Search results
Results From The WOW.Com Content Network
Researchers think [weasel words] blinking may help with disengagement of attention; following blink onset, cortical activity decreases in the dorsal network and increases in the default-mode network, associated with internal processing. [2] Blink speed can be affected by elements such as fatigue, eye injury, medication, and disease.
In some cases, it is possible to see flicker at rates beyond 2000 Hz (2 kHz) in the case of high-speed eye movements or object motion, via the "phantom array" effect. [ 16 ] [ 17 ] Fast-moving flickering objects zooming across view (either by object motion, or by eye motion such as rolling eyes), can cause a dotted or multicolored blur instead ...
100–400 milliseconds – the time for the human eye to blink [8] 185 milliseconds – the duration of a full rotation of the main rotor on Bell 205, 212, and 412 helicopters (normal rotor speed is 324 RPM) 200 milliseconds – the time it takes the human brain to recognize emotion in facial expressions; 250 milliseconds – a sixteenth note ...
The average human eye blink takes 350,000 microseconds (just over 1 ⁄ 3 second). The average human finger snap takes 150,000 microseconds (just over 1 ⁄ 7 second). A camera flash illuminates for 1,000 microseconds. Standard camera shutter speed opens the shutter for 4,000 microseconds or 4 milliseconds.
Saccades are one of the fastest movements produced by the human eye (blinks may reach even higher peak velocities).The peak angular speed of the eye during a saccade reaches up to 700°/s in humans for great saccades (25° of visual angle); in some monkeys, peak speed can reach 1000°/s. [6]
The corneal reflex, also known as the blink reflex or eyelid reflex, [1] is an involuntary blinking of the eyelids elicited by stimulation of the cornea (such as by touching or by a foreign body), though it could result from any peripheral stimulus. Stimulation should elicit both a direct and consensual response (response of the opposite eye).
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
The pupil of the human eye can range in size from 2 mm to over 8 mm to adapt to the environment. The human eye can detect a luminance from 10 −6 cd/m 2, or one millionth (0.000001) of a candela per square meter to 10 8 cd/m 2 or one hundred million (100,000,000) candelas per square meter.