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Single-trial behaviour of RNN best for three geometries associated with different arm lengths and different measured time intervals (tm 1 and tm 2 ). Left: an easy trial where tm 1 and tm 2 match the left bottom exit. Middle: tm 1 and tm 2 are inconsistent with all exits; the RNN first chooses rightwards on the basis of tm 1 and then upwards on the basis of tm 2 . Right: tm 1 and tm 2 are inconsistent with all exits; the RNN first chooses rightwards on the basis of tm 1 but, upon seeing tm 2 , switches its attention to left and chooses the left-up as its final choice. The two red arrows trace RNN best decisions after tm 1 and tm 2 . The green circle shows the correct answer. See Methods for details.

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