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Dinesh

Dinesh club

Posted: 03 Jan 2023

Taken: 02 Jan 2023

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MAKING SPACE •
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Jennifer Groh •

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PLATE 8

PLATE 8
Early astronomers couldn’t agree on whether the earth o the sun was the center of the universe. On top is Ptolemy’s conception of the earth being orbited by the sun and the other planets. Below is Copernicus’s view, placing the sun at the center. Similarly, the brain’s reference framers for different types of sensory information are anchored differently. The eye is the center of the visual reference frame, but the axis formed by the two ears serves as the center of the auditory reference frame, and the body serves as the center of the reference frame for touch and movement. Whenever the brain wants to compare what it sees, hears, or feels, it must convert signals into some common framework. This conversion must be flexible and take into account the shifting relationship between the original reference frames.

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 Dinesh
Dinesh club
The axes of reference frames are often moveable, so the brain must incorporate information about these movements. Perhaps the most familiar historical examples is the case of whether the earth moves around the sun or vice versa. It certainly appears that the sun goes around the earth: we see it rising in the east in the morning and setting in the west. So it took astronomers many centuries to piece together clues indicating that the earth actually rotates on its axis daily while obtaining the sun annually.

. . . . As we discussed at length, the retina tells the brain where visual stimuli are -- with respect of the direction of the eyes. When the eyes shift, the image of a given object travels across the retinal surface. Our sense of visual space is a synthesis requiring knowledge of eye position and movement.

And eye moments occur constantly. Our eyes dart about roughly three times per second -- more frequently that breathing -- and yet we tend not tobe aware of this. Each eye movement takes less than a tenth of a second, during which your brain suppresses visual information so you don’t see the blur. Even this very gap of vision eludes our consciousness: we see no blackout; we have no sudden sense of darkness. ~ Page 162

MAKING SPACE
17 months ago. Edited 17 months ago.

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