User manual

The Plot View displays the x, y data traces as a function of time. The type of

data to be plotted can be configured at the Set Options screen. Since raw data

can also be displayed in the plot view, this view is useful in any data output

mode, even when calibration has not been performed.

2.3.8.2 Record Screen Main Functions (Gaze View and Plot View)

Stops the recording of data to the EDF file.

Keyboard Shortcuts: ESC = Stop Recording

Abort the trial recording.

Keyboard Shortcuts: CTRL + ALT + A = Abort Trial

Instead of showing the gaze cursor, plots the x, y eye data

being acquired as a function of time.

Keyboard Shortcuts: G = toggle between Gaze Cursor and Plot Views

Performs online drift check for data being acquired.

Keyboard Shortcuts: F = perform on-line calibration accuracy check

2.3.8.3 Buttons Used in the Plot View

The top of the Plot View shows the data type being plotted. The “Gaze” option

plots the subject's gaze position in pixel (x, y) display coordinate. The “Angle”

options plots the amount of x, y eye angle in degrees relative to the center of the

screen. The “HREF” plots eye rotation angles relative to the head in HREF

coordinate (see Section 4.4.2.2 “HREF”). The “Raw” option plots the raw (x, y)

coordinate pairs from the camera. The “Analog” option plots the x, y coordinate

in voltages output as done with the analog card output. The top-right lists the

speed of plot (i.e., amount of data being plotted in each screen). For example,

Figure 2-11 illustrates a recording screen with a plotting speed of 6-seconds per

sweep. Each horizontal grid in the plot represents 500-ms worth of data.

The scale used in the plot view is dependent on the data type (Raw, Angle,

HREF, Gaze, or Analog) set in the “Set Options” screen. For example, when

plotting raw eye position, the data are normally within a range between -30000

and +30000. The two purple bands at the top and bottom portions of the

display represent data that is out of normal range.

The visibility of the x and y eye traces can be controlled by the “x-vis” and “y-

vis” buttons under the “show” section at the bottom of the plot.

For calibrated data types (GAZE, HREF, and Angle), the user can change the

layout of the plot by clicking on the “zoom” and “scroll” buttons. The plotting

scale can be changed by clicking on the ⇑ and ⇓ buttons in the “Zoom” section

so that fine details or global patterns of the x, y traces can be viewed. The

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