ABC Colloquium: Lars Muckli
Centre for Cognitive Neuroimaging, University of Glasgow
Predictive coding of auditory and contextual information in early visual cortex – evidence from layer specific fMRI brain reading
Ultra-high field (7T) layer specific brain imaging of top-down internal models
Normal brain function involves the interaction of internal processes with incoming sensory stimuli.
We have created a series of brain imaging experiments that sample internal models and feedback mechanisms in early visual cortex. Primary visual cortex (V1) is the entry-stage for cortical processing of visual information. We can show that there are two information counter-streams concerned with:
(1) retinotopic visual input and
(2) top-down predictions of internal models generated by the brain.
Our results speak to the conceptual framework of predictive coding. Internal models amplify and disamplify incoming information. The brain is a prediction-machinery. Healthy brain function will strike a balance between precision of prediction and prediction update based on prediction error.
Our results incorporate state of the art, layer-specific ultra-high field fMRI and other imaging techniques.