Offline Data Analysis

All ASL 5000 series eye trackers include our 'EYENAL' and 'FIXPLOT' software programs for analyzing and displaying the collected data. This software allows you to do the following:

Display raw data



Reduce data to a list of fixations



A fixation is usually defined as period of at least 100 msec during which point of regard does not change by more than 1-degree visual angle.

Different researchers may have different opinions about the details of this definition (for example, they may want to define minimum fixation duration as somewhat less than 100 msec), and for this reason all parameters in the ASL fixation algorithm are adjustable by the user.

Each fixation in the list has a start time, duration, point of gaze coordinates and average pupil diameter.

Interfix duration is recorded and includes the time and distance between the beginning of a new fixation and the end of the previous fixation.

Specify areas of interest (AOI)

An area of interest is a region of the scene that was viewed by the subject. These regions usually define some object or image component that is meaningful in terms of the research being done.

Match fixations with AOIs

Compute statistics relating fixations to AOIs

	Average amount of times spent viewing each AOI
	Number and duration of fixations in each AOI
	Probabilities of looking from one AOI to another
	Average over multiple subjects or trials
	Compute dwell times

Superimpose plot of fixation "scan path" over image viewed



Display all fixations, any subset of fixations, or step wise sets of fixations (E.g. first 5, then next 5 etc.).

Choose different symbols and colors for fixation indicators and different colors and line types for connecting lines.

Display fixation point symbols with a size proportional to fixation duration.

Superimpose multiple, color coded sets of fixations from different subjects or different trials.

Show areas of interest.

Create bit map files for display in reports or slides.


Batch Capability

Batch multiple subjects for analysis