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Hemineglect
Hemineglect A condition following damage to the parietal stream of one hemisphere in which individuals are unaware of stimuli from the hemifield that projects to that hemisphere.
RELATED TERMS--------------------------------------
Condition
The term "condition" has a number of biomedical meanings including the following: 1.An unhealthy state, such as in "this is a progressive condition." 2.A state of fitness, such as "getting into condition." 3.Something that is essential to the occurrence of something else; essentially a "precondition." 4.As a verb: to cause a change in something so that a response that was previously associated with a certain stimulus becomes associated with another stimulus; to condition a person, as in behavioral conditioning.
Hemisphere
As applied to the brain, either its left or its right half.
SIMILAR TERMS--------------------------------------
Hemianopia
A loss of one-half of the field of vision; for example, all of the right side of vision is gone. This is sometimes seen in older people with vascular problems, in certain types of brain tumors or after head trauma.
Hemianopsia
Loss of one half of the field of vision (the area that can be seen by each eye when staring straight ahead).
Hemiarthroplasty
Partial joint replacement - in the knee for example.
Hemiparesis
Muscle weakness of one side of the body.
Hemiplegia
Paralysis of one side of the body as a result of injury to neurons carrying signals to muscles from the motor areas of the brain.
Hemisphere
As applied to the brain, either its left or its right half.
PREVIOUS AND NEXT TERMS--------------------------------------
Hymen
A thin membrane that covers the opening of the vagina.
Hysterosalpingogram
A test used to evaluate the health of the uterus and Fallopian tubes in which dye is injected into the uterus and an X-ray is taken. A hysterosalpingogram can locate blockages or tumors that may be correctable with surgery or medication.
Hysteroscopy
A procedure in which a doctor uses an endoscope to examine the health of the uterus.
Half-Wave rectification
A signal which follows only the positive part of a sinusoid and has zero-response to the negative part. Many simple cells show half-wave rectification to contrast reversing patterns.
Haploscopic stimulation
Different stimuli for the two eyes.
Hemineglect
Hollow face illusion
A concave hollow mask of a face viewed from a few feet gives the impression of a normal face. The cognitive interpretation overrides the stereoscopic information.
Horizontal cells
Cells in the retina connected via gap junctions that mediate lateral information transfer over large distances.
Horopter
For a given fixation point, the set of points on the retina that are perceived to have zero retinal disparity. The points sweep out an arc in space that intersects a fixated point in space.
Hue
The perception of color.
Hyperacuity
Psychophysical tasks involving judgements of relative position that are about ten times finer than the separation of bars at the grating acuity limit.
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