Author Archives: Joe Roushar
About Joe Roushar
Former spy, current enterprise systems architect and entrpreneur, camper, canoeist, musician, grandparent, inventor. About Joe Roushar
Former spy, current enterprise systems architect and entrpreneur, camper, canoeist, musician, grandparent, inventor. About Joe Roushar
Former spy, current enterprise systems architect and entrpreneur, camper, canoeist, musician, grandparent, inventor. About Joe Roushar
Former spy, current enterprise systems architect and entrpreneur, camper, canoeist, musician, grandparent, inventor. About Joe Roushar
Former spy, current enterprise systems architect and entrpreneur, camper, canoeist, musician, grandparent, inventor. About Joe Roushar
Former spy, current enterprise systems architect and entrpreneur, camper, canoeist, musician, grandparent, inventor. About Joe Roushar
Former spy, current enterprise systems architect and entrpreneur, camper, canoeist, musician, grandparent, inventor. About Joe Roushar
Former spy, current enterprise systems architect and entrpreneur, camper, canoeist, musician, grandparent, inventor. About Joe Roushar
Former spy, current enterprise systems architect and entrpreneur, camper, canoeist, musician, grandparent, inventor. About Joe Roushar
Former spy, current enterprise systems architect and entrpreneur, camper, canoeist, musician, grandparent, inventor.11 Jan The Pedantic Querulous Shrinking Violet
How much do you know about a person when you first meet them? What can you learn from speaking with them, even through an hour-long interview? Are first impressions valid in any way? Socially, we understand that it takes a variety of experiences in different contexts to really get to know a person, yet our ability […]
10 Jan Shades of Meaning
I have been sharing my observations on the electrical behavior of the brain this month, with a brief glance at perspectives on perception. My work began, and may end with language. As my springboard into artificial intelligence, I’ve been trying for years to develop computer programs that can understand your intent and use that understanding […]
09 Jan What of Perception
Questions Cognitive Modelers Might Ask The biological and chemical processes associated with brain activity are the foundation on which our exploration of the cognitive mind is built. Yet the physiological underpinnings are not sufficient, in themselves, to lead us to the next cybernetic level. Too many questions are left unanswered. In this section of Understanding […]
08 Jan E/I Electric Potential Curve
Challenge I’ve noticed two phenomena in computing that have often been compared to brain activity even though they don’t significantly resemble the behavior of electrical potential changes between neurons: Flip-Flop (the changing of a “register” from 0 to 1 Node Firing (The activation of a node in an artificial neural network) In this section of Understanding Context, I’ve been trying to […]
06 Jan Excitation and Inhibition
Most, if not all, neural information-processing functions involve the flow of action potential. Impulses in the nervous system are changes in the action potential or electrical charge of membranes. It is possible that, in addition to the membranes, the potential within the cytoplasm of the cell changes as a result of electrical flow in neurons. […]
03 Jan Synapses and Neurotransmitters
Synapse Structure Electrical impulses are transmitted between neurons either electrically or chemically, with chemical synapses being the most numerous by far. The synapse is where electrical transduction between neurons occurs, facilitating perception, thought and action. The gap between a synapse and its target is called the synaptic cleft (tagged in the center right of the illustration and […]
02 Jan Synapse Formation
Many neurons have only a few synapses. Others, like giant pyramidal and Purkinje cells, may have tens or even hundreds of thousands of synapses. At the conclusion of the complex growth process, called synaptogenesis, in which growth cones at the tips of spines, axons, and dendrites propel or draw the fiber through the crowded gray and white matter […]
01 Jan Axon and Dendrite Growth
Link Formation in a Bio-Network It was once believed that the link structure of the nervous system was formed randomly during embryogenesis and remained static after maturation – sometime between early development and adolescence (except for regeneration after injury). Due to improved imaging resolutions and preparation techniques, we now know that axon termini, dendrites, and spines […]
31 Dec Signal Transduction in Neurons
Wires in the Brain Electrical impulses jump from neuron to neuron in the brain through their branching nerve fibers. This movement of electrical potentials is called signal transduction, and significantly resembles the process of electrical flow in printed circuit boards and semiconductor chips. Nerve fibers (axons and dendrites) are filled with a fluid called axoplasm. […]
30 Dec Aristotle and von Neumann
In the 1950’s, John von Neumann compared the computer to the brain. Scientific inquiry that laid the foundation for that comparison, however, had begun long before. The influence of the Greek philosopher Aristotle’s association theory (metaphysics), for example, is evident in neural net theory. In The Computer and the Brain, Dr. von Neumann describes how […]