The exemplar interleaving effect in inductive learning: moderation by the difficulty of category discriminations.

Recent research demonstrates a spacing effect in inductive learning. Spacing different individual exemplars apart in time, rather than massing them together, aids in the learning of categories. Experiment 1 examined whether it is interleaving or temporal spacing that is critical to the spacing effect in the situation where the memory load is high, and the results favored interleaving.