Editing Saccade (section)

==Vision==
===Saccadic masking===
{{Main|Saccadic masking}} 
It is a common but false belief that during the saccade, no information is passed through the optic nerve to the brain. Whereas low spatial frequencies (the 'fuzzier' parts) are attenuated, higher spatial frequencies (an image's fine details) that would otherwise be blurred by the eye movement remain unaffected.  This phenomenon, known as ''saccadic masking'' or ''saccadic suppression'', is known to begin prior to saccadic eye movements in every primate species studied, implying neurological reasons for the effect rather than simply the image's motion blur.<ref>{{cite journal |doi=10.1523/JNEUROSCI.3950-08.2008 |doi-access=free |title=Saccadic Modulation of Neural Responses: Possible Roles in Saccadic Suppression, Enhancement, and Time Compression |year=2008 |last1=Ibbotson |first1=M. R. |last2=Crowder |first2=N. A. |last3=Cloherty |first3=S. L. |last4=Price |first4=N. S. C. |last5=Mustari |first5=M. J. |journal=Journal of Neuroscience |volume=28 |issue=43 |pages=10952–60 |pmid=18945903|pmc=6671356 }}</ref>  This phenomenon leads to the so-called stopped-clock illusion, or [[chronostasis]].

A person may observe the saccadic masking effect by standing in front of a mirror and looking from one eye to the next (and vice versa).  The subject will not experience any movement of the eyes or any evidence that the optic nerve has momentarily ceased transmitting. Due to saccadic masking, the eye/brain system not only hides the eye movements from the individual but also hides the evidence that anything has been hidden. Of course, a second observer watching the experiment will see the subject's eyes moving back and forth. The function's main purpose is to prevent an otherwise significant smearing of the image.<ref name="eb"/> (You can experience your eye saccade movements by using your cellphone's front-facing camera as a mirror, hold the cellphone screen a couple of inches away from your face as you saccade from one eye to the other—the cellphone's signal processing delay allows you to see the end of the saccade movement.)

===Spatial updating===
When a visual stimulus is seen before a saccade, subjects are still able to make another saccade back to that image, even if it is no longer visible. This shows that the brain is somehow able to take into account the intervening eye movement. It is thought that the brain does this by temporarily recording a copy of the command for the eye movement, and comparing this to the remembered image of the target. This is called spatial updating. Neurophysiologists, having recorded from cortical areas for saccades during spatial updating, have found that memory-related signals get remapped during each saccade.{{Citation needed|date=October 2016}}

===Trans-saccadic perception===
It is also thought that perceptual memory is updated during saccades so that information gathered across fixations can be compared and synthesized. However, the entire visual image is not updated during each saccade. Some scientists believe that this is the same as visual working memory, but as in spatial updating the eye movement has to be accounted for. The process of retaining information across a saccade is called trans-saccadic memory, and the process of integrating information from more than one fixation is called trans-saccadic integration.