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cogpsych-study-design
Use when designing the experiments for a Cognitive Psychology (Elsevier) manuscript so they tightly control confounds, discriminate competing models, and have adequate power across a multi-experiment program. Hardens stimulus construction, counterbalancing, design logic, and sample-size justification; it does not write analysis or modeling code.
Cognitive-Psychology-Skills/skills/cogpsych-study-design/SKILL.md
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# Experiment Design (cogpsych-study-design)
Cognitive Psychology expects **tightly controlled cognitive experiments** whose design is engineered to
**discriminate models**, organized as a **multi-experiment program** in which each experiment adds
inference. The craft is in stimulus construction, counterbalancing, confound control, and powering the
*critical contrast* — not just the main effect. Co-design the experiments with the model
(`cogpsych-theory-and-hypotheses`).
## When to trigger
- Designing an experiment or a multi-experiment series
- Constructing stimuli, item sets, and counterbalancing schemes
- A reviewer questioned confounds, power, design logic, or whether the design discriminates the models
- Justifying sample size for the critical contrast (often an interaction)