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Avotec Arrington Eye Tracker

Avotec camera with Arrington software is available on all scanners but exclusively in BST3 7T Plus and p3. Prisma 1 and Prisma 2 also have access to SR Research EyeLink 1000 Plus.

  • Eye calibration is run on the Arrington PC with the display extended to the projector to present fixation points.
  • Messages are sent from the Task PC to the Arrington PC by network connection.
  • The avotec camera samples at 60Hz

Software for Tasks

The tracker computer communicates over ethernet/network port using Arrington Research software.

  • ViewPointClient_64.exe Viewpoint Client is a software bridge and should launched before the task
  • VPX_InterApp_64.dll provides an API for tasks (EPrime) to talk to ViewPoint, which sends to and optionally recieves data from the tracker commands over the network port.

Example psychopy code in lncdtask's externalcom.py.

Alternatively, tasks can use the undocumented and officially discouraged direct-to-socket communication. See lncdtask's arrington_socket.py or Dr. Jone's Tower Of London

Microsoft Visual C++ Redistributable Packages for Visual Studio 2013 (MSVCP120.dll and MSVCR120.dll) are needed to runViewPointClient_64.exe

P3

p3 has a Real Eye Camera Model RE-5701 box mounted to the scanner. On 2025-10-28 it's (SN 57054) IR illumination component failed and was replaced.