IS THE BRAIN A STATISTICIAN? Work in progress with Aline Duarte, - - PowerPoint PPT Presentation

▶

Apr 03, 2024 362 likes •596 views

IS THE BRAIN A STATISTICIAN? Work in progress with Aline Duarte, Guilherme Ost, Antonio Galves, Ricardo Fraiman MaClinC NeuroMat The idea that the brain continuously makes predictions about the world is becoming prevalent Vargas, Rangel and

SLIDE 1

IS THE BRAIN A STATISTICIAN?

Work in progress with Aline Duarte, Guilherme Ost, Antonio Galves, Ricardo Fraiman MaClinC NeuroMat

SLIDE 2

The idea that the brain continuously makes predictions about the world is becoming prevalent

Vargas, Rangel and Galves, 2014 http://arxiv.org/abs/1409.6744

Edweard Muybridge, 1887

SLIDE 3

PREDICTING MEANS ANTICIPATING OUTCOMES

Efferent copy: Von Helmholtz (1821 – 1894)

Causal relationships between actions and their consequences
Dynamic simulation of our body and of the context
Reduction of movement-produced uncertainties
Learning
Probabilistic estimation

The Helmholtz’ heritage Kawato et al., 1987; Jordan and Rumelhart, 1992; Jordan, 1995; Wolpert et al., 1995; Miall and Wolpert, 1996; Wolpert,1997; Mumford, Shadmehr, Friston, Dehaene and many others

SLIDE 4

…BUT HOW TO TACKLE THIS PROBLEM?

SLIDE 5

http://en.wikipedia.org/wiki/ Magnetoencephalography MAGNETOENCEPHALOGRAPHY

SLIDE 6

Activity yielded by a tone presentation Localization of auditory activation: temporal cortex

SLIDE 7

SLIDE 8

Extracellular Current flow

ELETROENCEFALOGRAPHY

http://en.wikipedia.org/wiki/ Electroencephalography (Hans Berg, 1932)

SLIDE 9

IN: ¡Quan)ta)ve ¡EEG ¡Analysis ¡Methods ¡and ¡Clinical ¡Applica)ons ¡ ¡

Ed. ¡By ¡Mar$n ¡L. ¡Yarmush, ¡Christopher ¡J. ¡James ¡(2009). ¡

¡

EVENT RELATED POTENTIALS ( in the 60’s)

SLIDE 10

S. Deahene Lectures, college de france, 2012

SLIDE 11

SLIDE 12

MISMATCH ¡NEGATIVITY ¡

SLIDE 13

Omission response

SLIDE 14

THE BRAIN DETECTS MISSING EVENTS (i.e. THOSE THAT WERE EXPECTED) AND REACTS STRONGLY TO UNEXPECTED EVENTS

SLIDE 15

A NEW EXPERIMENTAL APPROACH…

Work in progress with Aline Duarte, Guilherme Ost, Antonio Galves, Ricardo Fraiman MaCLinC NeuroMat

HAND CLAP SEQUENCES ORGANIZED IN TERNARY (waltz) QUATERNARY (samba) INDEFINITE RETRIEVING THE STRUCTURE OF THE SOURCE

SLIDE 16

RETRIEVING THE STRUCTURE OF THE SOURCE

SLIDE 17

SLIDE 18

SLIDE 19

SLIDE 20

700 ms

40 uV

Has the EEG data anything to say about the structure of the source?

SLIDE 21

SLIDE 22

Do the EEG data say anything about the structure of the source?