Topic: chromatic information

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

Along with other visual features, chromatic information is extracted by the retina. The excitatory, feedforward pathways of chromatic signals in the mouse retina have recently been investigated (Szatko et al., 2020), but it is unclear how inhibitory cell types contribute. In particular, a systematic characterization of chromatic responses in amacrine cells (ACs), the largest and most diverse retinal class of inhibitory neurons, is missing, and the ACs’ role in color processing remains unknown. One challenge in studying AC responses is the fact that most of them lack axons and signal primarily