Information conveyed through brain-control: Cursor versus robot

被引:96
|
作者
Taylor, DM
Tillery, SIH
Schwartz, AB
机构
[1] Arizona State Univ, Dept Bioengn, Tempe, AZ 85287 USA
[2] Inst Neurosci, La Jolla, CA 92121 USA
关键词
brain-computer interface (BCI); brain-machine interface (BMI); information rates; information theory; neural prosthesis; neurocontrollers; prosthetics; robots; virtual reality;
D O I
10.1109/TNSRE.2003.814451
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
Microwire electrode arrays were implanted in the motor and premotor cortical areas of rhesus macaques. The recorded activity was used to control the three-dimensional movements of a virtual cursor and of a robotic arm in real time. The goal was to move the cursor or robot to one of eight targets. Average information conveyed about the intended target was calculated from the observed trajectories at 30-ms intervals throughout the movements. Most of the information about intended target was conveyed within the first second of the movement. For the brain-controlled cursor, the instantaneous information transmission rate was at its maximum at the beginning of each movement (averaged 4.8 to 5.5 bits/s; depending on the calculation method used). However, this instantaneous rate quickly slowed down as the movement progressed and additional information became redundant. Information was conveyed more slowly through the brain-controlled robot due to the dynamics and noise of the robot system. The brain-controlled cursor data was also used to demonstrate a method for optimizing information transmission rate in the case where repeated cursor movements are used to make long strings of sequential choices such as in a typing task.
引用
收藏
页码:195 / 199
页数:5
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