SR Research EyeLink Portable Duo User Manual page 38

required if the target and/or eyes are missing or very off-center in the map. For
the thumbnail eye images, the pupil and CR status as well as the threshold
values are displayed. The calibration status and calibration target currently
being presented are indicated at the bottom right of the screen.
To perform a calibration, have the participant look at the first fixation point and
select the 'Accept Fixation' button, or press the ENTER key or the Spacebar, to
start the calibration. For subsequent targets, fixations can be accepted either
automatically by the Host Application, or manually by the experimenter. If the
'Auto Trigger' button is disabled (which will be the case if the 'Calibration
Control' in the Calibration Settings is set to "Manual"), you will need to
manually accept fixation for each of the calibration targets. Pressing the ENTER
key or the Spacebar after accepting the first target will switch from an
automatic calibration to a manual calibration in which case all of the remaining
target fixations will need to be manually accepted. This can be useful for
participants who have difficulty fixating targets or who inappropriately
anticipate new target positions. The 'Backspace' key can be used to undo the
most recently accepted fixation target (e.g., if a participant fixates the wrong
target position or anticipates the new target position). Pressing the backspace
key repeatedly will successively remove acquired fixation data and present the
calibration targets again. This gives the experimenter a chance to intervene
when the acquired samples may be erroneous.
2.4.2.2 Calibration Screen Main Functions
Click to go back to the 'Setup' screen.
Keyboard Shortcut: ESC = 'Setup'
Terminate Calibration sequence.
Keyboard Shortcut: ESC = Abort
Restart the calibration.
Keyboard Shortcut: Delete = Restart
Click to automate the calibration sequencing.
Keyboard Shortcut: A = Auto Trigger
Click to repeat the last calibration target or last few targets.
Keyboard Shortcut: Backspace = Undo last few targets
28 EyeLink Portable Duo Host Software
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