Otero-Millan et al., "Distinctive features of microsaccades
in Alzheimer's disease and in mild cognitive impairment," AGE, vol.
There are two forms of eye movement: saccades and microsaccades
. (1) In saccade stage, human eyes aim to find candidate object so it makes sharply shifts in the whole field of view.
In addition to the gaze direction and eye-movement pattern, the measurement data of the pupil size and microsaccades
may contribute to the interpretation of the emotional and cognitive status of the user.
During visual fixation, neurons in monkey V1 respond differently to self-generated motion (microsaccades
) than to the equivalent motion in the visual field.
Other movements, such as smooth pursuits, microsaccades
, ocular drifts, and microtremor, are usually ignored, since it is difficult to extract them from the eye-tracking signal, especially when recorded at low sampling rates (below 120 Hz).
Leigh et al., "Simultaneous recordings of human microsaccades
and drifts with a contemporary video eye tracker and the search coil technique," PLoS ONE, vol.
are thought to help avoid adaptation of the principal eyes to nonmoving stimuli, whereas the larger gaze movements often preempt and lead body turns (e.g., C.
It also seems worthwhile to mention 3 other types of eye movements, characterised by high frequency and low amplitude: nystagmus, drifts and microsaccades
. Although analysis of eye movements makes use of the concept of the fixation relative to interrupting eye movement at some point between 2 saccades, in fact the concept is misleading.
Right before the snakes started to move, participants began blinking more and making short jumpy eye movements called microsaccades
, Jorge Otero-Millan, Stephen Macknik and Susana Martinez-Conde report in the April 25 Journal of Neuroscience.
Right before the snakes appeared to move, participants tended to produce blinks, saccades and/or microsaccades
, and right before the snakes stopped, participants' eyes tended to remain stable, researchers including Jorge Otero-Millan, Stephen Macknik and Martinez-Conde reported.
They could be categorized into refixation saccades and microsaccades
, which are seen only during fixation.
Software engineering topics include modeling V1 as a spatial frequency analyzer, the mathematics of image processing with irregularly sampled data, the relationship between super-resolution techniques and the eye movements known as tremor and microsaccades
, eye vergence and depth perception as they pertain to a robotic assisted surgery application, and motion detection algorithms.