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. Author manuscript; available in PMC: 2015 Jun 9.
Published in final edited form as: Neuron. 2010 Mar 11;65(5):695–705. doi: 10.1016/j.neuron.2010.01.034

Table 1.

Comparison of shortcuts observed with expected proportions of shortcuts given random pairings of forward and backward replays.

Sequence type Expected (E) probability Bootstrap probability Observed (O) probability Significance of O-E difference (binomial test)
Disjoint sequences 20/32 = 62.5% 64% 0/19 = 0% 8 × 10−9
Non-shortcut sequences 8/32 = 25% 24% 3/19 = 15% 0.15
Shortcut sequences 4/32 = 12.5% 12% 16/19 = 84% 2 × 10−12
Shortcut sequences under back-to-back replay theory 4/12 = 33.3% 33% 16/19 = 84% 7 × 10−6