眼球運動追蹤系統

Performance

Measurement technique: Video. Detects dark pupil and first Purkinje image

Guaranteed sampling frequency: 60 - 500Hz with no dropped frames

Resolution: Down to 0.05°

Accuracy: 0.25° - 0.5°

Horizontal range: 30°

Allowable head movement: ±20mm

Measurement units: Fick, Helmholtz coordinates in degrees, and screen position in mm or pixels. Uncalibrated raw data is also available for your own custom calibration.

Imaging

Camera type: Digital CMOS sensor with integrated IR illumination

Infrared illumination wavelength: 940nm

Video format: USB3; USB UVC is streamed to the host computer for easy alignment of the Lightning unit and real-time feedback of the participant's Direction of Gaze.

Supplied Software

LiveTrack Viewer for camera alignment, Direction of Gaze calibration, pupil size calibration. Supports data logging to file and real-time plots.

Toolbox for MATLAB

C API

Host System Requirements

USB 2 port

Windows 7 64-bit or later, Mac OS X 10.11 or later, 2015 GNU/Linux distribution or later


EventIDE from Okazolab is the next generation tool for designing advanced behavioural experiments, neuroscientific studies and usability tests.

The guide price includes 3 years of software updates.

EventIDE fully supports our range of LiveTrack eye trackers:

LiveTrack Lightning affordable 500Hz eye tracking

LiveTrack AV for fMRI

LiveTrack FM fixation monitor

 

Real Time Eye Tracking Analysis

• Real-time saccades and fixations detection
• Instant detection of saccade states: start, peak velocity and end
• Online analysis with AOIs, heatmaps, scanpaths
• Online data access
• Eye tracking over desktop and third-party applications
• Object tracking in video
• Export results to data files, images and video
• Templates for standard eye tracking tasks

 





LiveTrack AV for fMRI

Ideal for monitoring fixation at 3T
Creates no scan artefacts from 1.5T up to 9.4T
Is available for monocular and binocular eye tracking
Offers real-time estimates of eye rotation, Direction of Gaze coordinates and pupil size
Has an extremely fast setup time - cameras with an integrated IR illumination source are mounted directly on the head coil close to the eye
Designed to work with BOLDscreen MR Safe LCD displays and rear-projection systems
Includes TTL-compatible trigger input port for data synchronisation
Dedicated eye tracking hardware with USB output that makes integration with your software very easy. Works with Presentation, ePrime, MATLAB, Python and your own custom software
Streams a real-time video feed that allows you to monitor the participant during the scanning sesion
Compatible with Windows, Mac OS X and GNU/Linux

Very fast setup with robust tracking results from close-to-the eye imaging

Keeping the camera close to the eye makes it much easier to align and focus the image. Unlike other vendor's remote camera configurations, our approach provides easy setup and fast calibration, and robust and reliable data with all participants. Simply point the LiveTrack AV camera at the eye, adjust the focus if needed and start recording.

Our MR Safe cameras have an integrated infrared 950nm illumination source. They give the best data when they are positioned behind a dielectric "cold" mirror. Cold mirrors are special optical components that are coated with a dichroic filter that reflects visible light while transmitting infrared wavelengths.

This allows the cameras to be optimally aligned in direct sight of the participant’s eyes, but at the same time hidden behind the mirror outside the participant’s view. The cameras can unobtrusively image each eye using infrared 950nm light through the mirror.

The participant sees the visible light image reflected from the cold mirror, and can therefore view a stimulus display placed outside the magnet bore. Our BOLDscreen MR Safe LCD displays are ideal for this purpose: they can be placed right at the opening of the bore, to give maximum field of view.

Shielded copper cable

The camera uses carefully shielded and filtered circuitry to isolate the video signal from the MR gradients and RF pulses.

Novel Mirror Mounts

A full range of bespoke mounts are available and are highly recommended; they include a cold mirror so that the camera can be positioned completely outside the participant's field of view. This optical design makes the setup for each participant fast and repeatable and provides the optimum optical alignment for robust tracking.

Dedicated image processing

The self-contained LiveTrack AV signal processing unit analyses the video signal and identifies the pupil and corneal reflection. The video image stream, tracked eye position and pupil size data are all returned to the host computer across a high-speed USB2 interface to the stimulus computer.

External trigger input

A separate TTL-compatible signal is recorded with the eye data for easy synchronisation with the stimulus, MR sequence, or any other external equipment.

Example Data

Watch the video below to see some example eye tracking data acquired using the LiveTrack Viewer software utility. The data is calculated by the LiveTrack AV signal processing unit at 60Hz and sent to the computer on USB.