# Linking retinal circuits to perception

> **NIH NIH R01** · UNIVERSITY OF WASHINGTON · 2020 · $430,487

## Abstract

If therapeutic approaches are to provide meaningful vision, it is essential that we investigate and discover the
links between human perception and the activity of neurons and circuits in the visual system. Here we propose
to study circuits involving S-cone pathways in primates as a model for how the visual system is organized to
serve diverse functions. Much of the effort in trying to understand the biology of the primate visual system has
emphasized its role in perception, in particular with producing an internal visual representation of the outside
world and the objects and events within it. However, comparative studies of more primitive visual systems
indicate that vision did not originally evolve as a system for perceiving the world. Rather, the visual systems of
lower vertebrates emphasize neural circuitry for directly triggering movements, moment-to-moment, in real time
and pathways serving non-image forming functions such as circadian photoentrainment. Our visual system has
maintained evolutionarily ancient functions that are not directly involved in conscious perception. Attempts to
understand the biology of vision in primates (including humans) that have failed to recognize that much of the
visual system is not concerned with perception have limited our understanding of how the neural pathways
comprising the visual system are organized. Theories of blue-yellow color vison in primates have focused on
the classic “blue-ON” neuron, the small bistratified retinal ganglion cell. However, evidence has accumulated
that these cells may not be directly involved in the conscious perception of blue and yellow hues; rather they
are well suited for triggering spatially directed movements. As an alternative to the idea that small bistratified
ganglion cells are the basis for blue-yellow sensations, we have made discoveries that point to previously
unknown circuitry that may have evolved only in primates specifically for conscious color perception. The goal
of the experiments proposed here is to understand how S-cone pathways in primates are organized to serve
the diversity of functions of the visual system including non-image forming vision functions and the largely
separate functions of constructing a perceptual representation of the world vs. controlling goal-directed actions.
We propose two specific aims:
Specific Aim 1: To work out the diversity of parallel pathways for processing of signals from S cones in the
primate retina using Serial Block Face Scanning Electron Microscopy.
Specific Aim 2: To use a combination of whole-cell and loose patch recording in combination with
pharmacological manipulation of specific synaptic elements to directly measure the spatio-chromatic
organization of the receptive fields of ganglion cells in the primate retina that process signals from S cones,
and to correlate the results to those obtained from anatomical characterization of S-cone pathways.

## Key facts

- **NIH application ID:** 9849282
- **Project number:** 5R01EY027859-03
- **Recipient organization:** UNIVERSITY OF WASHINGTON
- **Principal Investigator:** Jay Neitz
- **Activity code:** R01 (R01, R21, SBIR, etc.)
- **Funding institute:** NIH
- **Fiscal year:** 2020
- **Award amount:** $430,487
- **Award type:** 5
- **Project period:** 2018-02-01 → 2023-01-31

## Primary source

NIH RePORTER: https://reporter.nih.gov/project-details/9849282

## Citation

> US National Institutes of Health, RePORTER application 9849282, Linking retinal circuits to perception (5R01EY027859-03). Retrieved via AI Analytics 2026-05-23 from https://api.ai-analytics.org/grant/nih/9849282. Licensed CC0.

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