The Koniocellular Pathway and Its Role in Blindsight: Evidence Across Species

Abstract

The lateral geniculate nucleus (LGN), located in the thalamus, serves as the brain’s primary relay for visual information from the retina to the cortex [1,2]. It is organized into three main cellular subsystems: magnocellular (M), parvocellular (P), and koniocellular (K) layers, each processing different visual features [3]. Magnocellular neurons (M cells) are large, fast-conducting cells specialized for detecting motion, luminance contrast, and low spatial frequency information— critical for tracking moving objects [4]. Parvocellular neurons (P cells) are smaller, slower conducting, and tuned to fine detail, high spatial frequency, and red-green color discrimination— key for object recognition and reading [3]. Koniocellular neurons (K cells) are small, diverse relay cells located between the M and P layers. They process multiple visual modalities, including short-wavelength (“blue”) color information, spatial and motion cues, and possibly brain-state modulating rhythms [5, 6]. K cells have unique projections to both primary visual cortex (V1) and extrastriate visual areas, including MT/V5, making them a prime candidate for alternative visual processing routes [7].

Citation

Staes GO, Elkomi R, Nelson L, Gillani SF, Bisrat M, Michael M. The Koniocellular Pathway and Its Role in Blindsight: Evidence Across Species. WebLog J Ophthalmol Vis Sci. wjovs.2026.c0302. https://doi.org/10.5281/zenodo.19035650