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Nyquist limit
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.
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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
Sets of stimuli which all lead to the same activation of the individual photoreceptor and are thus indiscriminable for that photoreceptor
Nyquist limit
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.
Negative symptoms
Most commonly refers to a group of symptoms characteristic of schizophrenia that include loss of fluency and spontaneity of verbal expression, impaired ability to focus or sustain attention on a particular task, difficulty in initiating or following through on tasks, impaired ability to experience pleasure to form emotional attachment to others, and blunted affect.
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