— A neural synapse circuit design is presented here. The circuit models the result of an action potential applied to a biological synapse, including neurotransmitter action, membrane potentials, and ion pumps. The output of the circuit is an Ex-citatory PostSynaptic Potential (EPSP). The circuit is simulated using carbon nanotube SPICE models.
—A neural dendritic computational circuit design is presented here. The circuit models the result of action potentials applied to biological synapses on a portion of a dendritic tree. The resultant excitatory post synaptic potentials (EPSPs) are combined in a dendritic tree that demonstrates linear, superlinear and sublinear summation of both spatially and… (More)
Neuromorphic circuits are designed and simulated to emulate the role of astrocytes in phase synchronization of neuronal activity. We emulate, to a first order, the ability of slow inward currents (SICs) evoked by the astrocyte, acting on extrasynaptic N-methyl-D-aspartate receptors (NMDAR) of adjacent neurons, as a mechanism for phase synchronization. We… (More)
—The design of a cortical neuron with carbon nan-otube circuit elements that performs nonlinear dendritic computations with excitatory and inhibitory post-synaptic potentials is presented. The inhibitory synapse with controllable parameters that implement plasticity is described in detail. The circuit design was simulated using carbon nanotube spice models.… (More)
—Detecting moving objects in a moving background or a dynamic scene is essential to the survival of some animals. The circuitry computing differential motion is found in the biological retina. An object-motion-sensitivity (OMS) ganglion cell remains silent under global motion of the entire image but fires when the image patch in its receptive field moves… (More)
This paper describes a carbon nanotube synapse circuit that exhibits Spike-Timing Dependant Plasticity (STDP). These synapses are found in cortical (e.g. pyramidal) neurons. Experiments with the synapse in a neuron circuit demonstrate changes in synaptic potential with pre- and post-spiking timing variations. The circuit design is biomimetic and changes in… (More)
—This paper describes an analog tunable carbon nanotube axon hillock that exhibits spiking with control over spiking frequency and spiking duration. Experiments with the axon hillock circuit embedded in a neuron circuit demonstrate spiking patterns similar to a biological fast-spiking neuron. The circuit design is biomimetic and changes in control voltages… (More)
Mycobacterium avium is an environmental microorganism that is adapted to live both in the environment (mainly in water and soil) and in bird, fish and mammal hosts. In humans, M. avium infection is seen in patients with some sort of immunosuppression, such as patients with chronic lung disease, and Acquired Immunodeficiency Syndrome. More recently, other… (More)