TY - JOUR TI - Behavioral evidence for memory replay of video episodes in the macaque AU - Zuo, Shuzhen AU - Wang, Lei AU - Shin, Jung Han AU - Cai, Yudian AU - Zhang, Boqiang AU - Lee, Sang Wan AU - Appiah, Kofi AU - Zhou, Yong-di AU - Kwok, Sze Chai A2 - Gold, Joshua I A2 - Barense, Morgan A2 - Strange, Bryan VL - 9 PY - 2020 DA - 2020/04/20 SP - e54519 C1 - eLife 2020;9:e54519 DO - 10.7554/eLife.54519 UR - https://doi.org/10.7554/eLife.54519 AB - Humans recall the past by replaying fragments of events temporally. Here, we demonstrate a similar effect in macaques. We trained six rhesus monkeys with a temporal-order judgement (TOJ) task and collected 5000 TOJ trials. In each trial, the monkeys watched a naturalistic video of about 10 s comprising two across-context clips, and after a 2 s delay, performed TOJ between two frames from the video. The data are suggestive of a non-linear, time-compressed forward memory replay mechanism in the macaque. In contrast with humans, such compression of replay is, however, not sophisticated enough to allow these monkeys to skip over irrelevant information by compressing the encoded video globally. We also reveal that the monkeys detect event contextual boundaries, and that such detection facilitates recall by increasing the rate of information accumulation. Demonstration of a time-compressed, forward replay-like pattern in the macaque provides insights into the evolution of episodic memory in our lineage. KW - drift diffusion model framework KW - event boundary detection KW - forward replay-like pattern KW - naturalistic material KW - time compression of memory traces KW - temporal order judgement JF - eLife SN - 2050-084X PB - eLife Sciences Publications, Ltd ER -