Looking Forward: Comment on Morgante, Zolfaghari, and Johnson.

Area of Science:

• Developmental Psychology
• Cognitive Neuroscience
• Human-Computer Interaction

Background:

• Eye tracking is crucial for infant research, but timing inconsistencies in devices like the Tobii T60XL raise concerns.
• Previous studies identified timing issues, but the sources and full implications remain unclear.

Purpose of the Study:

• To investigate potential sources of timing inconsistencies in Tobii eye tracker data.
• To assess the impact of these inconsistencies on various infant eye tracking paradigms.
• To provide guidance on the level of concern and corrective actions for researchers.

Main Methods:

• Observations of a Tobii eye tracker were analyzed to identify timing variations.
• The study considered data relevant to infant eye tracking paradigms.
• Potential sources of error were investigated to explain observed inconsistencies.

Main Results:

• Specific sources of timing inconsistencies in Tobii eye trackers were elucidated.
• Timing issues were found to be potentially problematic for event-related looking behavior analysis.
• Observed timing characteristics contraindicate use in rapid gaze-contingent displays (<100 ms).

Conclusions:

• Researchers using eye trackers should be aware of potential timing inconsistencies.
• Corrective measures can mitigate issues, particularly for event-related looking behavior.
• Careful consideration of timing is essential for accurate infant eye tracking data collection.