Detecting Biological Motion Signals in Human and Monkey Superior Colliculus: a Subcortical-cortical Pathway for Biological Motion Perception

Overview

Journal Nat Commun

Specialty Biology

Date 2024 Nov 6

PMID 39505906

Authors

Xiqian Lu

Zhaoqi Hu

Yumeng Xin

Tianshu Yang

Ying Wang

Peng Zhang

Ning Liu

Yi Jiang

Affiliations

Soon will be listed here.

Abstract

Most vertebrates, including humans, are highly adept at detecting and encoding biological motion, even when it is portrayed by just a few point lights attached to the head and major joints. However, the function of subcortical regions in biological motion perception has been scarcely explored. Here, we investigate the role of the superior colliculus in local biological motion processing. Using high-field (3 T) and ultra-high-field (7 T) functional magnetic resonance imaging, we record the neural responses of the superior colliculus to scrambled point-light walkers (with local kinematics retained) in both humans and male macaque monkeys. Results show that the superior colliculus, especially the superficial layers, selectively responds to local biological motion. Furthermore, dynamic causal modeling analysis reveals a subcortical-cortical functional pathway that transmits local biological motion signals from the superior colliculus via the middle temporal visual complex to the posterior superior temporal sulcus in the human brain. These findings suggest the existence of a cross-species mechanism in the superior colliculus that facilitates the detection of local biological motion at the early stage of the visual processing stream.

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