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A reflexive saccade is triggered exogenously by the appearance of a peripheral stimulus, or by the disappearance of a fixation stimulus. A scanning saccade is triggered endogenously for the purpose of exploring the visual environment. In an antisaccade, the eyes move away from the visual onset. They are more delayed than visually guided ...
It is also referred to as saccadomania or reflexive saccade. The movements of opsoclonus may have a very small amplitude, appearing as tiny deviations from primary position. Possible causes of opsoclonus include neuroblastoma and encephalitis in children, and breast, lung, or ovarian cancer in adults.
The anti-saccade (AS) task is a way of measuring how well the frontal lobe of the brain can control the reflexive saccade, or eye movement. [1] Saccadic eye movement is primarily controlled by the frontal cortex .
McConkie's and Currie's saccade target theory [1] is similar to research by Schneider who came up with a similar "reference object theory". [2] Both theories hypothesize that each saccade is preceded by processes in the visual system that chose an object as the target for the next fixation point. The object is usually located in peripheral ...
During each saccade the eyes move as fast as they can and the speed cannot be consciously controlled in between the fixations. [11] Each movement is worth a few minutes of arc, at regular intervals about three to four per second. One of the main uses for saccades is to scan a greater area with the high-resolution fovea of the eye. [13]
A microsaccade, also known as a "flick", is a type of saccade. Microsaccades are the largest and fastest of the fixational eye movements. Like saccades in general, microsaccades are usually binocular, and conjugate movements with comparable amplitudes and directions in both eyes.
Attention is therefore externally guided by a stimulus, resulting in a reflexive saccade. Endogenous orienting is the voluntary movement that occurs in order for one to focus visual attention on a goal-driven stimulus. [28] Thus, the focus of attention of the perceiver can be manipulated by the demands of a task.
This method was used in the first, 1995, experiment. A change is made in an image at the same time as the image is moved in an unpredictable direction, forcing a saccade. This method mimics eye movements and can detect change blindness without introducing blank screens, masking stimuli or mudsplashes. [10]