Optical Topography - Online Article

What is Optical Topography?

  • Technology which sends a small amount of infrared light through the brain's surface to map out changes in blood flow.
  • This technique provides the"Real-Time" Measurement of brain's activity.
  • Measurement can be done under more natural condition.

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Principle of Optical Topography

 

It uses near infra red light to measure changes in blood hemoglobin Concentration in brain. Measure the changes of OXY - DEOXY Hemoglobin concentration. Measure total blood volume changes in Cerebral Cortex.

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System Configuration

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Brain-machine interface

  • Cap connects by optical fibers to a mapping device.
  • Compact headband and mapping machine can control electronic devices by simply thinking.

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Practical Proofs

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Medical Applications

  • Could help disabled people operate wheelchairs, beds, or artificial limbs.
  • Would initially help people with paralyzing diseases for communication even after losing control of their muscles.
  • An Infant's brain activity is measured.

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Future Applications

  • Could replace remote controls and keyboards.
  • Remote control could turn TV on and off or switch channels just by thinking.
  • A Germany based car company use it's driving application.

Barriers

  • Have to tweak the interface to more accurately pick up on the correct signals while ignoring background brain activity.
  • Size, since it's a cap (Hitachi's is 2lbs).
  • How lazy are we becoming if we can't push a button to turn ON the TV.

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