organised from left-to-right as a function of their increasing magnitude, so that N+ patients display a delay in the processing of number-magnitudes that are immediately smaller than a given numerical reference, in the Go/No-Go task no left-to-right organization is activated. These results support the idea that it is the use of contrasting left/right spatial codes, whether motor or conceptual, that triggers the generation of a spatially left-to-right organised MNL and that the representation of number magnitude is not endowed with an inherent spatial component.

Brain Communications, 2021

Right brain-damaged patients with unilateral spatial neglect fail to explore the left side of spa... more Right brain-damaged patients with unilateral spatial neglect fail to explore the left side of space. Recent EEG and clinical evidence suggests that neglect patients might suffer deficits in predictive coding, i.e. in identifying and exploiting probabilistic associations among sensory stimuli in the environment. To gain direct insights on this issue, we focussed on the hierarchical components of predictive coding. We recorded EEG responses evoked by central, left-side or right-side tones that were presented at the end of sequences of four central tones. Left-side and right-side deviant tones produce a pre-attentive Mismatch Negativity that reflects a lower-order prediction error for the ‘Local’ deviation of the tone at the end of the sequence. Higher-order prediction errors for the frequency of these deviations in the acoustic environment, i.e. ‘Global’ deviation, are marked by the P3 response. We show that when neglect patients are immersed in an acoustic environment characterized b...

The Journal of Neuroscience, 2019

EEG studies in healthy humans have highlighted that alpha-band activity is relatively reduced ove... more EEG studies in healthy humans have highlighted that alpha-band activity is relatively reduced over the occipital–parietal areas of the hemisphere contralateral to the direction of spatial attention. Here, we investigated the hemispheric distribution of alpha during orienting of attention in male and female right brain-damaged patients with left spatial neglect. Temporal spectral evolution showed that in patients with neglect alpha oscillations over the damaged hemisphere were pathologically enhanced both during the baseline-fixation period that preceded cued orienting (capturing tonic alpha changes) and during orienting with leftward, rightward, or neutral-bilateral spatial cues (reflecting phasic alpha changes). Patients without neglect showed a similar though significantly less enhanced hemispheric asymmetry. Healthy control subjects displayed a conventional decrease of alpha activity over the hemisphere contralateral to the direction of orienting. In right-brain-damaged patients,...

Volumes of the intrasulcal gray matter were measured in three cerebral sulci located on the media... more Volumes of the intrasulcal gray matter were measured in three cerebral sulci located on the medial wall of the human frontal lobe: cingulate sulcus (CS), paracingulate sulcus (PCS), and superior-rostral sulcus (SRS). The measurements were carried out on T1-weighted 3-D high-resolution magnetic-resonance (MR) images acquired in 105 young right-handed volunteers (42 female and 63 male). Before the measurement, the images were transformed into a standardized stereotaxic space (Talairach and Tournoux [1988] Human Brain: 3-Dimensional Proportional System. An Approach to Cerebral Imaging. Stuttgart, New York Georg Thieme Verlag), thus removing inter-individual differences in brain size. The intrasulcal gray matter was segmented in a semi-automatic manner. Significant gender differences were found in the volume of the CS (female> male) and the PCS (male> female). Hemispheric asymmetries were observed between the left and right volumes of the intrasulcal gray matter in the anterior (r...

Brain Sciences

Posterior cerebral artery (PCA) territory infarction involving occipital cortical damage can give... more Posterior cerebral artery (PCA) territory infarction involving occipital cortical damage can give rise to contralateral homonymous hemianopia. Here, we report two rare cases of patients with lesions in the left hemisphere PCA territory who developed right visuo-spatial neglect. One patient suffered right hemianopia and right visuo-spatial neglect after a stroke that damaged the left primary visual cortex and the callosal splenial fibers. The other unique case is of a patient who had a brain tumor in the posterior cerebral region in the left hemisphere and initially exhibited only right hemianopia that developed into right visuo-spatial neglect after tumor resection that included the splenial fibers. These cases indicate that, as in cases with damage in the right PCA territory, lesions in the left PCA yield visuo-spatial neglect when the damage produces contralateral hemianopia and concomitant disconnection of the splenium of the corpus callosum, which interferes with the arrival of ...

Alternative therapies in health and medicine, 2020

Context A reduction in the use of opioids by older adult patients could reduce unpleasant side ef... more Context A reduction in the use of opioids by older adult patients could reduce unpleasant side effects for them. During general anesthesia, binaural beat (BB) listening has been found to reduce intraoperative fentanyl consumption as well as postoperative pain scores and discharge time. Auditory BBs are a perceptual phenomenon occurring when tones of 2 slightly different frequencies are presented simultaneously and separately to each ear. Objective The study intended to evaluate the ability of BBs, as a nonpharmacological premedication, to reduce postoperative morphine consumption in older adults undergoing total knee replacement surgery and to modify the levels of anxiety and feelings of pain that patients experience. Design The research team designed a prospective, single-center, randomized controlled study. Setting The study was conducted in the Orthopedic Department of the Santa Maria Maddalena Hospital (Volterra [Pisa], Italy). Participants Forty older adults at the hospital who...

NeuroImage: Clinical, 2021

Highlights • Congenital (CB) and late blind (LB) affects the integrity brain visual structures.• ... more Highlights • Congenital (CB) and late blind (LB) affects the integrity brain visual structures.• We measured the integrity of the retino-fugal system using structural MRI images.• Optic nerve, optic tract, optic chiasm and LGN were reduced by 50 to 60% in CB and LB.• There were no differences between CB and LB.• In LB, optic nerve volume correlated negatively with blindness duration.

Stereotactic and Functional Neurosurgery, 2016

Background: Intermittent explosive disease (IED) is a psychiatric disorder characterized by inter... more Background: Intermittent explosive disease (IED) is a psychiatric disorder characterized by intermittent attacks of rage and violence frequently resistant to pharmacological therapy. Deep brain stimulation (DBS) of the posteromedial hypothalamus has been applied with fair results and clinical improvement with some surgical morbidity due to neurovegetative side effects. The anterior limb of the internal capsule/ventral capsule/ventral striatum (VC/VS) has never been used alone as a target for this disease. Objectives: The aim of this study is to evaluate the efficacy of bilateral DBS of the VC/VS for the treatment of IED. Methods: We performed bilateral DBS of the VC/VS in a 21-year-old patient with IED. This young man had a traumatic birth complicated by hypoxia, and he showed a mild mental impairment. Different pharmacological treatments were carried out with no results before DBS was proposed to the patient's relatives after multidisciplinary approval. Results: After 22 months...

Journal of the International Neuropsychological Society, 2016

Objectives: Functional magnetic resonance imaging (fMRI) may be adopted as a complementary tool f... more Objectives: Functional magnetic resonance imaging (fMRI) may be adopted as a complementary tool for bedside observation in the disorders of consciousness (DOC). However, the diagnostic value of this technique is still debated because of the lack of accuracy in determining levels of consciousness within a single patient. Recently, Giacino and colleagues (2014) hypothesized that a longitudinal fMRI evaluation may provide a more informative assessment in the detection of residual awareness. The aim of this study was to measure the correspondence between clinically defined level of awareness and neural responses within a single DOC patient. Methods: We used a follow-up fMRI design in combination with a passive speech-processing task. Patient’s consciousness was measured through time by using the Coma Recovery Scale. Results: The patient progressed from a vegetative state (VS) to a minimally conscious state (MCS). Patient’s task-related neural responses mirrored the clinical change from ...

Cortex, 2015

anterior components of the parietal-frontal attentional network and, compared with all other negl... more anterior components of the parietal-frontal attentional network and, compared with all other neglect and non-neglect patients, had additional lesion involvement of the medial anterior cingulate cortex (ACC) and of the adjacent sectors of the corpus callosum. In contrast to his lateralized motivational learning deficit, L.R. had no lateral bias in the early phases of attentional processing as he suffered no contralesional visual or auditory extinction on double simultaneous tachistoscopic and dichotic stimulation and detected, with no exception, single contralesional visual and auditory stimuli. In a separate study, we were able to compare L.R. with another RBD patient, G.P., who had a selective lesion in the right ACC, in the adjacent callosal connections and the medial-basal prefrontal cortex. G.P. had no contralesional neglect and displayed normal reward learning both in the left and right side of space. These findings show that contralesional reward learning is generally preserved in RBD patients with left spatial neglect and that this can be exploited in rehabilitation protocols. Contralesional reward learning is severely disrupted in neglect patients when an additional lesion of the ACC is present: however, as demonstrated by the comparison between L.R. and G.P. cases, selective unilateral lesion of the right ACC does not produce motivational neglect for the contralesional space.

Neurocase, 2004

Functional magnetic resonance imaging and transcranial magnetic stimulation were used to examine ... more Functional magnetic resonance imaging and transcranial magnetic stimulation were used to examine a 34 year-old right-handed patient, who, at the age of 6 years, had experienced sudden right hemiplegia, seizures, and stupor during a bout of measles encephalitis, followed by incomplete distal right motor recovery. Morphological MRI showed massive unilateral enlargement of the left ventricle, associated with extreme thinning of the white and gray matter,with partial preservation of the pyramidal tract. Functional MRI and transcranial magnetic stimulation revealed reorganization of the motor cortices, and integrity of the corticospinal pathway, respectively. Our findings indicate that complete hand motor recovery may require functional connections between the motor cortical areas and cortical-subcortical structures, in addition to the retained integrity of the primary sensorimotor area and pyramidal tract.

International Journal of Psychophysiology, 2012