Topic: color discrimination

The functional properties of the outermost retinal circuits involved in color discrimination are not well understood across species. Recent experimental work on zebrafish has elucidated the in-vivo activity of photoreceptors and horizontal cells as a function of the stimulus spectrum, highlighting the appearance of chromatic-opponent signals at the first synaptic connection between cones and horizontal cells. These findings, altogether with the observed lack of gap junctions, suggest that the primary mechanism yielding early color-opponency in zebrafish is a dominant inhibitory feedback. The r