Colour

In his book, “Full Spectrum: How the Science of Color Made Us Modern” (2021), author Adam Rogers looks to pioneering eighteenth century scientist Thomas Young who first began studying waves of sound in liquids and smoke, “then realized that waves could also account for the shimmering, coloured fringes that Newton had seen in the edges of a lens pressed against a glass, and in the iridescence of soap bubbles or oil on water” (p. 79). In “Eye and Brain: The Psychology of Seeing” (1966), psychologist Richard Gregory has the author of electromagnetism’s elegant equations, mathematician James Clerk Maxwell, describing another of Young’s insights; “that colour is a sensation”:

It seems almost a truism to say that colour is a sensation; and yet Young, by honestly recognizing this elementary truth, established the first consistent theory of colour. So far as I know, Thomas Young was the first who, starting from the well-known fact that there are three primary colours, sought for the explanation of this fact, not in the nature of light, but in the constitution of man” (1966, p. 120).

Philosophers Arthur J. Minton and Thomas Shipka suggest further:

The colors of the peacock and the blazing reds of the setting sun are but subjective qualities produced in the perceiver by a special nervous system that responds selectively to lightwaves (themselves colorless) of varying frequencies. The real world, the world as described by physics, is a colorless, soundless, odorless matter” (1990, p. 129).

Statistician and professor Edward R. Tufte states that the colours of nature present opportune reference sources for background colours of information graphics, in his annotated and illustrated “Envisioning Information” (1990):

What palette of colors should we choose to represent and illuminate information. A grand strategy is to use colors found in nature, especially blues, yellows and grays of sky and shadow. Nature’s colors are familiar and coherent, possessing a widely accepted harmony to the human eye – and their source has a definitive authority. A palate of nature’s colors helps suppress production of garish and content-empty colorjunk” (p. 90).

Tufte uses this premise to highlight the notion of colour salience. “Local emphasis for data is then given by means of spot highlights of strong color woven through the serene background” (p. 90). Rogers elaborates, declaring people’s brains;

“are tuned to talk about and understand not the vast, overwhelming Rayleigh-scattered blue of sky or the roiling wine-dark sea, not the green of a forest, but the rainbow of bright, hot spikes that stand out from it all. That is what our minds care about… Greens and blues are typically things we don’t want to label. These are not ‘objects’… Warm things are the humans and other animals, the berries and the fruits, flowers and stuff” (2021, p. 158).

Rogers looks at current research on colour perception in the context of ultra high definition screen technology, and confirms Maxwell and Young’s truism that indeed “colour is a sensation” revealed in the work of neuroscientist Poppy Crum:

The phantom sensation of heat she was experiencing as a function of luminance alone would have to have a physical analog. “I realized we could track regions on people’s cheeks in response to the flame.. a screen could make people feel things as though they were real, with physiological responses” (2021, p. 209).


Gregory, R. L. (1966) Eye and Brain: The Psychology of Seeing. World University Library, Third Edition (1977), Toronto, Canada: McGraw-Hill Book Company

Minton, A. J. & Shipka, T. A. (Eds.), (1990), Part 2, Knowledge: The Paradox of Appearances, in Philosophy: Paradox and Discovery, Third Edition, (pp. 129 – 130). New York, United States: McGraw-Hill

Rogers, A. (2021) Full Spectrum: How the Science of Color Made Us Modern. New York, United States: Houghton Mifflin Harcourt Publishing Company

Tufte, E. R. (1990) Envisioning Information. Cheshire, United States: Graphics Press LLC

Hallucination 1

“A hallucination is a perception in the absence of external stimulus that has qualities of real perception” (Wikipedia, retrieved April 2020). Not unlike using a different tool or perspective through which to derive information enfolded in a visual scene, studying the anomalous nature of hallucinations can similarly provide insight into how human perception and cognition work. Neurologist Oliver Sacks spent many years closely observing his patients and how they lived with their various neurological afflictions, a number of whom experienced hallucinations. His approach was one of complete immersion, fostered by a driving curiosity and compassion: He wanted to live in their shoes. This level of engagement led to helping many of them see what had been initially diagnosed as a deficit worthy of nothing but social shame, as rather a unique and extraordinary ability.

In patients with Charles Bonnet syndrome, the onset of blindness through macular degeneration can lead to the sudden and unpredictable appearance of visual hallucinations. From a neurological perspective, Sacks believed this form of hallucination was caused by damage to the perceptual system resulting in a misfiring or miscommunication between the lower order region of the visual cortext, the fusiform gyrus, associated with recognition, and the higher order region of the inferotemporal cortex, believed to be associated with emotion and memory. Under normal circumstances this latter area is said to attenuate or dampen the lower order region’s activity. Hallucinations originating in this manner manifest as completely unrecognizable people or cartoon-like faces with exaggerated eyes and mouths. Random visual apparitions that have sometimes led the unfortunate souls experiencing them to believe they were losing their minds, and despite being completely sane, wind up feeling ashamed of their experiences.

According to Sacks, in patients with Charles Bonnet syndrome, the numerous pieces and figments of perceptual information that litter their lower cortical regions can materialize inexplicably and unexpectedly in awareness as hallucinations, free from the apparent filtering of the inferotemporal cortex. The mind confabulates an image from such fragments, believed to be parts of the subconscious recipes for memory and imagination. Under ordinary circumstances, could these be the visual recognition impressions referred to by Manzotti in his Spread Mind theory of consciousness which, as a form of template, are used to match live sensory experience?

Hallucinations may more broadly be related to hyper-stimulated brain activity and behaviour on the manic-seizure side of things, such as that associated with Tourette’s syndrome. In such scenarios, the lower order regions of the brain appear to operate in a way that the higher processing levels and sense gates simply cannot keep up with. Sacks himself experienced visual hallucinations, similar to Charles Bonnet syndrome, but of a geometric variety that accompany a slightly different diagnosis. Interestingly, in his hallucinations he recognized what he felt were simple archetypical designs, described as similar to motifs from prehistoric cave paintings.