Matt Jaquiery, 2019
A from-scratch implementation of four psychological tasks, for the purpose of replicating Weissman, D. H., Jiang, J., & Egner, T. (2014). Determinants of congruency sequence effects without learning and memory confounds. Journal of Experimental Psychology: Human Perception and Performance, 40(5), 2022-2037.
Four tasks are implemented:
- Flanker task
- Three identical letters either side of a target, presented until response. Identify the target letter.
- Prime-probe task
- Three identical letters in a vertical stack presented for 133ms, 33ms gap, followed by a probe presented for 133ms. Identify the probe.
- Simon task
- Different-coloured squares presented for 250ms in different spatial locations. Identify the square's colour using directional arrow keys.
- Stroop task
- Identify the colour in which a colour-word is printed. Words presented until response.
All the tasks support congruency manipulations, e.g. in a congruent Flanker task the flankers and the target are the same (XXXXXXX), whereas in an incongruent one they are different (XXXSXXX).
Each task uses a split-stimulus approach to eliminate learning and memory confounds with congruency. For each task, odd trials use one stimulus pair (e.g. up/down, or red/blue), while even trials use another (e.g. left/right, or yellow/green).
For more information on the replication, lead by Mate Gyurkovics (Sheffield), with co-authors Bence Palfi (Sussex), Marton Kovacs (Budapest), Balazs Aczel (Budapest), and Matt Jaquiery (Oxford), see the OSF repository.