Dictionary » A » Amplitude



1. State of being ample; extent of surface or space; largeness of dimensions; size. The cathedral of Lincoln . . . Is a magnificent structure, proportionable to the amplitude of the diocese. (Fuller)

2. Largeness, in a figurative sense; breadth; abundance; fullness. Of extent of capacity or intellectual powers. Amplitude of mind. . Amplitude of comprehension. .

Of extent of means or resources. Amplitude of reward. .

3. (Science: astronomy) The arc of the horizon between the true east or west point and the center of the sun, or a star, at its rising or setting. At the rising, the amplitude is eastern or ortive: at the setting, it is western, occiduous, or occasive. It is also northern or southern, when north or south of the equator. The arc of the horizon between the true east or west point and the foot of the vertical circle passing through any star or object.

4. The horizontal line which measures the distance to which a projectile is thrown; the range.

5. (Science: physics) The extent of a movement measured from the starting point or position of equilibrium; applied especially to vibratory movements.

6. (Science: mathematics) An angle upon which the value of some function depends; a term used more especially in connection with elliptic functions. Magnetic amplitude, the angular distance of a heavenly body, when on the horizon, from the magnetic east or west point as indicated by the compass. The difference between the magnetic and the true or astronomical amplitude (see 3 above) is the variation of the compass.

Origin: L. Amplitudo, fr. Amplus: cf. F. Amplitude. See ample.

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Re: Sound and how the brain reacts to it

... performed new in vitro experiments on individual hair bundles from a bullfrog auditory system. Unlike previous observations that focused on the amplitude response, the team recorded the phase of spontaneous oscillations as the bundles were stimulated with a vibrating glass fiber. High-speed ...

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by GremlinGnome422
Mon Jul 01, 2013 7:25 pm
Forum: Human Biology
Topic: Sound and how the brain reacts to it
Replies: 89
Views: 175718

Re: sensory question

I've been away from this for awhile, but my answer to your dilemma is that the action potential has many components. It's amplitude is normally a constant or varies little, but the refractory period may vary. I suspect the refractory period (time from stimulation to membrane recovery ...

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by RLBallantyne
Tue Jun 19, 2012 10:14 pm
Forum: Cell Biology
Topic: sensory question
Replies: 2
Views: 3270

Effect of low temperature on smooth muscle

... for smooth muscle going into some sort of spasm after initial contact with cold water before resuming contraction albeit at a lower frequency and amplitude. Can anyone point me to some paper or explanation! Thanks!

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by mitchrapp2000
Thu May 03, 2012 5:13 pm
Forum: Physiology
Topic: Effect of low temperature on smooth muscle
Replies: 0
Views: 2580

Action Potential

Hello, If the density of K+ channels in the axon was increased by 50%, which of the following statements would be true? 1. The amplitude of the action potential would be reduced by 50% 2. The falling phase would be more steep 3. The falling phase would have a steeper slope 4. The amplitude ...

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by sugars888
Thu Sep 29, 2011 5:12 am
Forum: Physiology
Topic: Action Potential
Replies: 5
Views: 7754

Re: Homeostasis and cells

... on spike timing are amplified with decreasing synaptic input slope and increased cell susceptibility (millivolt membrane polarization per field amplitude). We confirmed these predictions experimentally using CA1 hippocampal neurons in vitro exposed to static (direct current) and oscillating ...

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by seekeroftruth
Sat Dec 18, 2010 10:54 am
Forum: Cell Biology
Topic: Homeostasis and cells
Replies: 12
Views: 8867
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