Gaze point - a point of where a person was looking (a sample of eye-tracking data); webcams usually have a 30Hz sampling rate, which means that for webcam eye-tracking you'll get about 30 gaze points each second.
Fixation - a series of gaze points, that are very close in terms of time and space - user's gaze stops for long enough for a person to focus and process on what this person sees; to determine, whether such a cluster of gazes is a fixation or not, fixation filter parameters need to be defined.
Saccade - the movement of a user’s eyes between fixation points (during which a person doesn't process what he/she sees).
Heatmap - graphical representation of data (density of gaze points) where values are represented as colors.
Recording - a video showing how the tester’s eyes were moving over items during the test - the moving circle appearing on the video represents an area where the tester was looking (gaze point) at this particular moment throughout the duration of the whole test.
AOI - Area Of Interest is an analytical, easy to use tool that allows calculating quantitative eye movement measures; if you draw a boundary around an area of a chosen image that interests you, you'll receive desired metrics:
- average TTFF (Time To First Fixation) - the amount of time that it takes participants (on average) to look at this area for the first time,
- average time spent - the amount of time that participants spent on average looking at this area,
- number of fixations within this area (more fixation means more visual attention),
- ratio - how many of all the viewers (for whom eye-tracking data is collected for the item) saw this area (left at least 1 gaze or fixation within the area);
- average fixation duration - the time that the average fixation lasted for;
- average FFD (first fixation duration) - how long on average lasted the first fixation;
- number of gazes - how many gazes were registered within this AOI;
- average TTFG (time to first gaze) - how long it took the testers on average to first look at this area in seconds (when the first gaze sample was taken),
- average revisits - how many times (on average) participants looked back at this area (looked at it, looked away and then looked back again); AOI visit is detected if there's a fixation within the AOI (or many fixations "one after another"),
- TTFC (Time To First Click) - the amount of time that it takes participants (on average) to click at this area for the first time,
- AOI size - expressed as the percentage value relative to the size of the entire image; it's recommended to make AOIs of at least 5-10% of the item size,
- AOI time range - the time for which the values of the AOI were calculated (you can set this time with the orange slider under the heatmap),
Terms from RealEye pricing
Maximum study time - the total time of all items display, so, for a 10 minutes study time, within one study, it's possible to display i.e. 1 image for 10 minutes or 100 images for 6 seconds each, or 2 images - one for 8 minutes, the second one for 2 minutes, etc.
Data export - the possibility to download collected data in form of CSV files.
Team collaboration - more than one person can be assigned to the same account; team members can work on creating studies/ analyzing data at the same time.
Participant/tester - a person that takes part in the eye-tracking study (opens the participation link) - needs to meet the requirements.