Dear All,
The CEU Department of Cognitive Science and the Center for Cognitive Computation (CCC)
invites you to the upcoming meeting of the Budapest Computational Neuroscience
Forum<https://ccc.ceu.edu/budapest-computational-neuroscience-forum>um>.
Speaker: Ferenc Csikor, Wigner
Institute<https://wigner.hu/en/infopages/csikor.ferenc>
Top-down perceptual inference shaping the activity of early visual cortex
Deep discriminative models have recently provided remarkable insights into hierarchical
processing in the brain by predicting neural activity along the visual ventral pathway.
However, these models are at odds with biological systems both at the computational and
architectural levels: on the computational level, deep discriminative models rely on
supervised learning, which necessitates exhaustive labeling of experiences; and on
architectural level, these models are fundamentally feed-forward in processing incoming
stimuli, in contrast with the ventral pathway that is characterized by extensive top-down
connectivity. Here, we address these issues by developing a hierarchical deep generative
model of natural images and show that it can predict an extensive set of experimental
results in the primary and secondary visual cortices (V1 and V2, respectively). Our
analysis shows that sensitivity of V2 neurons to subtle changes of high-level statistics
of images is a consequence of learning a hierarchical representation of natural images.
Further, we show that top-down influences are natural ingredients of hierarchical
generative models, and a range of experimental phenomena concerning the mean responses and
noise correlation structure of V1 responses are a consequence of inference in this
generative model.
Time: 17:00, October 25, 2023.
Location: CEU, 1051 Bp. Nádor u. 15, FT. room 408. (restricted entry, guest cards will be
available at the reception) and Zoom (Meeting ID: 913 1139
5317<https://ceu-edu.zoom.us/j/91311395317?pwd=eFhHRkNkSWw0OXhyT1JBb2tVTkZWUT09>
Passcode: 290844)
Should you have any inquiries about the series, please contact Mihály
Bányai<mailto:mihaly.s.banyai@gmail.com>.
Best regards,
Ildikó
Ildikó Varga
Department Coordinator (Budapest)
Department of Cognitive Science
[cid:343a9326-cd32-44b2-8902-2a9a6c2f1c29]
H-1051 Budapest
Nador u. 15. FT room 404
tel: +36-1 327-3000 2941
http://www.ceu.edu<http://www.ceu.edu/>
http://cognitivescience.ceu.edu<http://cognitivescience.ceu.edu/>
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