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These are perhaps not problems unique to RT research. The key message here is that to ensure validity of their measures (i.e., to make accurate interpretations of their results), SLA researchers should be mindful of the psychological processes involved in completing the tasks. While no measure is a pure measure of anything, knowing what is or can be underpinning a numerical result that we interpret is of paramount importance.
前節のパターンと逆で,同じような実験だから過去に自分の実験に参加したことがある人には募集がいかないようにしたいケースです。これは,前節とまったく逆のパターンをすればよいです。スクリーニング設定で”Participation on Prolific”というカテゴリがあり,そこに”Exclude participants from other studies”というサブカテゴリがあるので,それでどの実験に参加している人を除外するかを選択することができます。もちろん,custom allowlistと同じ要領で,”custom blocklist”というのもあるので,任意のIDを参加不可能にすることもできます。
They should check whether a participant has paid attention to the question, not so much to the instructions above it
Questions must not assume prior knowledge
Participants must be explicitly instructed to complete a task in a certain way (e.g. ‘click ‘Strongly disagree’ for this question’), rather than leaving room for mis-interpretation (e.g. ‘Prolific is a clothing brand. Do you agree?’)
They must be easy to read (i.e., should not use small font, or have reduced visibility)
They cannot rely on memory recall
If your study is 5 minutes or longer, then participants must fail at least two checks to be rejected, any shorter studies can use a single failed check to reject