dmet 1058: brain computer interfacesmet.guc.edu.eg/download.ashx?id=29670&file=bci_29670.pdf ·...
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German University in Cairo –Spring 2018
T U T O R I A L - 1 : I N T R O T O B C I – H U M A N B R A I N I
DMET 1058: BRAIN COMPUTER INTERFACES
Eng. Eslam OsamaDr. Wael Abouelsaadat
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SESSION AGENDA
1. Course Grading Schema 2. Contact Info3. What’s BCI?4. BCI Applications5. Generic BCI Architecture6. Human Brain7. Brain waves8. Practice Assignment 1
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1. COURSE GRADING SCHEMA
• 3 Quizzes (best 2) 20%
• Project 30%
• Final Exam 50%
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2. CONTACT INFO
• Dr. Wael Abouelsaadat• Email: [email protected]• Office Location: C7–208
• Eng. Eslam Osama• Email: [email protected]• Office Location: C6–305• Official Office Hours: 1 Slots –TBA (according to your
schedule)• Extra office hours can be requested by mail or proposed by
me on MET Announcement page.
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2. CONTACT INFO –CONT’D
• Dr. Hisham Othman• Email: [email protected]• Office Location: C7–308
• Eng. Yasmine Azzazi• Email: [email protected]• Office Location: C3–205• Official Office Hours: 1 Slots –TBA (according to your
schedule)• Extra office hours can be requested by mail or proposed by
me on MET Announcement page.
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3. WHAT’S BCI?
• Current Human Computer Interaction (HCI): Human controls virtual or physical objects using muscular activity.
• Examples- Mouse à Hand/Finger movements- Keyboard à Hand/Finger movements- Joystick à Hand/Arm movements- Steering wheel, buttons, and pedals ….
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3. WHAT’S BCI? –CONT’D
• Brain-Computer Interface (BCI): A device that utilizes brain activity for direct control of physical or virtual objects without using muscular activity or body movements.
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4. BCI APPLICATIONS
• Quadruple Paraplegic Users:① BCI speller• using ERPs (P300)• slow (noticeable)
②BCI Prosthetics Controller• using brain signals• ex. Wheelchairs, arms …etc.
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4. BCI APPLICATIONS –CONT’D
• Gaming§ Moving in-game character
• Detecting mental state
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5. GENERIC BCI ARCHITECTURE
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• The following is a generic BCI that aims to translate brain activity into control commands for a device.
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5. GENERIC BCI ARCHITECTURE –CONT’D
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• The process involves….- Brain Recording: Acquiring brain signals via invasive/non-
invasive recording techniques
- Signal Processing: Pre-processing the raw signals by applying filters (ex. Bandpass filter), and artifact reduction/feature extraction techniques
- Pattern recognition and ML: This stage generates a control signal based on patterns in the input, typically using machine-learning techniques
- Sensory Feedback: The control signal from the BCI causes a change in the environment
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6. HUMAN BRAIN
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• Gray Matter• Contains most of the brain's neural cells.
• Includes regions of the brain involved in muscle control, and sensory perception such as seeing and hearing, memory, emotions, speech, decision making, and self-control.
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6. HUMAN BRAIN –CONT’D
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• Neurons- The workhorse of the brain- A complex electrochemical device that receives
information from hundreds of other neurons, processes this information, and conveys its output to hundreds of other neurons.
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6. HUMAN BRAIN –CONT’D
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• Neurons – How they work?
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6. HUMAN BRAIN –CONT’D
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• Brain Lobes• Our brain contains 4 lobes • Each one is responsible for a set of abilities
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6. HUMAN BRAIN –CONT’D
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Frontal Lobe
• Cognition & Memory
• Concentrate and elaborate thoughts
• Reasoning
• Motor skills
• Personality and emotional traits
Parietal Lobe
• Sensory input processing
• Sensory discrimination
• Body orientation
Temporal Lobe
• Auditory reception and association
• Emotional expression
• Languages
• Info retrieval
Occipital Lobe
• Visual reception
• Visual association (interpretation)
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6. HUMAN BRAIN –CONT’D
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• Electrode placement…
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7. BRAIN WAVES
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1. Delta waves
2. Theta waves
3. Alpha waves
4. Beta waves
5. Gamma waves
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7. BRAIN WAVES –CONT’D
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Type Frequency Amplitude Location Mental State
Delta <4 Hz (very low) very high everywhere occur during deep sleep (dreamless), coma.
Theta 4-7 Hz – temporal and parietal
light sleep (dreaming) or extreme relaxation.
Alpha 8-12 Hz – occipital and parietal
awake but relaxed and not processing much information
Beta 12-32 Hz – parietal and frontal
normal waking state of consciousness when attention is directed towards cognitive tasks and the outside world
Gamma >32 Hz(very high) –Fastest wave
very low – formation of ideas, language and memory processing, and
various types of learning
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7. BRAIN WAVES –CONT’D
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• How to record brain activities ?!- EEG (electroencephalogram)• Signals acquired from a cap of
electrodes that contact scalp through a gel
• Signals are in microvolts range àneed to be amplified
• Produces low signal quality but it’s a safe techniques (non invasive BCI)
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PRACTICE ASSIGNMENT (1)