|
 |
||
 |
| This glossary contains: 19186 medical terms |
 |
Null sets
|
|
Null sets Sets of stimuli which all lead to the same activation of the individual photoreceptor and are thus indiscriminable for that photoreceptor
RELATED TERMS--------------------------------------
Photoreceptor
A light sensitive neuron. Photoreceptors interact with light which produces changes in their electrical properties which are communicated to other neurons. They constitute the first stage in the physiological process which underlies vision. The human retina, like the retina of most vertebrates, contains two broad classes of photo-receptors, rods and cones.
SIMILAR TERMS--------------------------------------
Null cells
An early population of lymphocytes bearing neither T-cell nor B-cell differentiation antigens.
PREVIOUS AND NEXT TERMS--------------------------------------
Norplant
Time-released birth control, administered through 6 tiny tubes that are implanted in a woman's upper arm. It remains effective for up 5 years.
Nasal hemiretina
That portion of the retina that lies medial to the fovea.
Neuron doctrine
The idea that nerve cells are independent biological units.
Nonclassical receptive field
Classical receptive fields are plotted by spots of light or moving stimuli. If a cell responds consistently to that stimulus then the location of that stimulus is said to be within the cells classical receptive field. Activity outside that area can influence a cell's response to the original stimulus. Examples : Motion, Color.
Nucleus of the optic tract (NOT)
Receives input from directionally sensitive cells in the retina. Lesions produce deficits in tracking of moving stimuli.
Null sets
Nyquist limit
The highest resolvable frequency that can be unambiguously registered by an array of neural elements. A system that encodes spatial patterns at a seires of uniformly spaced sample points can exactly represent sine or cosine gratings of all spacial frequencies up to the Nyquist frequency.
Necropsy
Examination of a body after death.
Nephrectomy
Surgical removal of the kidney.
Nephropathy
Any disease of the kidney.
Nephropyelitis
Inflammation of the kidney and renal pelvis often by ascending bacterial infection.
RELATED TERMS--------------------------------------
Photoreceptor
A light sensitive neuron. Photoreceptors interact with light which produces changes in their electrical properties which are communicated to other neurons. They constitute the first stage in the physiological process which underlies vision. The human retina, like the retina of most vertebrates, contains two broad classes of photo-receptors, rods and cones.
SIMILAR TERMS--------------------------------------
Null cells
An early population of lymphocytes bearing neither T-cell nor B-cell differentiation antigens.
PREVIOUS AND NEXT TERMS--------------------------------------
Norplant
Time-released birth control, administered through 6 tiny tubes that are implanted in a woman's upper arm. It remains effective for up 5 years.
Nasal hemiretina
That portion of the retina that lies medial to the fovea.
Neuron doctrine
The idea that nerve cells are independent biological units.
Nonclassical receptive field
Classical receptive fields are plotted by spots of light or moving stimuli. If a cell responds consistently to that stimulus then the location of that stimulus is said to be within the cells classical receptive field. Activity outside that area can influence a cell's response to the original stimulus. Examples : Motion, Color.
Nucleus of the optic tract (NOT)
Receives input from directionally sensitive cells in the retina. Lesions produce deficits in tracking of moving stimuli.
Null sets
Nyquist limit
The highest resolvable frequency that can be unambiguously registered by an array of neural elements. A system that encodes spatial patterns at a seires of uniformly spaced sample points can exactly represent sine or cosine gratings of all spacial frequencies up to the Nyquist frequency.
Necropsy
Examination of a body after death.
Nephrectomy
Surgical removal of the kidney.
Nephropathy
Any disease of the kidney.
Nephropyelitis
Inflammation of the kidney and renal pelvis often by ascending bacterial infection.
We thank you for using the Medical Glossary to search for Null sets. If you have a better definition for Null sets than the one presented here, please let us know by making use of the suggest a term option. This definition of Null sets may be disputed by other professionals. Our attempt is to provide easy definitions on Null sets and any other medical topic for the public at large.
This dictionary contains 19186 terms.
|
|