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Bernstein Seminar | A neural population view on how the brain controls behaviour

The analysis of neural population dynamics in several brain cortices has consistently uncovered low-dimensional subspaces that capture a significant fraction of neural variability. A model for cortical processing in which the time-dependent activation of these neural modes will be discussed.
Wann 21.07.2020
von 17:15 bis 18:00
Wo Online
Name
Kontakttelefon 0761 203-9570
Teilnehmer (PROF. JUAN ÁLVARO GALLEGO, Neuroscience & Neuropreosthetics Lab | Department of Bioengineering | Imperial College London)
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Referent/Referentin:
PROF. JUAN ÁLVARO GALLEGO (Neuroscience & Neuropreosthetics Lab | Department of Bioengineering | Imperial College London)

Termin:
Dienstag, 21.07.2020, 17:15 Uhr - 18:00 Uhr

Ort:
Online

Termin übernehmen:
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Ausführliche Beschreibung:

The analysis of neural population dynamics in several brain cortices has consistently uncovered low-dimensional subspaces that capture a significant fraction of neural variability. These “neural manifolds” are spanned by specific patterns of correlated neural activity, the “neural modes.” I will discuss a model for cortical processing in which the time-dependent activation of these neural modes, rather than the independent modulation of single neurons, controls behavior. I will first focus on how the same neural population in primary motor cortex can cause a rich set of behaviors. Single neuron activity is complex and heterogeneous and varies greatly across different tasks. Yet, the structure and even the temporal activation dynamics of some neural modes is remarkably well preserved across these different behaviors. Animals readily execute learned behaviors in a consistent manner. How does cortex achieve this stable control? We recorded from neural populations in premotor, primary motor, and somatosensory cortices for up to two years as monkeys performed the same task. Intriguingly, despite steady turnover in the recorded neurons, the activation dynamics of the neural modes remained stable. Such stability allowed reliable decoding of behavioral features for the entire timespan, while fixed decoders based on the recorded neural activity degraded substantially. Whether viewed across time or across tasks, cortex may thus generate behavior in a consistent manner through the flexible activation of combinations of neural modes, which themselves may arise from network connectivity. Given that neural modes are found throughout the brain, from prefrontal to visual and olfactory cortices, and even hippocampus, similar mechanisms may allow other areas to perform non-motor functions.  



Interne Verantwortlichkeit:
Bernstein Center Freiburg (BCF)

Veranstaltende Institution(en):
Bernstein Center Freiburg

Kontaktperson:
Name: Prof. Carsten Mehring
Tel: 0761 203-9570
E-Mail: carsten.mehring@biologie.uni-freiburg.de

Webadresse:
https://www.bcf.uni-freiburg.de/events/bernstein-seminar/20200721_Gallego

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