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Perceiving heading in the presence of moving objects

W H Warren¹, J A Saunders

¹Department of Cognitive and Linguistic Sciences, Brown University, Providence, RI 02912, USA.

|January 1, 1995

Summary

Navigating with moving objects can cause heading errors. This study shows that the brain does not segment moving objects before estimating heading, suggesting a weighted spatial pooling mechanism for heading perception.

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Area of Science:

Visual perception
Navigation
Computational neuroscience

Background:

Heading estimation from optic flow typically assumes a static environment.
Independently moving objects in a scene can introduce systematic errors in perceived heading.
Previous models often assume segmentation of moving objects before heading calculation.

Purpose of the Study:

To investigate how independently moving objects affect heading perception.
To determine if scene segmentation occurs before heading estimation.
To test a spatial pooling model for heading perception in dynamic environments.

Main Methods:

Simulated observer translation towards a random-dot plane with a square object moving in depth.
Manipulated object path to create a secondary focus of expansion (FOE') offset from the actual heading (FOE).
Measured perceived heading bias with transparent and opaque objects.

Main Results:

Moving objects biased perceived heading towards the secondary focus of expansion (FOE').
Bias was approximately 1.9 degrees for transparent objects and 3.4 degrees for opaque objects.
No heading bias occurred when the object was not obscuring the primary focus of expansion (FOE).

Conclusions:

Scene segmentation does not precede heading estimation.
Perceived heading relies on spatial pooling of optic flow, weighted towards the center.
This mechanism may be an adaptive strategy for navigating environments with obstacles.

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