User manual

Figure 1-1: Typical EyeLink 1000 Configuration (Tower Mount)

All configurations of the EyeLink 1000 operate at the unparalleled low

variability required for accurate gaze contingent paradigms, and the highly

accurate and sensitive operation that careful research demands. EyeLink

systems are the only modern equipment to run on a real-time operating system

for low variability in near-instant access to eye data measures. Although

Remote recording understandably has more noise than recording with a

stabilized head, it nevertheless continues to be highly accurate, though of lower

resolution. Compared to other remote systems on the market, the EyeLink

Remote operates at high acquisition rates meaning fewer missed data points, all

with no moving parts to interfere with stimulus delivery and invalidate the

experimental setting.

A typical EyeLink setup is depicted in Figure 1-1. This figure illustrates

the Tower Mount. The system consists of two computers – one, the Host PC is

dedicated to data collection. The second PC is referred to as the Display PC, and

is generally used for the presentation of stimuli to a participant. The two

computers are connected via an Ethernet link that allows the sharing of critical

information from the Host PC to the Display PC, such as the occurrence of eye

events, or images from the camera. Similarly, the Display PC can communicate

with the Host PC, allowing Display PC applications to direct the collection of

data. An EyeLink button box is attached directly to the Host PC allowing for the

accurate synchronization of participant responses with the eye movement data.

Message passing also allows events collected by I/O devices on the Display PC

(e.g., button boxes, microphones, etc.) to be accurately noted in the data file.

IMPORTANT: Please examine the safety information for the EyeLink 1000

system, found in Section 6.1.

2 Introduction