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Data from: Behavioral evidence for memory replay of video episodes in the macaque

Citation

Zuo, Shuzhen et al. (2020), Data from: Behavioral evidence for memory replay of video episodes in the macaque, Dryad, Dataset, https://doi.org/10.5061/dryad.3r2280gcc

Abstract

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, they 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 monkeys apply a non-linear forward, time-compressed replay mechanism during the temporal-order judgement. In contrast with humans, such compression of replay is however not sophisticated enough to allow them to skip over irrelevant information by compressing the encoded video globally. We also reveal that the monkeys detect event contextual boundaries and such detection facilitates recall by an increased rate of information accumulation. Demonstration of a time-compressed, forward replay like pattern in the macaque monkeys provides insights into the evolution of episodic memory in our lineage

Methods

We collected the data from six rhesus macaques and seven human subjects. Trials with RT longer than 10 s (1.45%) or faster than 0.7 s (2.47%) were excluded from the analyses. Both correct and incorrect trials were entered for all analyses, except those reported in the GLMs. For Neptune, data of one day of primate list 5 (exposure 4) and two days of primate lists 4 and 5 (exposure 5) were lost due to machine breakdown and thus only 4,700 trials are included for Neptune.

Funding

National Key Fundamental Research Program of China, Award: 2013CB329501

Ministry of Education of PRC Humanities and Social Sciences Research, Award: 16YJC190006