186,591 research outputs found
Pitture medievali «di nessun merito» nell'Ospedale dell'Angelo al Laterano tra realtà e manipolazione storiografica
No full textMisrepresentation of horizontal space in left unilateral neglect: role of hemianopia.
No full textRight-brain-damaged patients with left unilateral neglect are reported to misperceive the horizontal extension of contralesional stimuli as being shorter than that of ipsilesional stimuli.To investigate the functional and anatomic correlates of horizontal space misrepresentation.Eight right-brain-damaged patients with contralesional neglect and complete hemianopia (N+H+), nine right-brain-damaged patients with contralesional neglect and no visual field defect (N+H-), and five unilateral brain-damaged patients with contralesional complete hemianopia and no neglect (N-H+) reproduced a horizontal distance (10 cm) in the contralesional and ipsilesional hemispace.N+H+ patients overextended the distance contralesionally and underextended the same distance ipsilesionally. N+H- and N-H+ patients reproduced equivalent distances contralesionally and ipsilesionally. Compared with N+H- patients, N+H+ patients had a greater ipsilesional shift when bisecting horizontal lines; however, these two groups of patients had comparable neglect severity on multiple-item cancellation tasks. In the N+H+ group the area of maximal overlapping of the lesion was in the posterior cerebral lobes.Complete contralesional hemianopia after posterior brain damage is an important factor in determining misrepresentation of horizontal space in patients with left unilateral neglect
Il Maestro della cappella Caldora a Subiaco : un nuovo affresco nella chiesa di San Lorenzo a Pianello
No full textSingle or dual orthographic representations for reading and spelling? a study of Italian dyslexic-dysgraphic and normal children
No full textItalian children with surface dyslexia and dysgraphia show defective orthographic lexical processing in both reading and spelling. It is unclear whether this parallelism is due to impairment of separate orthographic input and output lexicons or to a unique defective lexicon. The main aim of the present study was to compare the single- versus dual-lexicon accounts in dyslexic/dysgraphic children (and in normal but younger children). In the first experiment, 9 Italian children with surface dyslexia and dysgraphia judged the orthographic correctness (input lexicon) of their phonologically plausible misspellings (output lexicon) and of phonologically plausible spellings experimentally introduced for words they consistently spelt correctly. The children were generally impaired in recognizing phonologically plausible misspellings. Parallel deficits in reading and spelling also emerged: Children were more impaired in judging items they consistently misspelt and more accurate in judging items they always spelt correctly. In a second experiment, younger normal children with reading/spelling ability similar to that of the dyslexic/dysgraphic children in the first experiment (but younger) were examined. The results confirmed a close parallelism between the orthographic lexical representations used for reading and spelling. Overall, findings support the hypothesis that a single orthographic lexicon is responsible for reading and spelling performance in both dyslexic/dysgraphic and normal (but younger) children. © 2011 Psychology Press
Sensitivity to distributional properties of the orthography in the spelling of Italian children with dyslexia
No full textThe study examines statistical learning in the spelling of Italian children with dyslexia and typically developing readers by
studying their sensitivity to probabilistic cues in phoneme-grapheme mappings. In the first experiment children spelled
to dictation regular words and words with unpredictable spelling that contained either a high- or a low-frequency (i.e.,
typical or atypical) sound-spelling mappings. Children with dyslexia were found to rely on probabilistic cues in writing
stimuli with unpredictable spelling to a greater extent than typically developing children. The difficulties of children
with dyslexia on words with unpredictable spelling were limited to those containing atypical mappings. In the second
experiment children spelled new stimuli, that is, pseudowords, containing phonological segments with unpredictable
mappings. The interaction between lexical knowledge and reliance on probabilistic cues was examined through a lexical
priming paradigm in which pseudowords were primed by words containing related typical or atypical sound-to-spelling
mappings. In spelling pseudowords, children with dyslexia showed sensitivity to probabilistic cues in the phoneme-tographeme
mapping but lexical priming effects were also found, although to a smaller extent than in typically developing
readers. The results suggest that children with dyslexia have a limited orthographic lexicon but are able to extract
regularities from the orthographic system and rely on probabilistic cues in spelling words and pseudoword
Medioevo fatto in casa. Tracce di decorazione laica privata a Roma tra 12.e 15. secolo
No full textIl saggio presenta alcune rare tracce di affreschi medievali, conservate in dimore laiche private di Rom
Icone a «scomparto segreto»: mito e realtà di una tipologia di tavole del XIII secolo a Montevergine
No full textAmerican and European Portfolio Selection Strategies: the Markovian Approach
No full textIn this chapter we propose portfolio selection strategies using the assumption that the portfolio returns evolve as Markov processes. In particular, we distinguish the analysis for parametric and non parametric Markov processes and discuss the construction of the transition matrix in the two different cases. Under the assumption that returns are Markov processes we propose several possible strategies where the investors recalibrate their portfolios at a fixed temporal horizon or within a fixed temporal horizon. Thus, we analyze the computational complexity of the proposed strategies and propose an heuristic algorithm for the global optimum in order to overcome the intrinsic computational complexity of the proposed models. Furthermore, we show how the Markov assumption can be used to forecast the portfolio returns and we examine some simple empirical comparisons between Markovian strategies and classic reward-risk ones
Streaming generalized cross entropy
No full textWe propose a new method to combine adaptive processes with a class of entropy estimators for the case of streams of data. Starting from a first estimation obtained from a batch of initial data, model parameters are estimated at each step by combining the prior knowledge with the new observation (or a block of observations). This allows to extend the maximum entropy technique to a dynamical setting, also distinguishing between entropic contributions of the signal and the error. Furthermore, it provides a suitable approximation of standard GME problems when the exacted solutions are hard to evaluate. We test this method by performing numerical simulations at various sample sizes and batch dimensions. Moreover, we extend this analysis exploring intermediate cases between streaming GCE and standard GCE, i.e., considering blocks of observations of different sizes to update the estimates, and incorporating collinearity effects as well. The role of time in the balance between entropic contributions of signal and errors is further explored considering a variation of the Streaming GCE algorithm, namely Weighted Streaming GCE. Finally, we discuss the results: In particular, we highlight the main characteristics of this method, the range of application, and future perspectives
Stadiazione del carcinoma del colon-retto: colonografia TCMD con acqua vs aria nella valutazione dei parametri T ed N
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