Modular, cement-free, customized headpost and connector-chamber implants for macaques

Psarou, Eleni; Vezoli, Julien; Schölvinck, Marieke L.; Ferracci, Pierre-Antoine; Zhang, Yufeng; Grothe, Iris; Roese, Rasmus

doi:10.1101/2022.11.09.515849

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…All animals were fitted with custom-milled headposts for the purpose of head fixation during this experiment. The headpost design and implant procedures for the macaques have been extensively discussed in (72). Briefly, a four-legged titanium baseplate was screwed into the skull under general anesthesia.…”

Section: Methodsmentioning

confidence: 99%

Thoughtful faces: inferring internal states across species using facial features

Tlaie,

Abd El Hay,

Mert

et al. 2024

Preprint

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Animal behaviour is shaped to a large degree by internal cognitive states, but it is unknown whether these states are similar across species. To address this question, we developed a virtual reality setup in which mice and macaques engage in the same naturalistic visual foraging task. We exploited the richness of a wide range of facial features extracted from video recordings during the task, to train a Markov-Switching Linear Regression (MSLR). By doing so, we identified, on a single-trial basis, a set of internal states that reliably predicted when the animals were going to react. At any one moment, one state was dominant, and mice transitioned through these dominant states faster than monkeys. The model could predict not only reaction time, but also task outcome, supporting the behavioural relevance of the inferred states. The thus characterised states were similar between mice and monkeys. Thus, we were able to flexibly and agnostically track the dynamics of several internal states, identifying general principles of naturalistic cognitive processing across species.

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Section: Methodsmentioning

confidence: 99%

Thoughtful faces: inferring internal states across species using facial features

Tlaie,

Abd El Hay,

Mert

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…The experiment was approved by the responsible local authority (Regierungspräsidium Darmstadt). Both animals were implanted with a titanium headpost [30]. Monkey G had a recording chamber implanted for addressing other scientific questions.…”

Section: Participants and Animalsmentioning

confidence: 99%

Primate Saccade Rhythmicity

Näher,

Zhang,

Pandinelli

et al. 2023

Preprint

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Active sensing behaviors in rodents display theta (4-8 Hz) rhythmicity. Whether similar rhythmicity exists in primate saccadic eye movements has remained a matter of debate. We studied saccade dynamics in 22 human participants and two macaque monkeys, examining the influence of different visual stimuli and tasks. Inter-saccadic intervals (ISIs) reliably revealed a characteristic duration and under certain conditions clear theta rhythmicity. Rhythmicity was strongest for saccades with short ISIs. Surprisingly, the degree of rhythmicity was not due to spatial regularity of the visual scene, but it was shaped by task demands. Macro- and micro-saccade ISIs shared similar characteristic durations. Naturally occurring micro-saccades provided evidence that ISIs can become more regular without becoming faster. During free-viewing, subsequent ISIs were not independent, but the visual system switched between states of low and high rhythmicity. Humans and macaques showed similar saccade dynamics, suggesting a potential common evolutionary trait in primate active visual sensing.Significance StatementActive sensing, wherein organisms deliberately orient their sensory organs to probe their environment, is a cornerstone of perceptual experience. While certain animals like rodents showcase rhythmic patterns in such behaviors, the presence of similar rhythms in primate vision remains contested. In our two-species study, involving human participants and macaque monkeys, we unveil a distinctive rhythmic pattern of saccades, the main visual sensing behavior of primates. Interestingly, this rhythm resonates with known theta rhythms. Notably, this rhythmicity was not necessarily determined by the visual scene but was modulated by the task at hand. Our findings shed light on a potentially shared evolutionary trait in primate vision, underscoring the intricate interplay between perception, action, and cognition.

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Eccentricity-Dependent Saccadic Reaction Time: The Roles of Foveal Magnification and Attentional Orienting

Zhang

2023

Preprint

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A hallmark of primate vision is the emphasis on foveal processing, accompanied by frequent saccades that bring the fovea to salient parts of the scene, or to newly appearing stimuli. A saccade to a new stimulus is one of the most fundamental sensory-motor transformations. In macaque monkeys, we show that foveal magnification is not only the reason for saccades, but it also governs the dynamics of saccade initiation. In a task where the monkeys made saccades to peripheral target onsets, saccadic reaction time (SRT) increased with target eccentricity. Notably, we effectively eliminated this increment by scaling the target size according to the foveal magnification factor in the superior colliculus (SC). We repeated the comparison between non-scaled and scaled targets, while changing the task to a delayed saccade task. In this task, the target was presented long before the saccade, and the saccade was triggered by fixation offset rather than target onset, such that target onset was essentially irrelevant for SRT. Crucially, in this task, we found that SRT increased with target eccentricity, for both non-scaled and scaled targets. Furthermore, this increment survived the addition of a salient foveal distracting flash. The results obtained with the delayed saccades task are consistent with an attentional scan from the fovea to the target, a recently hypothesized general mechanism of attention.

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Modular, cement-free, customized headpost and connector-chamber implants for macaques

Cited by 3 publications

References 19 publications

Thoughtful faces: inferring internal states across species using facial features

Thoughtful faces: inferring internal states across species using facial features

Primate Saccade Rhythmicity

Eccentricity-Dependent Saccadic Reaction Time: The Roles of Foveal Magnification and Attentional Orienting

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