expyriment.io.MarkerOutput

class expyriment.io.MarkerOutput(interface, default_code=None, default_duration=None)

A class implementing a marker output.

Methods

__init__(interface, default_code=None, default_duration=None)

Create a marker output.

If a default code is specified, it will automatically be applied when send() is called without a code. If a default duration is specified, a 0 is sent automatically after the specifed duration when send() is called without a duration.

Parameters :

interface : io.SerialPort or io.ParallelPort

interface to use

default_code : int, optional

default code

default_duration : int, optional

default duration (in ms) for sending 0 after a code

Notes

EEG/MEG systems: If the system is receiving the markers on a parallel port, the duration between sending a code an the subsequent 0 should be at least 1000/samplerate!

default_code

Getter for default_code

default_duration

Getter for default_duration

interface

Getter for interface

send(code=None, duration=None)

Send a marker.

This sends a marker via the specified interface. If a duration is given, a 0 will be sent automatically after each code.

Note for EEG/MEG systems: If the system is receiving the markers on a parallel port, the duration between sending a code an the subsequent 0 should be at least 1000/samplerate!

Parameters :

code : int, optional

a specific code

durartion : int, optional

duration (in ms) for sending a 0 after a code