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New Research in Current Biology

Congratulations to Roberto, who's latest paper just got accepted for publication in Current Biology. The paper reports a strong link between the ability of executing motor acts and having efficient perceptual sensitivity.

Reduced perceptual sensitivity for biological motion in paraplegia patients
Roberto Arrighi, Giulia Cartocci, and David C. Burr

(Read More - PDF)

In the News: "That strange mechanism by which we see the world delayed"
visual world we perceive seems stable - despite all the changes and movements we see. Researchers (including Concetta Morrone) have proposed that this stability is the result of simultaneous modifications of both space and time neural mechanisms which are anchored in external space. Everytime we move our eyes, there could be a reorganization of the connections between neurons to ensure stability - and this results in a distortion between real and perceived time. To accommodate this change, the brain must reset both the inner and the 'real' clock at the end of each ocular movement. (Article is in Italian)
(Read more: Italian)

New Research in Current Biology
Congratulations to Claudia, who's latest paper just got accepted for publication in Current Biology.

Brief periods of monocular deprivation disrupt ocular balance in human adult visual cortex
Claudia Lunghi, David C. Burr and Concetta Morrone

Neuroplasticity is a fundamental property of the developing mammalian visual system, with residual potential in adult human cortex. A short period of abnormal visual experience (such as occlusion of one eye) before closure of the critical period has dramatic and permanent neural consequences, reshaping visual cortical organization in favour of the non-deprived eye. We used binocular rivalry — a sensitive probe of neural competition — to demonstrate that adult human visual cortex retains a surprisingly high degree of neural plasticity, with important perceptual consequences. We report that 150 minutes of monocular deprivation strongly affects the dynamics of binocular rivalry, unexpectedly causing the deprived eye to prevail in conscious perception twice as much as the non-deprived eye, with significant effects for up to 90 minutes. Apparent contrast of stimuli presented to the deprived eye was also increased, suggesting that the deprivation acts by up-regulation of cortical gain-control mechanisms of the deprived eye. The results suggest that adult visual cortex retains a good deal of plasticity that could be important.

(Read More - PDF)

New Research in Current Biology
Congratulations to Eckart, who's latest paper just got accepted for publication in current biology.

Spatiotopic Visual Maps Revealed by Saccadic Adaptation in Humans

Eckart Zimmerman, David C. Burr and Concetta Morrone

Saccadic adaptation is a powerful experimental paradigm to probe the mechanisms of eye movement control and spatial vision, in which saccadic amplitudes change in response to false visual feedback. The adaptation occurs primarily in the motor system, but there is also evidence for visual adaptation, depending on the size and the permanence of the postsaccadic error. Here we confirm that adaptation has a strong visual component and show that the visual component of the adaptation is spatially selective in external, not retinal coordinates. Subjects performed a memory-guided, double-saccade, outward-adaptation task designed to maximize visual adaptation and to dissociate the visual and motor corrections. When the memorized saccadic target was in the same position (in external space) as that used in the adaptation training, saccade targeting was strongly influenced by adaptation (even if not matched in retinal or cranial position), but when in the same retinal or cranial but different external spatial position, targeting was unaffected by adaptation, demonstrating unequivocal spatiotopic selectivity. These results point to the existence of a spatiotopic neural representation for eye movement control that adapts in response to saccade error signals.

(Read More - PDF)

Interview: John Ross interviewed in Current Biology

John Ross, David Burr's mentor and collaborator, has been interviewed by Current Biology. 
Read on to hear about his expoits, his path through research and some sound advice about approaching science.

(Read more: PDF)

In the News: Referee's and offside (as seen on TGT Italia 7)
Roberto Arrighi, a researcher in Pisa Vision Lab, was interviewed recently on television for TGT Italia 7 about the role that perceptual limitations and visual system strategies have when referee's determine whether a player is offside or not. (News report is in Italian).
(Youtube link: Italian)

In the News: Space, Time and number in the brain - A strong connection at the visual perception level: the Pisa Vision Lab research

Space, time and numbers are correlated in our sense perception in a much higher measure than is usually thought. The inter-University project known as STANIB (Space, Time and Numbers in the Brain) created by the Pisa Vision Lab, is a 5 year project which, in a decisively innovative way, investigates our way of perceiving space and time by considering them together and not as two independent and separate dimensions. The strong connection, which resounds in the tradition of physics both ancient (Aristotle) and contemporary (Einsteinian concept of space-time) is new for studies on perception.
(Read more: English)
(Read more: Italian)

In the News: "If the referee makes a mistake when calling an offside? It is a perception problem"
The Pisa Vision Lab researchers demonstrate that a referee might make a mistake no just he is being paid to, but that the mistake could be due to confusion and an increased number of visual stimuli. (Article is in Italian)
(Read more: Italian)

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