Predictions and errors are distinctly represented across V1 layers

Add to your list(s) Download to your calendar using vCal

• Ivan Tomic
• Wednesday 04 September 2024, 14:00-15:00
• https://cam-ac-uk.zoom.us/j/92612577704?pwd=MUtqMjVQdXNmUTVIYjRkMG1NUW9GZz09.

If you have a question about this talk, please contact Adam Triabhall.

This week we will discuss and debate a very recent paper by Thomas and colleagues, published in Current Biology (2024).

Abstract: “Popular accounts of mind and brain propose that the brain continuously forms predictions about future sensory inputs and combines predictions with inputs to determine what we perceive. Under “predictive processing” schemes, such integration is supported by the hierarchical organization of the cortex, whereby feedback connections communicate predictions from higher-level deep layers to agranular (superficial and deep) lower-level layers. Predictions are compared with input to compute the “prediction error,” which is transmitted up the hierarchy from superficial layers of lower cortical regions to the middle layers of higher areas, to update higher-level predictions until errors are reconciled. In the primary visual cortex (V1), predictions have thereby been proposed to influence representations in deep layers while error signals may be computed in superficial layers. Despite the framework’s popularity, there is little evidence for these functional distinctions because, to our knowledge, unexpected sensory events have not previously been presented in human laminar paradigms to contrast against expected events. To this end, this 7T fMRI study contrasted V1 responses to expected (75% likely) and unexpected (25%) Gabor orientations. Multivariate decoding analyses revealed an interaction between expectation and layer, such that expected events could be decoded with comparable accuracy across layers, while unexpected events could only be decoded in superficial laminae. Although these results are in line with these accounts that have been popular for decades, such distinctions have not previously been demonstrated in humans. We discuss how both prediction and error processes may operate together to shape our unitary perceptual experiences” (Thomas et al., 2024).

Reference: Thomas, E. R., Haarsma, J., Nicholson, J., Yon, D., Kok, P., & Press, C. (2024). Predictions and errors are distinctly represented across V1 layers. Current Biology, 34(10), 2265-2271.e4. https://doi.org/10.1016/j.cub.2024.04.036

This talk is part of the The Craik Journal Club series.

This talk is included in these lists:

• The Craik Journal Club
• https://cam-ac-uk.zoom.us/j/92612577704?pwd=MUtqMjVQdXNmUTVIYjRkMG1NUW9GZz09
• se456's list

Note that ex-directory lists are not shown.