Limbus Tracking System
Limbus Tracking System - Related Videos
05:55
Multiple Object Tracking
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University In a staggeringly complex and engaging world, it is crucial to selectively process some stimuli at the expense of others. Experimental psychologists call this ability attention. Specifically, visual attention refers to the ability to selectively process aspects of a visual scene. Many paradigms used to study visual attention involve brief, punctuated, and repeated trials. However, everyday situations often place sustained demands...
09:08
High-Resolution Video Tracking of Locomotion in Adult Drosophila Melanogaster
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Cited by 26 •
2009
The study of complex locomotor behavior in Drosophila melanogaster is dependent upon the ability to quantify changes in a given fly's movement. This article demonstrates how to do this using a high-resolution tracking system.
06:19
Eye Tracking in Cognitive Experiments
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2023
Eye tracking as the name suggests involves tracking of eye-movements. It is a non-invasive, sensitive tool that quantifies and measures eye-movements to describe an individuals' cognitive state. An eye-movement between two fixation points is called a saccade, which is one of the fastest motor movements in our body. By observing the profiles of these eye movements, scientists can better understand neural deficits in patients with cognitive impairments. In this video, we will first look at an...
09:03
Eye Tracking Young Children with Autism
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Cited by 93 •
2012
Eye tracking has long been used to study gaze patterns in typically-developing individuals, but recent technological advancements have made its use with clinical populations, including autism, more feasible. While eye-tracking young children with autism can offer insight into early symptom manifestations, it involves methodological challenges. Suggestions for best practices are provided.
07:36
C. elegans Tracking and Behavioral Measurement
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Cited by 14 •
2012
We have developed a video-rate tracking microscope system that can record and quantify C. elegans behavior at high resolution and high speeds. We have also developed computational methods to reduce the dimensionality of the worm images to a fundamental set of measurements that completely describe the shape of the worm.
FAQs
The technique links changes in the limbus signal to eye position by monitoring how reflected infrared light varies as the iris-sclera boundary shifts relative to the sensing system. Photodetectors or cameras capture these changes, and the recorded horizontal and vertical components are converted into estimates of gaze direction. This signal pathway allows eye position to be analyzed alongside behavioral or physiological measurements.
Separating horizontal and vertical components preserves the direction of eye displacement rather than reducing movement to a single measure. That distinction helps investigators characterize different aspects of gaze behavior, including whether a response reflects a change across one axis or coordinated movement across both. In neuroscience, this supports more precise analysis of oculomotor control and visually guided behavior.
High temporal resolution matters because eye movements can be related to rapidly changing sensory and cognitive events. The system can therefore help align measured gaze behavior with neural activity or physiological recordings, allowing investigators to examine when fixation, saccades, or attentional changes occur relative to processing. Its value lies in preserving timing information, not merely indicating final gaze location.
An experiment begins by directing infrared illumination toward the eye and positioning photodetectors or cameras to monitor the limbus relative to the sensor. Changes in reflected light are recorded as the boundary shifts, then translated into horizontal and vertical eye-position estimates. These measurements can be paired with behavioral or physiological observations in the same trial.
Investigators apply limbus tracking when they need objective measurements of fixation, saccades, visual attention, or broader oculomotor control. Because the method produces time-resolved eye-position estimates, it can support experiments that connect gaze behavior with sensory processing and cognition. It is consequently useful in both behavioral studies and physiological neuroscience experiments.
Within neuroscience, the measurements provide a behavioral readout that can be compared with neural or physiological activity. Researchers can ask whether changes in attention or sensory processing coincide with altered fixation or saccadic behavior, while oculomotor analyses describe the associated eye movements. The resulting data connect observable gaze dynamics with underlying cognitive and neural processes.