Response is accepted with any key press
Many of the functions within the
trial_ family are designed
to allow participants to respond using a key press, generally by specifying a
choices argument that indicates which keys will be accepted as valid
choices = c("f","j")). There are also cases where
you may wish to allow every key to be a valid response (e.g., in situations
where "Press any key to continue" is a sensible prompt).
In those cases, specifying
choices = respond_any_key() will
produce the desired behaviour.