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A reflex action, also known as a reflex, is an involuntary and nearly instantaneous movement in response to a stimulus. A true reflex is a behavior which is mediated via the reflex arc; this does not apply to casual uses of the term 'reflex'.
In animals, reaction time to visual stimuli is typically 150 to 300 milliseconds.
While the reflexes above are stimulated mechanically, the term H-reflex refers to the analogous reflex stimulated electrically, and Tonic vibration reflex for those stimulated by vibration...
{|class="wikitable" |Grade || Description |- | 0 || Absent |- | 1+ or + || Hypoactive |- | 2+ or ++ || "Normal" |- | 3+ or +++ || Hyperactive without clonus |- | 4+ or ++++ || Hyperactive with clonus |}
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