Stabilized images
Encyclopedia
Stabilized Images are images on the retina that are unaffected by microsaccade
or ocular microtremor (OMT). Experiments by Riggs and Ratliff (1950)) established the remarkable finding that stabilized images result in the fading and disappearance of the visual percept. Some think that this demonstrates adaptation
of the sensory retinal cells, but it may have a more profound involvement in the functioning of neural clique
s, cell assemblies (cf. Hebbian theory
) and patterns for memory. Images can be stabilized mechanically with optics mounted on the eye itself, or the eye can be braced mechanically so that its motion is drastically reduced. High contrast luminance gratings stabilized on the retina with a Purkinje images
eyetracker do not disappear completely. This could be due to small errors of stabilization, as small as 8 sec of arc.
Microsaccade
Microsaccades are a kind of fixational eye movement. They are small, jerk-like, involuntary eye movements, similar to miniature versions of voluntary saccades. They typically occur during prolonged visual fixation , not only in humans, but also in animals with foveal vision . Microsaccade...
or ocular microtremor (OMT). Experiments by Riggs and Ratliff (1950)) established the remarkable finding that stabilized images result in the fading and disappearance of the visual percept. Some think that this demonstrates adaptation
Adaptation
An adaptation in biology is a trait with a current functional role in the life history of an organism that is maintained and evolved by means of natural selection. An adaptation refers to both the current state of being adapted and to the dynamic evolutionary process that leads to the adaptation....
of the sensory retinal cells, but it may have a more profound involvement in the functioning of neural clique
Neural clique
Neural cliques, network-level memory coding units in the hippocampus, are functionally organized in a categorical and hierarchical manner. Researchers investigating the role of neural cliques have gained insight into the process of storing memories in the brain...
s, cell assemblies (cf. Hebbian theory
Hebbian theory
Hebbian theory describes a basic mechanism for synaptic plasticity wherein an increase in synaptic efficacy arises from the presynaptic cell's repeated and persistent stimulation of the postsynaptic cell...
) and patterns for memory. Images can be stabilized mechanically with optics mounted on the eye itself, or the eye can be braced mechanically so that its motion is drastically reduced. High contrast luminance gratings stabilized on the retina with a Purkinje images
Purkinje images
Purkinje images are reflections of objects from structure of the eye. They are also known as Purkinje reflexes and as Purkinje-Sanson images. There are at least four Purkinje images that are visible on looking at an eye. The first Purkinje image is the reflection from the outer surface of the cornea...
eyetracker do not disappear completely. This could be due to small errors of stabilization, as small as 8 sec of arc.