Cognitive control signals for neural prosthetics
In an embodiment, the invention relates to neural prosthetic devices in which control signals are based on the cognitive activity of the prosthetic user. The control signals may be used to control an array of external devices, such as prosthetics, computer systems, and speech synthesizers. Data obtained from monkeys' movement intentions were recorded, decoded with a computer algorithm, and used to position cursors on a computer screen. Not only the intended goals, but also the value of the reward the animals expected to receive at the end of each trial, were decoded from the recordings. The results indicate that brain activity related to cognitive variables can be a viable source of signals for the control of a cognitive-based neural prosthetic.
Publication number: US2005228515A1 | Search similar patents
Methods for programming a neural prosthesis
This invention relates to methods for programming a neural prosthesis, more particularly to methods for programming a hearing prosthesis, and most particularly to methods for fitting a speech processor and implantable cochlear stimulator by programming the speech processor.
Publication number: EP1599253A2 | Search similar patents
Cognitive state machine for prosthetic systems
A prosthetic system may use a decoder to predict an intended action, such as a reach, from processed signals generated from measured neural activity. The decoder may included a cognitive state machine, which transitions between cognitive states based on transition rules.
Publication number: EP1404259A2 | Search similar patents
Closed loop brain machine interface
A closed loop brain-machine interface is disclosed. The closed loop brain-machine interface translates one or more neural signals into a movement, or a series of movements, performed by a machine. The close-loop brain-machine interface also provides sensory feedback to the subject. Methods of employing the closed loop brain-machine interface are also disclosed.
Publication number: EP1448121A1 | Search similar patents
Neural prosthetic using temporal structure in the local field potential
In an embodiment, neural activity of a subject may be measured with an implant in the sensory motor cortex of the subject and used to predict an intended movement. The measured neural activity may be the local field potential (LFP) at an electrode or single unit (SU) activity. The spectral structure of the LFP and the SU activity may be estimated using spectral analysis techniques. The estimated LFP and SU responses may be used to predict and intended movement by the subject.
Publication number: EP1237473A1 | Search similar patents
Self-anchoring mems intrafascicular neural electrode
The present invention provides a self anchoring electrode for recording, measuring and/or stimulating nerve activity in nerves and/or nerve fascicles of the peripheral nervous system, and methods for using such a self anchoring electrode.
Publication number: WO2009012502A1 | Search similar patents
A method and system for sensory prostheses are disclosed, particularly with respect to implanted auditory prostheses and implanted visual prostheses both of which function as artificial receptors. The method and system are utilized to provide prostheses that use sensory codes which simulate the natural sensory code for recognition and identification which has been found to be the integral of the temporally dispersed receptor signal. Speech recognition is improved by incorporating temporal dispersion into cochlear prostheses and visual pattern reognition is improved by manintaining current levels below those needed for detection.
Publication number: US4611596A | Search similar patents
Systems, methods, and devices for controlling external devices by signals derived directly from the nervous system
A system and method control prostheses and other devices with signals received by sensors implanted directly in the brain or other parts of the nervous system of a subject/patient and transmitted to an external receiver. Included in the system are sensors in the form of bundles of small, insulated, flexible wires, configured in a parallel or twisted array, which are used to receive multicellular signals from small clusters of neurons. A new �calibration/adaptation� system is developed, in which the neural signals are cross-correlated with the parameters of a set of standardized or model movements as the subject/patient attempts to emulate the model movements, and on the basis of the correlations the neural signals that are best suited for control of the corresponding movement or movement parameter of the external device are selected. Periodic use of this calibration system compensates for or adapts to uncontrolled changes in neural signal parameters over time, and therefore results in re-selection of the optimal neural channels for better device control. Artificial neural nets are used for mapping the selected neural signals onto appropriate movements or control parameters of the external device.
Publication number: WO0009008A1 | Search similar patents
Human cerebral cortex neural prosthetic
A neural prosthetic device for a primary auditory cortex of a patient includes a speech processor for receiving and processing audio information and for outputting processed electrical signals and a support arranged in said primary auditory cortex having a plurality of electrical contacts. The support is arranged in the patient's primary auditory cortex and each of the plurality of electrical contacts independently outputs electrical discharges in accordance with the processed electrical signals. The plurality of electrical contacts are arranged to approximately tonotopically match the primary auditory cortex.
Publication number: US5496369A | Search similar patents
Wireless prosthetic electrode for the brain
A wireless neural prosthetic device for a primary auditory cortex of a patient includes either a speech processor or a stimulating device for receiving and processing information and a wireless electrode arranged in the primary auditory cortex having a plurality of electrical contacts. The electrode can be arranged in the patient's primary auditory cortex and each of the plurality of electrical contacts independently outputs electrical discharges in accordance with the processed electrical signals. The plurality of electrical contacts can be arranged to approximately tonotopically match the primary auditory cortex.This application is a continuation-in-part of U.S. patent application Ser. No. 08/194,017 filed Feb. 9, 1994, now U.S. Pat. No. 5,496,369, the contents of which are incorporated herein by reference.
Publication number: US5800535A | Search similar patents
Apparatus and method for visual stimulation indication
Methods and devices for verifying that proper visual stimulation is applied to the visual prostheses are described. In one of the methods, a retinal stimulation system implanted on a subject is simulated externally. An external testing device is also discussed.
Publication number: US2008021688A1 | Search similar patents
A method of training a biological neural network using a controller, comprising: applying a cycle comprising: stimulating a neural network by said controller applying at least an input signal to the network; detecting an output response of the network by said controller; and modifying said stimulation by said controller for at least a period of time if said response matches a desired at least approximate response; and repeating said cycle of stimulation, detection and modification at least one more time until said neural network is trained to generate a desired output response for said input signal.
Publication number: WO02073526A2 | Search similar patents
Prosthetic devices and methods and systems related thereto
Prosthetic devices, methods and systems are disclosed. Eye position and/or neural activity of a primate are recorded and combined. The combination signal is compared with a predetermined signal. The result of the comparison step is used to actuate the prosthetic device.
Publication number: US2006217816A1 | Search similar patents
Flexible circuit electrode array
Polymer materials are useful as electrode array bodies for neural stimulation. They are particularly useful for retinal stimulation to create artificial vision, cochlear stimulation to create artificial hearing, or cortical stimulation many purposes. The pressure applied against the retina, or other neural tissue, by an electrode array is critical. Too little pressure causes increased electrical resistance, along with electric field dispersion. Too much pressure may block blood flow. Common flexible circuit fabrication techniques generally require that a flexible circuit electrode array be made flat. Since neural tissue is almost never flat, a flat array will necessarily apply uneven pressure. Further, the edges of a flexible circuit polymer array may be sharp and cut the delicate neural tissue. By applying the right amount of heat to a completed array, a curve can be induced. With a thermoplastic polymer it may be further advantageous to repeatedly heat the flexible circuit in multiple molds, each with a decreasing radius. Further, it is advantageous to add material along the edges. It is further advantageous to provide a fold or twist in the flexible circuit array. Additional material may be added inside and outside the fold to promote a good seal with tissue.
Publication number: EP1874397A2 | Search similar patents
Test methods for cochlear implant stimulation strategies
An arrangement and method for hearing implant signal processing is described. A hearing implant signal processor converts a speech signal input into multi-channel electrical stimulation signals for a cochlear implant electrode array. A feature adjustment module adjusts feature resolution of the electrical stimulation signals to produce a corresponding sequence of cochlear stimulation feature vectors. A speech recognition vector pre-processor maps the cochlear stimulation feature vectors into corresponding speech recognition feature vectors. A speech recognition engine evaluates the speech recognition features vectors with probabilistic state sequence models to produce speech recognition outputs corresponding to the speech signal input.
Publication number: WO2013009805A1 | Search similar patents