Eye Tracking System
Eye Tracking System - Related Videos
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.
09:47
A Method to Quantify Visual Information Processing in Children Using Eye Tracking
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Cited by 41 •
2016
A method is described to quantify the quality of visual information processing based on reflexive eye movements in response to specific visual modalities. Reaction times and fixation output parameters are used to characterize visual performance in children with and without visual impairments from 6 months of age.
07:24
Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
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2025
The methodology explored visual and vestibular contributions to gaze stabilization during optokinetic and whole-body rotations. Stimulations were carried out through visual, vestibular, and visuovestibular trials. Torsional eye-movement gain and nystagmus frequencies served as indicators for the subcortical relay of sensory-specific motion information towards the reflexive brainstem response for each trial.
04:25
Simultaneous Eye Tracking and Single-Neuron Recording to Identify Target-Selective Neurons
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2025
The video demonstrates an assay to identify target-selective neurons via simultaneous eye-tracking and single-neuron recordings. A human participant is tasked with identifying a target object among an array of objects in a display, and the eye movement is tracked. Simultaneously, single neurons' firing rate is recorded via electrodes implanted in the brain. The data from both recordings are correlated to assess the presence of target-selective neurons.
FAQs
Infrared illumination makes the eye’s optical features detectable to cameras. The system identifies the pupil center together with the corneal reflection, then uses their relationship to calculate gaze position. This approach converts visible changes in eye appearance into measurements that can be aligned with visual stimuli, allowing researchers to examine where attention is directed during biological or behavioral experiments.
These measures describe different aspects of visual behavior. Fixations indicate periods when gaze remains relatively focused, whereas saccades are shifts between viewed locations. Pupil changes provide an additional time-varying signal recorded alongside gaze. Examining these measures together helps researchers characterize how an organism samples information and how visual behavior changes during perception, learning, or decision-making tasks.
The spatial location of gaze shows which parts of a stimulus receive visual sampling, while timing indicates the sequence and duration of that sampling. Recording both dimensions allows researchers to study not only what is viewed, but also how visual exploration unfolds over time. This temporal-spatial record supports investigations of visual processing and cognitive behavior.
Eye movements can be studied while participants or organisms encounter natural stimuli or controlled experimental stimuli. Natural material can show how visual sampling occurs in more realistic settings, while experimental stimuli make it possible to examine responses under defined conditions. Interpreting the resulting gaze, fixation, saccade, and pupil measures therefore requires considering the context in which the visual behavior was recorded.
A typical measurement sequence uses infrared cameras to illuminate and image the eye, detects the pupil center and corneal reflection, and applies software to calculate gaze position and related measures. Researchers then record these signals while presenting natural or experimental visual stimuli. The resulting measurements can be examined over time to characterize visual sampling and behavioral responses.
Researchers use eye tracking when they need an indirect measure of visual attention or cognitive behavior during viewing. In biology, it supports studies of visual processing, perception, learning, and decision-making. The same measurement approach also contributes to neuroscience, psychology, human-computer interaction, and clinical assessment, where patterns of gaze and eye movement can provide relevant behavioral evidence.
Eye-tracking experiments can show where visual attention is directed, when gaze changes, and how an organism moves through available visual information. Software-derived measures such as gaze position, fixations, saccades, and pupil changes provide complementary descriptions of that behavior. In biological research, these outcomes help investigators examine how organisms sample information in response to selected stimuli.