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Updated: Jan 12, 2026
07:08
Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
Published on: August 1, 2018
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Receptive fields from single-neuron recording and MRI reveal similar information coding for binocular depth
Andrew J Parker1,2,3, Ivan Alvarez4,5, Alessandro Mancari5,6
1Department of Sensory Physiology, Institute of Biology, Otto von Guericke University, Magdeburg 39120, Germany.
Summary
The population receptive field (pRF) method now measures binocular depth perception in the human brain. This magnetic resonance imaging (MRI) technique reveals detailed visual processing, aligning with animal studies.
Area of Science:
- Neuroscience
- Visual Perception
- Magnetic Resonance Imaging
Background:
- The population receptive field (pRF) approach is a functional measurement technique using magnetic resonance (MR) imaging.
- This method has primarily characterized sensory properties in retinotopic coordinates.
- Extending pRF to binocular depth perception offers new insights into human visual cortex function.
Purpose of the Study:
- To extend the population receptive field (pRF) approach to quantify binocular depth perception in the human brain.
- To compare human pRF measurements of depth processing with electrophysiological recordings in macaque cortex.
- To investigate the sensitivity of pRF measures for fine-scale depth differences.
Main Methods:
- Population receptive fields (pRFs) were extracted from nine human visual areas (V1, V2, V3, V3AB, V4, V5, V7, VOC, LOC) using functional magnetic resonance imaging (fMRI).
- pRFs were analyzed for their encoding of binocular depth information.
- Comparisons were made with existing electrophysiological data from homologous areas in macaque monkeys.
Main Results:
- Human and macaque V1 showed similar profiles for encoding binocular depth.
- Both human and macaque V5 exhibited stimulus-dependent changes in preferred binocular depth for correlated and anticorrelated stimuli.
- Higher visual areas demonstrated increased responsiveness to relative depth, consistent with macaque electrophysiology.
- pRF measures were more sensitive to fine-scale binocular depth differences than many existing electrophysiological methods.
Conclusions:
- The pRF method is successfully extended to measure higher-order visual properties, specifically binocular depth perception.
- Noninvasive MR-based pRF measures in humans show strong parallels with invasive electrophysiological recordings in animals, supporting pRF methodology validation.
- This extended pRF approach provides a sensitive tool for investigating complex visual processing in humans.
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