Keyboard Component

The Keyboard component can be used to collect responses from a participant.

By not storing the key press and checking the forceEndTrial box it can be used simply to end a Routine

Categories:

Responses

Works in:

PsychoPy, PsychoJS

Parameters

Basic

Name

Everything in a PsychoPy® experiment needs a unique name. The name should contain only letters, numbers and underscores (no punctuation marks or spaces).

Start

The time that the keyboard should first get checked. See Defining the onset/duration of components for details.

Stop

When the keyboard is no longer checked. See Defining the onset/duration of components for details.

Register keypress on…

When should the keypress be registered? As soon as pressed, or when released?

Options: - press - release

Allowed keys

A list of allowed keys can be specified here, e.g. [‘m’,’z’,’1’,’2’], or the name of a variable holding such a list. If this box is left blank then any key that is pressed will be read. Only allowed keys count as having been pressed; any other key will not be stored and will not force the end of the Routine. Note that key names (even for number keys) should be given in single quotes, separated by commas. Cursor control keys can be accessed with ‘up’, ‘down’, and so on; the space bar is ‘space’. To find other special keys, run the Coder Input demo, “what_key.py”, press the key, and check the Coder output window.

Force end of Routine

If this box is checked then the Routine will end as soon as one of the allowed keys is pressed.

Data

What information to save, how to lay it out and when to save it.

Store

Which key press, if any, should be stored; the first to be pressed, the last to be pressed or all that have been pressed. If the key press is to force the end of the trial then this setting is unlikely to be necessary, unless two keys happen to be pressed in the same video frame. The response time will also be stored if a keypress is recorded. This time will be taken from the start of keyboard checking (e.g. if the keyboard was initiated 2 seconds into the trial and a key was pressed 3.2s into the trials the response time will be recorded as 1.2s).

Options: - last key - first key - all keys - nothing

Discard previous

Check this box to ensure that only key presses that occur during this keyboard checking period are used. If this box is not checked a keyboard press that has occurred before the start of the checking period will be interpreted as the first keyboard press. For most experiments this box should be checked.

Store correct

Check this box if you wish to store whether or not this key press was correct. If so then fill in the next box that defines what would constitute a correct answer e.g. left, 1 or $corrAns (note this should not be in inverted commas). This is given as Python code that should return True (1) or False (0). Often this correct answer will be defined in the settings of the Loops.

Correct answer

What is the ‘correct’ key? Might be helpful to add a correctAns column and use $correctAns to compare to the key press.

Device

Device label

A label to refer to this Component’s associated hardware device by. If using the same device for multiple components, be sure to use the same label here.

Testing

Disable Component

Disable this Component

See also

API reference for psychopy.event


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