47 research outputs found
Neural Representation of Simple Visual Stimuli
No full textTitle: Neural Representation of Simple Visual Stimuli, Author: Thomas Hoeppner, Location: ThodeActivity of individual cells in the
visual cortex of the cat was observed during patterned
stimulation of the retina. Orientation
and illumination of a simple light-dark stimulus
were varied. Cells gave the same response to different
stimuli, suggesting that 'place' theories
of pattern recognition, theories based solely on
'which' cells are responding, are inadequate. It
is suggested that stimuli are represented by the
relative activity across several neurons.ThesisDoctor of Philosophy (PhD
Responsiveness of Neurones in the Visual Cortex of Unanesthetized Cats
No full textTitle: Responsiveness of Neurones in the Visual Cortex of Unanesthetized Cats, Author: Thomas Hoeppner, Location: ThodeAction potentials were recorded from individual neurones in the visual cortex of unanesthetized cats to determine how these neurones respond to visual stimulation. The retina was stimulated by an oscillating light-dark boundary. Very few consecutive
stimulus events are necessary to determine categorically the presence or absence of a response; the summation of the neural activity associated with additional stimulus events is superfluous. No adaptation was observed during sixty seconds of stimulation (180 consecutive stimulus events), although a temporary decline in responsiveness often occurred after the
first response. The number of very short intervals between successive discharges was greatly increased during stimulation.ThesisMaster of Arts (MA
REVIEW OF PIT NUCLEATION, GROWTH AND PITTING CORROSION FATIGUE MECHANISMS
No full textThis paper presents a review of the state of the art developments in the pitting corrosion fatigue of aircraft structural materials. Mechanisms that govern the nucleation and growth of pitting and corrosion fatigue (CF) are briefly addressed. Some of the developments made in the author\u27s laboratories in proposing the fretting induced pit nucleation and growth mechanisms, analysis of the hidden corrosion constituents in fuselage joints and pitting corrosion fatigue crack growth (PCFCG) model are elucidated. An epistemology of the topic is presented which will be of assistance to the community working in this area
The importance of wear and corrosion on the fretting fatigue behavior of two aluminum alloys
No full text
