A new method of saccadic eye movement detection for optokinetic nystagmus analysis

2012 ◽  
Author(s):  
T. Pander ◽  
R. Czabanski ◽  
T. Przybyla ◽  
J. Jezewski ◽  
D. Pojda-Wilczek ◽  
...  
Keyword(s):  
Eye Movement ◽  
Optokinetic Nystagmus ◽  
New Method ◽  
Saccadic Eye Movement ◽  
Movement Detection ◽  
Nystagmus Analysis

An automatic saccadic eye movement detection in an optokinetic nystagmus signal

2014 ◽  
Vol 59 (6) ◽  
Author(s):  
Tomasz Pander ◽  
Robert Czabański ◽  
Tomasz Przybyła ◽  
Dorota Pojda-Wilczek
Keyword(s):  
Eye Movements ◽  
Optokinetic Nystagmus ◽  
Saccadic Eye Movements ◽  
Medical Applications ◽  
Saccadic Eye Movement ◽  
Robust Methods ◽  
Movement Detection ◽  
Movement Activity ◽  
Detection Function ◽  
Nonlinear Operation

AbstractA saccade is one of the characteristic types of eye movements. The accurate detection and location of saccades in the signal representing the movement activity of the eyes are essential in medical applications. The main purpose of this paper is to present a new, robust approach to the detection of saccadic eye movements. The procedure is based on a so-called detection function, which is the result of the electronystagmographic (ENG) myriad signal filtering, nonlinear operation, and fuzzy median clustering. Smooth peaks of the detection function waveform correspond to the location of saccades in the ENG signal. The median fuzzy clustering-based method allows for calculating the amplitude threshold of the detection function, which improves the accurate saccade recognition. Both of these robust methods provide a two-step protection against outliers. The proposed algorithm was tested using artificial as well as real optokinetic nystagmus signals under different noise conditions. The results show the usefulness of the procedure when the precise detection and location of saccades are necessary.

Visually guided saccade versus eye-hand reach: contrasting neuronal activity in the cortical supplementary and frontal eye fields

1996 ◽  
Vol 75 (5) ◽  
pp. 2187-2191 ◽  
Author(s):  
H. Mushiake ◽  
N. Fujii ◽  
J. Tanji
Keyword(s):  
Eye Movement ◽  
Neuronal Activity ◽  
Motor Task ◽  
Oculomotor Control ◽  
Frontal Eye Field ◽  
Frontal Eye Fields ◽  
Saccadic Eye Movement ◽  
Visually Guided ◽  
Supplementary Eye Field ◽  
Eye Field

1. We studied neuronal activity in the supplementary eye field (SEF) and frontal eye field (FEF) of a monkey during performance of a conditional motor task that required capturing of a target either with a saccadic eye movement (the saccade-only condition) or with an eye-hand reach (the saccade-and-reach condition), according to visual instructions. 2. Among 106 SEF neurons that showed presaccadic activity, more than one-half of them (54%) were active preferentially under the saccade-only condition (n = 12) or under the saccade-and-reach condition (n = 45), while the remaining 49 neurons were equally active in both conditions. 3. By contrast, most (97%) of the 109 neurons in the FEF exhibited approximately equal activity in relation to saccades under the two conditions. 4. The present results suggest the possibility that SEF neurons, at least in part, are involved in signaling whether the motor task is oculomotor or combined eye-arm movements, whereas FEF neurons are mostly related to oculomotor control.

Does frontal normality exist in schizophrenia? A saccadic eye movement study

2001 ◽  
Vol 103 (2-3) ◽  
pp. 167-178 ◽  
Author(s):  
Annelies Broerse ◽  
Esther A.E Holthausen ◽  
Robert J van den Bosch ◽  
Johan A den Boer
Keyword(s):  
Eye Movement ◽  
Saccadic Eye Movement ◽  
Movement Study

Eye movement abnormalities in somatic tinnitus: Fixation, smooth pursuit and optokinetic nystagmus

2010 ◽  
Vol 37 (3) ◽  
pp. 314-321 ◽  
Author(s):  
Z. Kapoula ◽  
Q. Yang ◽  
M. Vernet ◽  
P. Bonfils ◽  
A. Londero
Keyword(s):  
Eye Movement ◽  
Smooth Pursuit ◽  
Optokinetic Nystagmus

scholarly journals A dynamic, imperturbable link between midbrain activity and saccade velocity

2020 ◽  
Vol 123 (2) ◽  
pp. 451-453
Author(s):  
Joshua A. Seideman
Keyword(s):  
Eye Movement ◽  
Strong Evidence ◽  
Neural Control ◽  
Oculomotor Control ◽  
Saccadic Eye Movement ◽  
Saccade Velocity ◽  
Midbrain Structure ◽  
Instantaneous Control ◽  
Dynamic Moment

We make a saccadic eye movement once every few hundred milliseconds; however, the neural control of saccade execution is not fully understood. Dynamic, moment-by-moment variations in saccade velocity are typically thought to be controlled by neurons in the lower, but not the upper regions of the brainstem. In a recent report, Smalianchuk et al. (Smalianchuk I, Jagadisan UK, Gandhi NJ. J Neurosci 38: 10156–10167, 2018) provided strong evidence for a role of the superior colliculus, a midbrain structure, in the instantaneous control of saccade velocity, suggesting the revision of long-standing models of oculomotor control.

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