Insert reference to a timeline variable
insert_variable(name)
| name | String specifying name of the variable to insert |
|---|
Javascript code that calls the jsPsych.timelineVariable() function
When creating an experiment, a common pattern is to create a
series of trials that are identical in every respect except for one thing
that varies across the trial (e.g., a collection of
trial_html_button_response() trials that are the same except
for the text that is displayed). A natural way to handle this in the
jsPsych framework is to create the trial in the usual fashion, except that
instead of specifying the value that needs to be included in the
trial (e.g., the text itself) the code includes a reference to a
timeline variable. This is the job of the insert_resource()
function. As an example, instead of creating a trial in which
stimulus = "cat" and another one that is identical except that
stimulus = "dog", you could create a "template" for both trials by
setting stimulus = insert_variable("animal"). This acts as a kind
promise that is filled (at runtime) by looking for an "animal" variable
attached to the timeline. See the examples section for an illustration of
how these functions are intended to work together.
# create a template from which a series of trials can be built template <- trial_html_button_response(stimulus = insert_variable("animal")) # create a timeline with three trials, all using the same template # but with a different value for the "animal" variable timeline <- build_timeline(template) %>% set_variables(animal = c("cat", "dog", "pig"))