End experiment if attention check fails

[mtborneo]

Hi! I want to have an attention check/bot check before the experiment starts; is there a way of ending the experiment if they don’t pass the check?

[utkuturk]

Yes, you can store some of the trials answers as a variable, and then have a “gate” trial in which you check the variables and if they fail you show them a message with no visible button and automatically send results within the trial (so you can check if some people did it again). Here’s the code:

PennController.ResetPrefix(null);

var attentionScore = 0;

SendResults("send_results");

Sequence(
    "attn1", "attn2", "attn3", "attn4",
    "gate",
    "welcome", "trials",
    "send_results",
    "end"
);

// --- Attention trials ---
newTrial("attn1",
    newText("attn1-q", "What color is the sky?").print(),
    newButton("attn1-a", "Blue").print(),
    newButton("attn1-b", "Green").print(),
    newSelector("attn1-sel").add(getButton("attn1-a"), getButton("attn1-b")).log().wait(),
    getSelector("attn1-sel").test.selected(getButton("attn1-a"))
        .success(newFunction("attn1-fn", () => { attentionScore += 1; }).call())
);

newTrial("attn2",
    newText("attn2-q", "How many days are in a week?").print(),
    newButton("attn2-a", "7").print(),
    newButton("attn2-b", "5").print(),
    newSelector("attn2-sel").add(getButton("attn2-a"), getButton("attn2-b")).log().wait(),
    getSelector("attn2-sel").test.selected(getButton("attn2-a"))
        .success(newFunction("attn2-fn", () => { attentionScore += 1; }).call())
);

newTrial("attn3",
    newText("attn3-q", "What comes after Tuesday?").print(),
    newButton("attn3-a", "Wednesday").print(),
    newButton("attn3-b", "Monday").print(),
    newSelector("attn3-sel").add(getButton("attn3-a"), getButton("attn3-b")).log().wait(),
    getSelector("attn3-sel").test.selected(getButton("attn3-a"))
        .success(newFunction("attn3-fn", () => { attentionScore += 1; }).call())
);

newTrial("attn4",
    newText("attn4-q", "How many sides does a triangle have?").print(),
    newButton("attn4-a", "3").print(),
    newButton("attn4-b", "4").print(),
    newSelector("attn4-sel").add(getButton("attn4-a"), getButton("attn4-b")).log().wait(),
    getSelector("attn4-sel").test.selected(getButton("attn4-a"))
        .success(newFunction("attn4-fn", () => { attentionScore += 1; }).call())
);

// IMPORTANT TRIAL
newTrial("gate",
    newVar("score").set(() => attentionScore),
    getVar("score").test.is(v => v > 3)
        .failure(
            newText("fail-txt", "Sorry, you did not pass the attention check.").print(),
            // hide send results comment but only here.
            newFunction("silent-send", () => {
                $("<style>.PennController-SendResults { visibility: hidden; height: 0; overflow: hidden; }</style>").appendTo("head");
            }).call(),
            SendResults(), // immediately send results
            newButton().wait() // no visible button to skip or anything
        )
);

// --- Experiment trials ---
newTrial("welcome",
    newText("welcome-txt", "Welcome! Press start to begin.").print(),
    newButton("welcome-btn", "Start").print().wait()
);

newTrial("trials",
    newText("trial-txt", "This is the experiment sentence.").print(),
    newButton("trial-btn", "Next").print().wait()
);

newTrial("end",
    newText("end-txt", "Thank you!").print(),
    newButton("end-btn", "Finish").print().wait()
);

• This reply was modified 1 week, 4 days ago by utkuturk.
• This reply was modified 1 week, 4 days ago by utkuturk.

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