PNAS | 眼跳一动，地位先知：杏仁核用β/γ节律“预判”谁更强

基本信息：

Title: Saccade-related LFP power transients in the primate amygdala and hippocampus linked to the perception of social status

发表时间：2026.1.2

Journal:PNAS

影响因子：9.1

PNAS 2026 paper

引言

我们在看一段“社交冲突”视频时，视线并不是随机乱扫：谁更强势、谁在威胁、谁在示弱，往往会决定我们下一次把眼睛挪到哪里、停多久。现实里也是一样：开会时你会更常瞄向掌控话语权的人；在群体互动中，你会更关注被施压者的表情变化，因为那里面藏着局势走向。

问题是，大脑如何把这种“社会地位（social status）”的抽象判断，转化为毫秒级的眼跳（saccade）计划？传统的预测性重映射（predictive remapping）多在视觉皮层与眼动相关皮层回路讨论，但杏仁核（amygdala）和海马（hippocampus）并不属于典型眼动核心网络，却与社会线索提取、面孔注视偏好、以及与记忆引导的注视选择密切相关。作者提出一个关键假设：当观察者在自然观看中准备把目光转向“更高地位”的对象时，杏仁核/海马的局部场电位（local field potentials, LFP）会出现可测的、与社会地位相关的节律性功率瞬变（power transient），它既可能反映对即将注视目标的“预选择”，也可能体现眼跳后对社会信息的“再加工”。因此，这项研究把“地位判断”与“眼跳时间锁定的神经振荡”直接扣在一起，试图用频段（β/γ）与时序（眼跳前/后）来回答：大脑究竟是在眼跳前就预测了“谁值得看”，还是在眼跳后才完成“看懂他的地位”。

核心发现

1）注视偏好：更常看“高地位”

观看支配—服从互动时，猴子对支配者（dominant）的注视更久、更频繁；眼跳在个体间切换时，可按“起点/落点地位”稳定分型（图1）。

2）时间锁定反应：眼跳后电位能区分“看谁”

杏仁核（amygdala）与海马（hippocampus）的事件相关电位（ERP）在眼跳后出现差异，能区分注视支配者 vs 服从者，也能区分社会视频 vs 物体/空屏（图2）。

3）β段编码“预判/事后”：看强者偏眼跳前，看弱者偏眼跳后

从服从者切到支配者时，杏仁核出现眼跳前高β（~20–25 Hz）功率增强；从支配者切到服从者时，更偏眼跳后β增强（图3）。

4）γ段标记“社交眼跳”：跟随支配者目光更早更强

在凝视跟随（GF）与共同注意（JA）等“社交含量高”的眼跳中，指向支配者线索时，眼跳后低γ（~30–45 Hz）增强更早出现、幅度更强（图4）。

归纳总结和点评

这项研究把“社会地位”从行为学上的注视偏好，进一步落到眼跳对齐的神经振荡上：杏仁核对“即将注视的对象是否高地位”给出眼跳前的β段预信号，而眼跳后的γ段更像是对落点社会信息的快速处理带宽；海马在普通地位切换中相对弱，但在GF/JA等高社会含量眼跳中与杏仁核一起出现γ段增强。整体上，作者用严谨的对照（物体视频/空屏、条件相减TFHD、CAR去伪迹）把微弱但稳定的±1 dB功率瞬变做成了“可解释的社会变量”，为理解内侧颞叶如何“指挥我们在社交场景里看哪里”提供了清晰的电生理证据链。

核心图表

Fig. 1. Subjects decode social status from videos of simulated hierarchical interactions and exhibit socially driven eye movements.

Fig. 2. Event-related potentials in the amygdala and hippocampus differentiate between stimulus types.

Fig. 3. The spectral signature of different saccade types.

Fig. 4. Gamma and beta power differentiate the social status of individuals who induce GF and JA saccades.

Abstract

A key aspect of healthy social functioning in both humans and nonhuman primates is the ability to extract status-related information from observing the social signals exchanged between individuals. Knowing the social status of others determines how long we look at them and how we engage with them in social interactions. While looking at faces and eyes requires a functionally intact amygdala, hippocampal memories guide the eyes toward socially relevant areas of a visual scene. We examined the local field potentials associated with socially meaningful eye movements in the amygdala and hippocampus of macaques as they watched videos of dominant–subordinate interactions among unfamiliar conspecifics. In both structures, the saccade-related potentials showed status-dependent amplitude modulation in specific frequency bands. In the amygdala, shifting gaze from lower- to higher-status individuals was associated with anticipatory power transients in the 20 to 25 Hz frequency band, whereas gaze shifts from higher- to lower-status individuals were marked by predominantly postsaccadic power transients. Following the gaze of the aggressive, dominant individual induced increased postsaccadic power in the gamma band in both the amygdala and hippocampus, with some variation in frequency depending on whether the saccade landed on the social partner or elsewhere. The timing, frequency, and status-specificity of these power transients reveal the contribution of the amygdala and hippocampus to the visual exploration of social scenes.