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Active tactile exploration using a brain-machine-brain interface

Brain implant send messages to the prothetic and then back to the brain

Tyler Arnett

on 3 October 2012

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Transcript of Active tactile exploration using a brain-machine-brain interface

Previous Methods Brain machine interfaces (BMIs) lack a reliable somatosensory feedback required for dexterous control.
They almost exclusively rely on visual feedback
Tried sensory substitution and re-innervation
Limited in application range and channel capacity
A new study introduces a new concept
Bran-machine-brain-interface (BMBI) How They Did It Multi-electrode implants are inserted in the primary motor cortex (M1) and the primary somatosensory cortex (S1) of two monkeys (M and N)
Monkeys were taught to recognize "textures" using intracortical microstimulation translated by S1
They were given rewards when they found a specified "texture"
Active tactile exploration using a brain machine brain interface Feeling Artificial "Textures" During training, monkey M surpassed chance performance after 9 sessions and monkey N did so after 4 sessions
After training the monkeys which "texture" they should feel for, the joysticks were disconnected
Monkeys then used their right hemisphere motor neurons (translated by M1) to move the cursor and "feel" the "textures"
a, Movement intentions are decoded from M1; artificial tactile feedback is delivered to S1.
b, Microwires were implanted in M1 and S1.
c, Microwires used for ICMS in monkey M are accented in red.
d, Actuator movements for a trial in which monkey M explores UAT but ultimately selects RAT. Grey bars indicate stimulation patterns; insets indicate the ICMS frequency.
e, Rastergram of M1 neurons recorded during the trial shown in d
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