288 research outputs found
Structural development and major unconformities of the NAM Conson basin, offshore Vietnam
No full textDue to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to [email protected], referencing the URI of the item.Includes bibliographical references.Issued also on microfiche from Lange Micrographics.Two major unconformities, Middle Miocene (15.5 Ma) and Top of Basement (66.5 Ma), were identified and mapped within the Nam Conson basin using 2700 km of migrated, multifold, seismic reflection data. The results show that the Nam Conson basin is an asymmetric, extensional basin. It formed as a result of Oligocene and then Middle Miocene, NW-SE extension. The extrusion of the Indochina microplate and synchronous, left lateral motion at the terminus of the Mekong fault caused the Oligocene extension that formed the initial structure of the Nam Conson basin. In the Early Miocene, NW-SE seafloor spreading in the South China Sea southwest subbasin rapidly propagated southwestward reaching the Nam Conson basin in the Middle Miocene. This rapid southwest propagation was probably due in part to a NE-SW zone of weakness caused by the Oligocene extension. The resulting, Middle Miocene extension produced additional extensive NE-SW striking normal faulting, formation of half grabens, and the emplacement of an intrusive, axial zone on strike with the southwest subbasin spreading center.These results confirm the Miocene age given to the magnetic anomalies of the southwest subbasin by Taylor and Hayes (1980, 1983) and more recently by Briais et al. (1993). This study throws doubt on the model of Ru and Pigott (1986), who concluded that the South China Sea basin initially opened in the southwest during the Cretaceous. The two periods of NW-SE extension found in the Nam Conson basin created by the Oligocene left-lateral fault movement and the Middle Miocene seanoor spreading of the southwest subbasin support some components of the collision extrusion model proposed by Tapponnier et al. (1982, 1986). Identification of several additional unconformities in the seismic data show how the Nam Conson basin developed after the Middle Miocene, through the subsequent infilling of accommodation space overlying the tilted fault blocks; compression: deposition of a transparent sequence during a period of quiescence and thermal subsidence; and channelization of the transparent sequence followed by the deposition of another sedimentary sequence. Apparent Miocene to Recent volcanoes were also identified along 1090 E
Impaired Conscious Recognition of Negative Facial Expressions in Patients with Locked-in Syndrome
No full textThe involvement of facial mimicry in different aspects of human emotional processing is widely debated. However, little is known about
relationships between voluntary activation of facial musculature and conscious recognition of facial expressions. To address this issue,
we assessed severely motor-disabled patients with complete paralysis of voluntary facial movements due to lesions of the ventral pons
[locked-in syndrome (LIS)]. Patients were required to recognize others’ facial expressions and to rate their own emotional responses to
presentation of affective scenes.LISpatientswere selectivelyimpairedin recognition of negativefacial expressions,thusdemonstratingthatthe
voluntary activation of mimicry represents a high-level simulation mechanism crucially involved in explicit attribution of emotions
Perché non bisogna parlare al telefonino mentre si guida: l’attenzione ed i suoi scherzi
No full textMovement velocity effects on kinaesthetic localisation of spatial position
No full textIn the present study, we examined how subjectslocate spatial positions and code them in short-termmemory. In the first experiment, blindfolded subjects wereasked to perform movements in the near or farperipersonal space (criterion movement, CM). Then,subjects had to reach the end-point of CM (reproductionmovement, RM). Movements could be performed eitherslowly or rapidly. Also, CM and RM could be performedwith the same (congruent conditions) or different velocity(incongruent conditions). The results showed that performancewas accurate in the two congruent conditions.Conversely, in the incongruent conditions, subjects madeundershoot errors when the CM was fast and overshooterrors when it was slow. In the second experiment,blindfolded subjects also performed CM and RM incongruent or incongruent conditions. However, the CMand RM could start from the same or different position.We found again undershoot errors when the CM was fastand RM was slow and overshoot errors in the reversecondition. The results of both experiments suggest that theinformation about movement velocity contributes to thekinaesthetic coding in memory of a spatial location to bereached with arm movement
Opsoclonus-myoclonus syndrome in patients with locked-in syndrome: a therapeutic porthole with gabapentin
No full textOpsoclonus-myoclonus syndrome in patients with locked-in syndrome: a therapeutic porthole with gabapentin
No full textPET/CT in radiation oncology
No full textThe progressive integration of positron emission tomography/computed tomography (PET/CT) imaging in radiation therapy has its rationale in the biological intertumoral and intratumoral heterogeneity of ma- lignant lesions that require the individual adjustment of radiation dose to obtain an effective local tumor control in cancer patients. PET/CT provides information on the biological features of tumor lesions such as metabolism, hypoxia, and proliferation that can identify radioresistant regions and be exploited to optimize treatment plans. Here, we provide an overview of the basic principles of PET-based target vol- ume selection and definition using 18F-fluorodeoxyglucose (18F-FDG) and then we focus on the emerging strategies of dose painting and adaptive radiotherapy using different tracers. Previous studies provided consistent evidence that integration of 18F-FDG PET/CT in radiotherapy planning improves delineation of target volumes and reduces the uncertainties and variabilities of anatomical delineation of tumor sites. PET-based dose painting and adaptive radiotherapy are feasible strategies although their clinical imple- mentation is highly demanding and requires strong technical, computational, and logistic efforts. Further prospective clinical trials evaluating local tumor control, survival, and toxicity of these emerging strate- gies will promote the full integration of PET/CT in radiation oncology
Neuropsicologia e sindromi psichiatriche.
No full textModelli neurobiologici delle maggiori malattie mentali: Depressione, Disturbi Ansiosi, Schizofrenia e disturbi somatoform
Mental simulation of whole-body movements in patients with isolated cervical dystonia
No full textObjective: To explore mental transformation of whole-body images in patients with isolated cervical
dystonia (CD).
Background: Mental transformation of bodies or of body-part images is performed by simulating one’s
own actual movements, and is likely to rely upon brain systems involved in motor planning and execution.
Patients with CD have various clinical presentations with different degrees of postural abnormality
consistent with severity of dystonia. Previous evidence showed that CD patients were slower and less
accurate than healthy controls in mentally rotating both affected (neck) and unaffected (hands and feet)
body parts, but they also showed a non-significant decrement in their ability to mentally transform noncorporeal
objects (Fiorio et al. 2007). Thus, it cannot be established whether CD patients are unable to
simulate one’s own body movements (embodied simulation) or have a more general deficit in mental
rotation. Here, we tested embodied simulation processes in CD patients by a whole-body transformation
task.
Methods: Eighteen patients with isolated CD under treatment with botulinum toxin and no general
cognitive disorders, as assessed by formal neuropsychological examination, and 18 healthy controls,
matched for age and education, underwent the whole-body transformation task. Participants had to
perform left-right judgments on a schematic figure representing a front-facing or a back-facing human
body in different spatial orientations (Conson et al. 2014). Both Reaction Times (RTs) and error rates were
recorded.
Results: A four-way mixed-design ANOVA was performed on correct RTs, with stimulus posture (frontfacing
and back-facing) and stimulus orientation (0°, 90°, 180° and 270°) as within-subject factors, and
with group (CD patients and controls) as a between-subject factor. The main result was a significant
interaction among the three factor, F(3,102)=3,350, p= .047, partial h2 = .107, demonstrating that CD
patients were slower than controls when judging back-facing, but not front-facing bodies, in specific
spatial orientations.
Conclusions: These findings showing that CD patients were specifically impaired in mentally transforming
back-facing body images suggest that simulation of whole-body movements is impaired in this clinical
population when embodied simulation processes come into play
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