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pisavisionlab home about us people faculty david burr maria concetta morrone roberto arrighi paola binda guido marco cicchini claudia lunghi stefano baldassi postdocs giovanni anobile alessandro benedetto elisa castaldi kyriaki mikellidou marco turi graduate students akshatha bhat tam ho jan kurzawski luca lo verde paula andrea maldonado moscoso antonella pomè irene togoli external collaborator sofia crespi monica gori liz pellicano francesca tinelli former lab members david aagten-murphy michele fornaciai michela panichi eckart zimmermann publications projects ecsplain publications and media ecsplain publications media coverage conferences, seminars and dissemination activities seminars organization spade workshop 2018 imrf 2015 sfx 2014 people stanib memory seminars & events spade workshop 2018 upcoming seminars and events previous seminars and events sfx 2014 active vision workshop 2013 spade workshop teaching david burr teaching maria concetta morrone teaching lezioni fisiologia - unipi - scienze motorie i nostri esperimenti contattaci archives join us on facebook skip to content join us on facebook ... ... .... research new research published in scientific reports congratulations to koulla , dave and concetta who published a new paper on scientific reports! mikellidou, k., frijia, f., montanaro, d., greco, v., burr, d. c. & morrone, m. c. (2018). cortical bold responses to moderate- and high-speed motion in the human visual cortex , sci rep, 1 (8), 8357. pdf we investigated the bold response of visual cortical and sub-cortical regions to fast drifting motion presented over wide fields, including the far periphery. stimuli were sinusoidal gratings of 50% contrast moving at moderate and very high speeds (38 and 570 degrees /s), projected to a large field of view (~60 degrees ). both stimuli generated strong and balanced responses in the lateral geniculate nucleus and the superior colliculus. in visual cortical areas, responses were evaluated at three different eccentricities: central 0-15 degrees ; peripheral 20-30 degrees ; and extreme peripheral 30-60 degrees . "ventral stream" areas (v2, v3, v4) preferred moderate-speeds in the central visual field, while motion area mt+ responded equally well to both speeds at all eccentricities. in all other areas and eccentricities bold responses were significant and equally strong for both types of moving stimuli. support vector machine showed that the direction of the fast-speed motion could be successfully decoded from the bold response in all visual areas, suggesting that responses are mediated by motion mechanisms rather than being an unspecific preference for fast rate of flicker. the results show that the visual cortex responds to very fast motion, at speeds generated when we move our eyes rapidly, or when moving objects pass by closely. research new research published on journal of vision! congratulation to michele , paola e marco who just published a new paper on journal of vision! fornaciai, m., binda, p. & cicchini, g. m. (2018). trans-saccadic integration of orientation information, j vis, 4 (18), 9. pdf does visual processing start anew after each eye movement, or is information integrated across saccades? here we test a strong prediction of the integration hypothesis: that information acquired after a saccade interferes with the perception of images acquired before the saccade. we investigate perception of a basic visual feature, grating orientation, and we take advantage of a delayed interference phenomenon-in human participants, the reported orientation of a target grating, briefly presented at an eccentric location, is strongly biased toward the orientation of flanker gratings that are flashed shortly after the target. crucially, we find that the effect is the same whether or not a saccade is made during the delay interval even though the eye movement produces a large retinotopic separation between target and flankers. however, the trans-saccadic effect nearly vanishes when flankers are displaced to a different screen location even when this location matches the retinotopic coordinates of the target. we conclude that information about grating orientation is integrated across saccades within a spatial region that is defined in external coordinates and thereby is stable in spite of the movement of the eyes. research new research published on cortex! congratulation to elisa , francesca , marco and concetta who just published a new paper on cortex! castaldi, e., tinelli, f., cicchini, m. & morrone, m. c. (2018). supramodal agnosia for oblique mirror orientation in patients with periventricular leukomalacia, cortex, pdf periventricular leukomalacia (pvl) is characterized by focal necrosis at the level of the periventricular white matter, often observed in preterm infants. pvl is frequently associated with motor impairment and with visual deficits affecting primary stages of visual processes as well as higher visual cognitive abilities. here we describe six pvl subjects, with normal verbal iq, showing orientation perception deficits in both the haptic and visual domains. subjects were asked to compare the orientation of two stimuli presented simultaneously or sequentially, using both a two alternative forced choice (2afc) orientation-discrimination and a matching procedure. visual stimuli were oriented gratings or bars or collinear short lines embedded within a random pattern. haptic stimuli comprised two rotatable wooden sticks. pvl patients performed at chance in discriminating the oblique orientation, both for visual and haptic stimuli. moreover when asked to reproduce the oblique orientation, they often oriented the stimulus along the symmetric mirror orientation. the deficit generalized to stimuli varying in many low level features, was invariant for spatiotopic object orientation, and also occurred for sequential presentations. the deficit was specific to oblique orientations, and not for horizontal or vertical stimuli. these findings show that pvl can affect a specific network involved with the supramodal perception of mirror symmetry orientation. research new research published in scientific reports! congratulation to eckart , paola and concetta who just published a new paper in scientific reports! zimmermann, e., morrone, m. c. & binda, p. (2018). perception during double-step saccades, sci rep, 1 (8), 320. pdf how the visual system achieves perceptual stability across saccadic eye movements is a long-standing question in neuroscience. it has been proposed that an efference copy informs vision about upcoming saccades, and this might lead to shifting spatial coordinates and suppressing image motion. here we ask whether these two aspects of visual stability are interdependent or may be dissociated under special conditions. we study a memory-guided double-step saccade task, where two saccades are executed in quick succession. previous studies have led to the hypothesis that in this paradigm the two saccades are planned in parallel, with a single efference copy signal generated at the start of the double-step sequence, i.e. before the first saccade. in line with this hypothesis, we find that visual stability is impaired during the second saccade, which is consistent with (accurate) efference copy information being unavailable during the second saccade. however, we find that saccadic suppression is normal during the second saccade. thus, the second saccade of a double-step sequence instantiates a dissociation between visual stability and saccadic suppression: stability is impaired even though suppression is strong. research interesting dispatch in current biology by marco tamietto and david leopold on the recent study by koulla , jan , david and concetta about area prostriata in the human brain ! pdf human area prostriata is a small, unstudied portion of the visual brain set deep in the calcarine sulcus, next to v1. a recent neuroimaging study in humans indicates that this area is specialized to respond to rapidly moving stimuli in the far periphery, consistent with single-unit responses in other mammals. media congratulations to koulla , roberto , francesca , sofia and concetta for having the research recommended in f1000prime! your article: plasticity of the human visual brain after an early cortical lesion., neuropsychologia, 2017 (doi: 10.3410/f.732073581.793538629) , has been recommended in f1000prime as being of special significance in its field by f1000 faculty member marlene behrmann. research new research published in scientific reports! congratulation to david who just published a new paper in scientific reports! alexi, j., cleary, d., dommisse, k., palermo, r., kloth, n., burr, d., et al. (2018). past visual experiences weigh in on body size estimation, scientific reports, 1 (8), pdf body size is a salient marker of physical health, with extremes implicated in various mental and physical health issues. it is therefore important to understand the mechanisms of perception of body size of self and others. we report a novel technique we term the bodyline, based on the numberline technique in numerosity studies. one hundred and three young women judged the size of sequentially presented female body images by positioning a marker on a line, delineated with images of extreme sizes. participants performed this task easily and well, with average standard deviations less than 6% of the total scale. critically, judgments of size were biased towards the previously viewed body, demonstrating that serial dependencies occur in the judgment of body size. the magnitude of serial dependence was well predicted by a simple kalman-filter ideal-observer model, suggesting that serial dependence occurs in an optimal, adaptive way to improve performance in size judgments. research new research published on journal of numerical cognition! congratulation to giovanni , marco , antonella and david who just published a new paper on journal of numerical cognition! a special congratulation to antonella for her first publication! anobile, g., cicchini, g. m., pomè, a. & burr, d. (2017). connecting visual objects reduces perceived numerosity and density for sparse but not dense patterns, journal of numerical cognition, 4 (3), pdf how is numerosity encoded by the visual system? – directly, or derived indirectly from texture density? we recently suggested that the numerosity of sparse patterns is encoded directly by dedicated mechanisms (which have been described as the “approximate number system” ans). however, at high dot densities, where items become “crowded” and difficult to segregate, “texture-density” mechanisms come into play. here we tested the importance of item segmentation on numerosity and density perception at various stimulus densities, by measuring the effect of connecting visual objects with thin lines. the results confirmed many previous studies showing that connecting items robustly reduces the apparent numerosity of patterns of moderate density. we further showed that the apparent density of moderate-density patterns is also reduced by connecting the dots. crucially, we found that both these effects are strongly reduced at higher numerosities. indeed for density judgments, the effect reverses, so connecting dots in dense patterns increases the apparent density (as expected from the physical characteristics). the results provide clear support for the three-regime framework of number perception, and suggest that for moderately sparse stimuli, numerosity – but not texture-density – is perceived directly. more articles... new research published on current biology! new research published on neuropsychologia! new research published in scientific reports new research published on current biology! evidence for a number sense perceiving numerosityy from birth new spotlight published on trends in neuroscience new research published on journal of neurophysiology! page 1 of 10 « start prev 1 2 3 4 5 6 7 8 9 10 next end » main menu home about us people publications projects seminars & events spade workshop teaching i nostri esperimenti archives join us on facebook login username password remember me forgot your password? forgot your username? search how to find us in pisa upcoming seminars & events spade workshop 2018 latest publications new research published in scientific reports new dispatch in current biology f1000prime new research published in scientific reports new research published in journal of cognitive neuroscience who is online we have 4 guests online you are here: home top skip to content

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