expyfun.EyelinkController¶

class expyfun.EyelinkController(ec, link='default', fs=1000, verbose=None)[source]¶

Eyelink communication and control methods.

Parameters:

ecinstance of ExperimentController | None: ExperimentController instance to interface with. Necessary for doing calibrations.
linkstr | None: If ‘default’, the default value will be read from EXPYFUN_EYELINK. If None, dummy (simulation) mode will be used. If str, should be the network location of eyelink (e.g., “100.1.1.1”).
fsint: Sample rate to use. Must be one of [250, 500, 1000, 2000].
verbosebool, str, int, or None: If not None, override default verbose level (see expyfun.verbose).

Notes

The data will be saved to the ExperimentController output_dir. If this was None, data will be saved to the current working dir.

calibrate(beep=False, prompt=True)[source]¶

Calibrate the eyetracker

Parameters:

beepbool: If True, beep for each calibration target.
promptbool: If True, a standard screen prompt will be shown.

Returns:

fnamestr | None: Filename on the Eyelink of the started data file.

See also

EyelinkController.custom_calibration
EyelinkController.stop

Notes

At the start of this function, the previous Eyelink file will be closed (if one is open), a new file will be opened, and recording will be started.

custom_calibration(ctype='HV5', horiz=0.6666666666666666, vert=0.6666666666666666, coordinates=None, units='norm')[source]¶

Set Eyetracker to use a custom calibration sequence

Parameters:

ctypestr: Type of calibration. Currently ‘H3’, ‘HV5’, ‘HV9’, and ‘HV13’ are supported. If ‘custom’ coordinates can be directly input.
horizfloat: Horizontal distance (left and right, each) to use.
vertfloat: Vertical distance (up and down, each) to use.
coordinateslist of list of float or int: List of coordinates to use for calibration. Each entry in the list must be a list with 2 elements corresponding to x and y position.
unitsstr: Units to use. See check_units for options.

See also

EyelinkController.calibrate

property eye_used¶

Return the eye used ‘left’ or ‘right’

Returns:

eyestr: ‘left’ or ‘right’.

property file_list¶: The list of files started on the EyeLink

get_eye_position()[source]¶

The current eye position in pixels

Returns:

eye_posarray: The current eye position. Will be [np.inf, np.inf] if the eye is lost.

See also

EyelinkController.wait_for_fix

maintain_fix(fix_pos, check_duration, tol=100.0, period=0.25, check_interval=0.001, units='norm', stop_early=False)[source]¶

Check to see if subject is fixating in a region.

This checks to make sure that the subjects gaze falls within a region at least once in any given period. In other words it checks to make sure that the gaze falls in the target region at least every period seconds.

Parameters:

fix_postuple (length 2): The screen position (in specified units) required.
check_durationfloat: Total amount of time to check.
tolfloat: The tolerance (in pixels) to consider the target hit.
periodfloat: Maximum time between gazes in region
check_intervalfloat: Time to use between position checks (seconds).
unitsstr: Units for fix_pos. See check_units for options.
stop_earlybool: Whether to exit the function when fix_success is False or not.

Returns: