User manual

sending this as a command in your program. When the subject looks at the

reference position, pressing ‘F9’ key on the Host PC or sending an

“online_dcorr_trigger” command over the link will perform the drift

correction.

Alternatively, an online drift correction can be performed with the aid of a

mouse click. Before recording, add the following line to the FINAL.INI file:

Normal_click_dcorr = ON

Figure 3-20. Performing On-line Drift Correction with

Mouse Click

This will bring up an additional clickable drift correction button in the record

screen. Click on the “Drift Corr” button, which will flash periodically if enabled.

Move the mouse cursor over the intended drift correction target and instruct the

participant to fixate the target precisely. Press the button only once when the

participant fixates stably. The drift correction may fail if there is no stable

fixation data or if there is a large error between the current fixation and the

target item. By default, the maximum acceptable error value (set by the

‘online_dcorr_maxangle’ command) is 5.0°.

3.12 Exiting the Host Application

You can now close the EyeLink 1000 tracker program. Press the key

combination ‘CTRL+ALT+Q’ from any point in the Host PC tracker program to

exit to the command prompt.

An EyeLink 1000 Tutorial: Running an Experiment