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PisaVisionLab

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New Research in Psychological Science

Congratulations to Giovanni, whose latest paper has just been accepted for publication in Psych Sci.

Separate Mechanisms for Perception of Numerosity and Density (aka Numerosity IS NOT Density)

Giovanni Anobile, Marco Cicchini and David C. Burr

Despite the existence of much evidence for a number sense in humans, several researchers have questioned whether number is sensed directly or derived indirectly from texture density. Here, we provide clear evidence that numerosity and density judgments are subserved by distinct mechanisms with different psychophysical characteristics. We measured sensitivity for numerosity discrimination over a wide range of numerosities: For low densities (less than 0.25 dots/deg2), thresholds increased directly with numerosity, following Weber’s law; for higher densities, thresholds increased with the square root of texture density, a steady decrease in the Weber fraction. The existence of two different psychophysical systems is inconsistent with a model in which number is derived indirectly from noisy estimates of density and area; rather, it points to the existence of separate mechanisms for estimating density and number. These results provide strong confirmation for the existence of neural mechanisms that sense number directly, rather than indirectly from texture density.

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Last Updated on Friday, 03 July 2015 14:13

NextGenVis video

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Last Updated on Saturday, 11 May 2019 18:19

New Research published on Journal of Cognitive Neuroscience!

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New Research published on Journal of Cognitive Neuroscience!

Congratulation to AlessandroConcetta and Alice who just published a new paper on Journal of Cognitive Neuroscience!

Benedetto, A., Morrone, C. & Tomassini, A. (2019). The Common Rhythm of Action and Perception., Journal of Cognitive Neuroscience, PDF

Research in the last decade has undermined the idea of perception as a continuous process, providing strong empirical support for its rhythmic modulation. More recently, it has been revealed that the ongoing motor processes influence the rhythmic sampling of sensory information. In this review, we will focus on a growing body of evidence suggesting that oscillation-based mechanisms may structure the dynamic interplay between the motor and sensory system and provide a unified temporal frame for their effective coordination. We will describe neurophysiological data, primarily collected in animals, showing phase-locking of neuronal oscillations to the onset of (eye) movements. These data are complemented by novel evidence in humans, which demonstrate the behavioral relevance of these oscillatory modulations and their domain-general nature. Finally, we will discuss the possible implications of these modulations for action-perception coupling mechanisms.

Last Updated on Tuesday, 13 August 2019 16:29

Introduction

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...... 2018 pisavisionlab scaled Paula Andrea Maldonado Moscoso Cecilia Steinwurzel Paola Binda Luca Lo Verde Irene Togoli Alessandro Benedetto Akshatha Bhat Roberto Arrighi Maria Concetta Morrone David Burr Guido Marco Cicchini Tam Ho Giovanni Anobile Antonella Pomè Claudia Lunghi Francesca Tinelli Kyriaki Mikellidou Jan Kurzawski Marco Turi Elisa Castaldi ERC ECSPLAIN About PisaVisionLab ....

Last Updated on Monday, 27 May 2019 16:19

Autism TICS

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New Perspectives on Autism published in Trends in Cognitive Sciences

When the world becomes ‘too real’: a Bayesian explanation of autistic perception

Liz Pellicano and David Burr

Perceptual experience is influenced both by incoming sensory information and prior knowledge about the world, a concept recently formalised within Bayesian decision theory. We propose that Bayesian models can be applied to autism, a neurodevelopmental condition with atypicalities in sensation and perception, to pinpoint fundamental differences in perceptual mechanisms. We suggest specifically that attenuated Bayesian priors, ‘hypo-priors’, may be responsible for the unique perceptual experience of autistic people, leading to a tendency to perceive the world more accurately rather than modulated by prior experience. In this account, we consider how hypo-priors might explain key features of autism, the broad range of sensory and other non-social atypicalities, in addition to the phenomenological differences in autistic perception.

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Last Updated on Friday, 03 July 2015 14:15

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