In a Mechanical Turk flashcard experiment, raising the new-item arrival rate first increases mastered items, but past the optimum fewer items are mastered and more get stuck in deck 1.¶

Claim · All claims
Evidence · 1 study (2 entries) · causal r? · q2
Currency · newest study 2016 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? As arrival rate increased, the number of mastered items first increased. → Reddy 2016 q2 i? Past the optimum arrival rate, relatively fewer items were mastered and relatively more items got stuck in deck 1. → Reddy 2016 (2)

Evidence¶

Reddy 2016¶

Reddy, S., Labutov, I., Banerjee, S., & Joachims, T. (2016). Unbounded Human Learning: Optimal Scheduling for Spaced Repetition. KDD ’16, San Francisco, CA, USA. https://doi.org/10.1145/2939672.2939850

q2 · i? · causal · r?

Mechanical Turk experiment: average distribution of items across decks at session end, by arrival-rate condition (Fig. 15). "as the arrival rate increases, we first see an increase in the number of mastered items"; descriptive counts, no test reported.

"Fig. 15 illustrates the same phase transition observed earlier: as the arrival rate increases, we first see an increase in the number of mastered items."

Reddy 2016 (2)¶

Reddy, S., Labutov, I., Banerjee, S., & Joachims, T. (2016). Unbounded Human Learning: Optimal Scheduling for Spaced Repetition. KDD ’16, San Francisco, CA, USA. https://doi.org/10.1145/2939672.2939850

q2 · i? · causal · r?

Same Mechanical Turk experiment and deck-distribution analysis (Fig. 15). Past the optimum, "relatively fewer items are mastered and relatively more items get ‘stuck’ in deck 1"; descriptive, no test reported.

"However, as the arrival rate increases past the optimum, relatively fewer items are mastered and relatively more items get ‘stuck’ in deck 1."

Discussion¶

Related Claims¶

• Under the Leitner Queue Network model, raising the rate of new-item introduction beyond a threshold causes a phase transition in learning rate, which a Mechanical Turk vocabulary experiment reproduced. — possibly the same claim (merge candidate)
• In simulation, the mean-recall approximation matches the clocked-delay Leitner Queue Network for small arrival rates, and its phase-transition threshold appears to be a conservative lower bound. — related