Stimulus generation function

[CrumpLab]

It would be nice to have helper functions for generating stimuli. For example, a set of stimuli in jsPsych for a Stroop experiment can be defined in an object as follows:

/*defining stimuli*/
var test_stimuli = [
  {
    stimulus: "<p style='color:red;font-size:60pt;'>RED</p>",
    data: { stim_type: 'congruent', response: 'r'}
  },
  {
    stimulus: "<p style='color:blue;font-size:60pt;'>RED</p>",
    data: { stim_type: 'incongruent', response: 'b'}
  },
  {
    stimulus: "<p style='color:green;font-size:60pt;'>RED</p>",
    data: { stim_type: 'incongruent', response: 'g'}
  },
  {
    stimulus: "<p style='color:yellow;font-size:60pt;'>RED</p>",
    data: { stim_type: 'incongruent', response: 'y'}
  }

The above defines 4 individual items, and it takes a bit of copying and pasting to define the remaining combinations.

GOAL

It would be nice to have the stimuli described in table, say tidy format like a dataframe:

html	word	color	congruency
red	red	red	con
green	red	green	inc
blue	blue	yellow	inc

Then, write a function that converts the data.frame to the JS object format.

[CrumpLab]

Deciding to use this thread to think about what I'm doing while doing it...

Something like this defines a data.frame in R that codes aspects of the stimulus set:

stroop_stim <- data.frame( stimuli = length(16),
                           word = rep(c("red","green","blue","yellow"), each=4),
                           color = rep(c("red","green","blue","yellow"), 4),
                           response = rep(c("r","g","b","y"), 4),
                           congruency = length(16)) %>%
  mutate(congruency = as.numeric(word==color)) %>%
  mutate(congruency = recode(congruency, `1` = "Con", `0` = "Inc"))

The stimulus column is empty and needs the appropriate html to define each stimulus. After that, the idea would be to write a function that translates this data frame to a JS object for jsPsych, with stimuli and data attributes.

But, maybe it would be helpful to also write a function that could take a dataframe like this one and generate the necessary html to describe the stimuli. The constructor would do something like, create

snippets and assign styles based on entries in the table...