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Trace of saccades of the human eye on a face while scanning Saccades during observation of a picture on a computer screen. A saccade (/ s ə ˈ k ɑː d / sə-KAHD; French:; French for 'jerk') is a quick, simultaneous movement of both eyes between two or more phases of focal points in the same direction. [1]
Conjugate eye movements can be in any direction, and can accompany both saccadic eye movements and smooth pursuit eye movements. [1] Conjugate eye movements are used to change the direction of gaze without changing the depth of gaze. This can be used to either follow a moving object, or change focus entirely.
"Lack of Smooth Pursuit" is a scorable clue on the NHTSA's standardized field sobriety tests. The clue, in combination with others, may be used to determine if a person is impaired by alcohol and/or drugs. Drugs causing lack of smooth pursuit include depressants, some inhalants, and dissociative anesthetics (such as phencyclidine or ketamine).
Primates and many other vertebrates use three types of voluntary eye movement to track objects of interest: smooth pursuit, vergence shifts [1] and saccades. [2] These types of movements appear to be initiated by a small cortical region in the brain's frontal lobe. [3] [4] This is corroborated by removal of the frontal lobe. In this case, the ...
English: The video shows a recording of a participant performing a horizontal smooth pursuit task (5degree amplitude, 0,5Hz). The video was recorded using an infrared video-camera at the Pupils lab for Neuroscience, Tuebingen, Germany.
Eye tracking device is a tool created to help measure eye and head movements. The first devices for tracking eye movement took two main forms: those that relied on a mechanical connection between participant and recording instrument, and those in which light or some other form of electromagnetic energy was directed at the participant's eyes and its reflection measured and recorded.
The frontal eye field is reported to be activated during the initiation of eye movements, such as voluntary saccades [5] and pursuit eye movements. [6] There is also evidence that it plays a role in purely sensory processing and that it belongs to a “fast brain” system through a superior colliculus – medial dorsal nucleus – FEF ...
OKR is typically evoked by presenting full field visual motion to a subject. The optokinetic drum is a common clinic tool used for this purpose. The drum most commonly contains sinusoidal or square-wave stripes that move across the subject's field of view to elicit strong optokinetic eye movements.