SIMONS COMPUTATIONAL THEORIES OF THE BRAIN APRIL 18, 2018 DECODING THE FUNCTIONAL NETWORKS OF CEREBRAL CORTEX
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1 SIMONS COMPUTATIONAL THEORIES OF THE BRAIN APRIL 18, 2018 DECODING THE FUNCTIONAL NETWORKS OF CEREBRAL CORTEX
2 VISUAL CORTEX DISPLAYS ACTIVITY NOT DIRECTLY TIED TO VISUAL STIMULI J. Physiol. (I959) I47, SINGLE UNIT ACTIVITY IN STRIATE CORTEX OF UNRESTRAINED CATS BY D. H. HUBEL* From the Department of Neurophysiology, Walter Reed Army Institute of Research, Walter Reed Army Medical Center, Washington 12, D.C., U.S.A. (Received 15 December 1958) Background activity In the unrestrained preparation most units showed activity in the absence of intentional stimulation on the part of the observer. As the cat looked about, spurts and pauses in firing were seen to accompany eye movements. When the eyes were closed either passively by the observer or by the cat, firing usually persisted, although it was generally less active. Even when the room was made completely dark most units continued to fire.
3 GOALS Extend theories of cortical computation from the average case to single trials using network based analytical tools Incorporate a more comprehensive sampling of the network to include unbiased sample of neurons
4 OUTLINE Mouse V1 & high speed two-photon imaging What are functional networks? Functional networks accurately predict neuronal activity Higher order structure in functional networks Assemblies
5 OUR EXPERIMENTAL SET-UP Awake behaving (ambulating) animals Window over V1 Head bar Top down view
6 RETINOTOPY TO CONFIRM VISUAL CORTEX Window over V1 Head bar Top down view Intrinsic Imaging Two Photon Imaging
7 IN VIVO 2P SOMATIC IMAGING OF VISUALLY EVOKED ACTIVITY
8 CORTICAL V1 MICROCIRCUIT DYNAMICS IMAGED WITH HOPS
9 MULTINEURONAL RESPONSES TO DRIFTING GRATINGS grating direction neurons R normalized activity (A.U.) 10 cm/s Running speed (s)
10 REPRESENTATIVE TUNED AND UNTUNED RESPONSES grating direction Cell 1 Cell 2 Cell 3 Cell 4 Cell 5
11 TUNED NEURONS SHOW VARIABLE SINGLE TRIAL ACTIVITY 90 trials norm. fluorescence time
12 TUNED NEURONS SHOW VARIABLE SINGLE TRIAL ACTIVITY 1 trials norm. fluorescence trials time 30 1 s
13 TUNING DOESN T PREDICT SINGLE TRIAL RESPONSES VERY WELL probability density tuned (2613 / 4535) untuned (1922 / 4535) variance explained
14 OUTLINE Mouse V1 & high speed two-photon imaging What are functional networks? Functional networks accurately predict neuronal activity Higher order structure in functional networks
15 Network: A mathema)cal representa)on of a real-world complex system defined by a collec)on of nodes (ver)ces) and links (edges) between pairs of nodes.
16 BUILDING A FUNCTIONAL NETWORK USING PAIRWISE PARTIAL CORRELATION Edge weight = partial correlation w = % 20 sec within movie activity i,j remaining movie average i,j within movie average k i,j Directionality = correlogram lag zero lag i j t max
17 FUNCTIONAL NETWORKS CONTAIN EDGES BETWEEN TUNED AND UNTUNED NEURONS tuned neuron id untuned 0.4 neuron id tuned untuned edge weight
18 FUNCTIONAL NETWORKS REFLECT TUNING IN THE POPULATION neuron id neuron id tuned untuned tuned untuned edge weight edge weight tuned - tuned tuned - untuned untuned - untuned difference in preferred direction (o)
19 OUTLINE Mouse V1 & high speed two-photon imaging What are functional networks? Functional networks accurately predict neuronal activity Higher order structure in functional networks
20 MODELING NEURON RESPONSES USING FUNCTIONAL NETWORKS W 1 W2 50% ΔF 20 sec rescale W n input neuron activity weights tuned neuron id untuned 0.4 neuron id tuned untuned edge weight
21 ACCURATE PREDICTION OF MOMENT TO MOMENT ACTIVITY USING FUNCTIONAL NETWORKS W1 50% ΔF 20 sec 50% ΔF 20 sec W 2 Wn rescale input neuron activity weights predicted activity / measured activity
22 FUNCTIONAL NETWORKS PROVIDE NEAR OPTIMAL PREDICTIONS OF SINGLE TRIAL RESPONSES 50% predicted activity / measured activity 20 sec optimal weights (MSE) graph weights (MSE)
23 FUNCTIONAL NETWORKS ALSO PREDICT TUNING 600 Cosine similarity < Cosine similarity = neuron count predicted tuning vector (cosine similarity)
24 POPULATION SIZE UNDERLIES PREDICTION ACCURACY population variance explained neurons
25 LARGE WEIGHTS CONTRIBUTE DISPROPORTIONATELY TO PREDICTION ACCURACY strongest first random weakest first % total MSE fraction weight removed
26 RECURRENT CONNECTIONS ARE BIASED TOWARD LARGE EDGE WEIGHTS reciprocal probability (fold over random) 10 1 within tuned within untuned between tuned & untuned edge weight threshold (quantile)
27 OUTLINE Mouse V1 & high speed two-photon imaging What are functional networks? Functional networks accurately predict neuronal activity moment to moment prediction Higher order structure in functional networks
28 BEYOND PAIRWISE undirected Directed fan-in fan-out middleman cycle
29 TRIPLET MOTIF STRUCTURE IN FUNCTIONAL NETWORKS undirected cycle middle-man fan-in fan-out clustering coefficient (fold over Random)
30 variance explained TRIPLET MOTIF STRUCTURE UNDERLIES PREDICTION ACCURACY 1 undirected cycle 0.8 middle fan-in 0.6 fan-out clustering coefficient (fold over ER) 0.4 middle Dominance of Motif (z-score)
31 CONCLUSIONS Neurons are variable making prediction of single trial activity from tuning properties difficult Functional networks provide near optimal predictions of activity in individual neurons And predict tuning Triplet correlations are predictive of more than 90% of a moment to moment activity
32 ASSEMBLIES Data demonstrates a loose coalition of neurons that covary with one another and consequently are predictive of one another Multineuronal activity shows pairwise timing differences as indicated by the fact that the majority of entries in the matrix are asymmetric But many unknowns
33 ACKNOWLEDGMENTS Current Lab Joe Dechery Vaughn Spurrier Maayan Levy Peter Malonis Zania Zayyad Kyle Bojanek Subhodh Kotekal Isabel Garon Carolina Yu Harrison Grier Friederice Pirschen Anne Havlik Lab Alumni Brendan Chambers Alex Sadovsky Peter Kruskal Melissa Runfeldt Lucy Li SJ Weinberg Veronika Hanko Lane McIntosh Suchin Gururangan Charles Frye Alexa Carlson Caroline Heimerl Isabella Penido Areknaz Khaligian Audrey Sederberg FACCTS
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