H2020Индивидуална стипендия2020–2022

C-Pre · Seeing is predicting: Testing a predictive coding account of visual perception involving saccadic eye movements

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2020-02-01 → 2022-01-31
Финансиране от ЕС: 175 572 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Зрителното възприятие се изследва чрез проверка дали информацията от периферията на окото ни помага да предвидим детайлите, които ще видим след бързо движение на погледа. Разбирането на този процес обяснява как очакванията ни влияят върху начина, по който виждаме света.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Seeing is predicting: Testing a predictive coding account of visual perception involving saccadic eye movements

We usually have the impression to see the world around us in clear detail. However, detailed vision is at any point in time limited to only a comparatively small area around the centre of the visual field, the part that corresponds to the fovea on the retina. In order to arrive at a clear impression of our complete surrounding, we scan the environment with quick and jerky, so-called saccadic, eye movements, of which we are usually not aware. These abrupt displacements of our gaze position partition the continuous stream of visual input into discrete periods during which gaze is comparatively stable, called fixations. These gaze dynamics imply that every time we perceive something foveally with high resolution we have previously seen the same thing with much worse resolution further in the visual periphery. There is always a so-called visual preview. Researchers have argued that peripheral visual preview information allows to predict upcoming foveal visual information and that this form of prediction could be understood under the currently influential frameworks of predictive processing, and more specifically, predictive coding. This has, however, not yet been tested empirically. The question addressed in the present project was, thus, whether predictive processing and predictive coding can actually explain trans-saccadic preview effects. It is important for society to understand how we, as humans, perceive the world. The present project is a particular example for the more general idea that expectations affect perception. Understanding to what extent and how exactly expectations affect perception is of utmost importance for human interaction and mutual understanding. Regarding a more technical understanding of expectations, the present project tested the limits of a currently highly influential theory of brain function, i.e. predictive coding.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

We make about three saccadic eye movements per second which bring about an abrupt and drastic change in visual input on the retina. However, visual perception seems remarkably stable. I want to determine whether this phenomenon can be explained by predictive coding. Crucial for predictive coding is the transmission of prediction and prediction error signals across brain networks. I want trace down these signals in humans with non-invasive neurophysiological and neuroimaging methods. I will record EEG and MEG data combined with eye-tracking in gaze-contingent experimental designs in which visual input changes during a saccade and in which the frequency of change is manipulate to affect higher-level trans-saccadic expectations. I will apply measures of information transfer and dynamic causal modelling to assess brain dynamics time-locked to saccadic eye-movements. This approach will provide evidence for or against pre-saccadic top-down prediction and post-saccadic bottom-up prediction error signals, which will eventually speak to the question whether predictive coding can explain the phenomenon of visual stability. The proposed action will strongly enhance my theoretical knowledge about predictive processes and it will widely extend my methodological skills about MEG, source analysis, and the analysis of brain dynamics and connectivity. The project will be conducted under the supervision of Floris de Lange at the Donders Institute, the Netherlands, and includes a secondment with Karl Friston and Rick Adams at UCL, UK, as well as cooperation with Stefano Panzeri from IIT, Italy. In sum, this project combines methods and approaches from an international set of world-leading experts in an unprecedented way to test a hypothesis derived from the currently most comprehensive theory of brain function. Therefore, this project will make a highly-innovative falsification attempt of an influential theory which could mean a crucial step in advancing the cognitive sciences.

Оригинален текст от CORDIS (на английски).

Участници

STICHTING RADBOUD UNIVERSITEIT · NijmegenКоординаторНидерландия