Possible role for recurrent interactions between expansion and contraction cells in MSTd during self-motion...

Area of Science:

• Neuroscience
• Computational Neuroscience
• Visual Perception

Background:

• The medial superior temporal area (MSTd) of the cortex contains neurons sensitive to radial optic flow patterns.
• These patterns are critical for perceiving self-motion, including forward and backward movement.
• The role of recurrent connectivity between different neuronal populations within MSTd remains an open question.

Purpose of the Study:

• To investigate the functional role of recurrent interactions between MSTd cells tuned to expansion and contraction.
• To determine if these interactions are essential for accurate heading perception in dynamic environments.
• To model the impact of such connectivity on self-motion perception.

Main Methods:

• Development of a neural model simulating MSTd circuits with varying recurrent connectivity.
• Generation of model predictions for heading perception under self-motion with a retreating object.
• Conducting a psychophysical experiment to gather human heading judgments for comparison with model predictions.

Main Results:

• Human heading judgments aligned exclusively with models incorporating recurrent connectivity within and between expansion and contraction cell populations.
• Both model and human judgments exhibited biases related to the object's trajectory relative to the observer's path.
• The study identified specific biases when the object crossed the observer's path versus when it did not.

Conclusions:

• Recurrent interactions among MSTd expansion and contraction cells are a plausible mechanism for robust self-motion perception.
• These interactions are vital for resolving heading, particularly in complex, dynamic visual scenes.
• The findings support the importance of neural circuit dynamics in visual navigation and postural control.