logging in or signing up Automized Brain Computer Interface jesudass Download Post to : URL : Related Presentations : Let's Connect Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 2108 Category: Science & Tech.. License: All Rights Reserved Like it (5) Dislike it (1) Added: November 28, 2009 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: 2kaith (35 month(s) ago) plz allow to download Saving..... Post Reply Close Saving..... Edit Comment Close By: Aloosha (35 month(s) ago) plz allow me to download Saving..... Post Reply Close Saving..... Edit Comment Close By: soumya_es (36 month(s) ago) let me download Saving..... 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ANALYSIS MADE WITH A SPECIMEN : ANALYSIS MADE WITH A SPECIMEN The analysis involve arrays of microelectrodes implanted on the primary motor cortex of a monkey . The microelectrodes are implanted to about 2 to 3 millimeters deep into the brain ,tapping 75 to 100 neurons. The activities of the neurons are carefully monitored using software which analyze the waveform and timing of the signals. MONKEY OPERATING A ROBOTIC ARM WITH BRAIN COMPUTER INTERFACING MANUAL CONTROL Vs BRAIN CONTROL : MANUAL CONTROL Vs BRAIN CONTROL During manual control the specimen maneuvers the computer cursor while the analysis records the neuronal activity ,used to create a decoder. Under brain control ,the analysis feed the neuronal signals into the decoder ,which then controls the cursor. The decoder is basically a set of equations that multiply the firing rates of the neurons by certain numbers ,or weights. continues…. : continues…. When the weights have the right values ,the neuronal data can be plugged into the equations and they will spill out the cursor position. Next the scientists immobilized the specimen arm and fed the neuronal signals measured in real time into the decoder. Initially ,the cursor moved spastically. Continues… : Continues… But over a week of practice the performance climbed to nearly 100 percent. For those later session , the specimen didn’t have to undergo any retraining it promptly recalled how to skillfully maneuver the cursor. In predicting the kinetic parameters of limb movements , BCIs predict electrical activity of muscles are being developed which could used to restore mobility in paralyzed limbs by electrically stimulating muscles. When the BMI session began , the neurons quickly locked into a pattern of activity-known as a cortical map-for controlling the cursor. CORTICAL MAP : CORTICAL MAP Cortical map can be stable over time and readily recalled . But they also demonstrated a third characteristics. These cortical maps are robust , resistant to interference . DEMONSTRATION OF CORTICAL MAPPING : DEMONSTRATION OF CORTICAL MAPPING This technique taught the specimen how to use a second decoder. To create the new decoder , they again recorded the neuronal activity while the specimen manually moved the cursor using the exoskeleton arm . The new data sets contained small fluctuations compared with the original one’s, resulting in different weights for the equations. Continues… : Continues… As expected the performance was poor at first , but after just a few days it reached nearly 100 percent . After about just three days , the specimen learned the new decoder. Just as before , practice allowed the neurons to develop a cortical map for the new task. INVASIVE BCI’s : INVASIVE BCI’s The research has targeted repairing damaged sight and providing new functionality to persons with paralysis. Invasive BCI’s are implanted directly into the grey matter of the brain during neurosurgery. As they rest in the grey matter , invasive devices produce the highest quality signals of BCI’s. OSERVATION MADE ON THE SPECIMEN : OSERVATION MADE ON THE SPECIMEN A single array BCI containing 68 electrodes was implanted onto specimens visual cortex and succeeded in producing phosphenes , the sensation of seeing light. The system included cameras mounted on glasses to send signals to the implant. ELECTROCORTICOGRAPHY : ELECTROCORTICOGRAPHY ECoG measures the electrical activity of the brain taken from beneath the skull . The electrodes are embedded in a thin plastic pad that is placed above the cortex , beneath the durra mater. This research indicates that control is rapid , requires minimal training. Thus we conclude by saying that this technique is more useful for physically challenged people. Slide 13: QUERIES..? THANK YOU. : THANK YOU. 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