Clustering of self-motion selectivity and visual response properties in macaque area MSTd

Area of Science:

• Neuroscience
• Sensory Processing
• Computational Neuroscience

Background:

• Neurons in the medial superior temporal area (MSTd) respond selectively to visual optic flow and vestibular stimuli related to self-motion.
• Previous research indicated clustering of directional preferences for optic flow in MSTd, suggesting topographic mapping.
• The clustering of vestibular directional preferences in MSTd remained untested.

Purpose of the Study:

• To investigate whether neurons in MSTd exhibit clustered directional preferences for vestibular stimuli, similar to visual stimuli.
• To determine if MSTd integrates multisensory self-motion information through topographic organization.
• To analyze the clustering of visual receptive field properties in MSTd.

Main Methods:

• Compared tuning of single units (SUs) with multiunit (MU) activity from neighboring neurons.
• Recorded responses to translational and rotational vestibular stimuli.
• Analyzed visual receptive field maps using reverse-correlation techniques.

Main Results:

• Directional preferences for both translational and rotational vestibular stimuli are clustered in MSTd.
• MU activity shows significant vestibular tuning, though weaker for translation than rotation.
• Clustering of local directional preferences and spatial receptive field profiles for visual stimuli was confirmed.

Conclusions:

• MSTd neurons are topographically organized based on directional preferences for both visual and vestibular self-motion cues.
• This organization supports the hypothesis of MSTd as a multisensory area for self-motion representation.
• Findings have implications for understanding how self-motion information is decoded from MSTd neuronal populations.