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The study showed that the DLPFC was equally activated in both saccadic and anti-saccadic movements. Anti-saccades required increased activation of the FEF, SMA and putamen. [2] Currently, the anti-saccade task is currently used as a relatively crude or basic assessment of frontal lobe function in patients with neurological or psychiatric disorders.
Performing smooth pursuit without a moving visual stimulus is difficult, [13] and typically results in a series of saccades. However, pursuit without a visible target is possible under some particular conditions, that show the importance of high-level functions in smooth pursuit maintenance.
Trace of saccades of the human eye on a face while scanning Saccades during observation of a picture on a computer screen. In vision science, 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]
Specifically, saccade abnormalities have been observed in this disorder, with people showing changes in saccade rate, amplitude and accuracy. [25] Such deficits have been linked to medication with lithium, as well as to damage in frontal lobe regions. [25] Further, people with schizophrenia often exhibit errors in smooth pursuit eye movements.
Saccades evaluate voluntary saccadic movement, which are quick eye movements to a target. [1] [2] A dot or visual target appears at random points along the screen, though only along the horizontal axis is common. [2] [1] The patient is instructed to not try to guess where the target will be. [2] This test measures latency, velocity, and accuracy.
After a positive result in the finger-to-nose test, a neurologist will do a magnetic resonance image (MRI) to determine any damage to the cerebellum. [5] Cerebellar patients encounter difficulties to adapt to unexpected changes of the inertia of the limbs. [12] This can be used to increase dysmetria and confirm a diagnosis of cerebellar ...
It consists of a rapid, resetting saccade in the opposite direction of the slow nystagmus (i.e., opposite to the stimulus motion). The purpose of the fast nystagmus is to keep the eye centered in the orbit, while the purpose of the slow nystagmus is to stabilize the moving visual scene on the retina.
A traditional term for "flicker fusion" is "persistence of vision", but this has also been used to describe positive afterimages or motion blur. Although flicker can be detected for many waveforms representing time-variant fluctuations of intensity, it is conventionally, and most easily, studied in terms of sinusoidal modulation of intensity.