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35 votes
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Did predators evolve eyes first?

Short answer Complex eyes may have evolved first in predator species, specifically in box jellyfish. Trilobites are another group of animals where complex eyes may have evolved first. The trilobites ...
AliceD's user avatar
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20 votes

Did predators evolve eyes first?

AliceD's answer is great but just to address your points 1 and 2. Eyes are expensive. From a study on fish loosing their vision in caves. The cost of vision was calculated to be 15% of resting ...
Sam Dean's user avatar
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13 votes

Did predators evolve eyes first?

Eyes evolved multiple independent times in convergent evolution. Almost all the vertebrates have eyes. Those few that doesn't lost their eyes through evolution and live in deep ocean of in caves where ...
Victor Stafusa - BozoNaCadeia's user avatar
3 votes

Where does the notion that "a single eye has no depth perception" come from?

You've mentioned a couple monocular depth cues; there are quite a few more monocular cues you've missed, and there are also binocular ones. Wikipedia's list includes: Stereopsis Convergence and "...
Bryan Krause's user avatar
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2 votes
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why do we use the glasses so that a different image is seen in each eye in the binocular rivalry experiment?

I'd recommend backing up a bit and looking at the big picture. What's the whole point of these experiments? Binocular rivalry is an observation, like seeing that the sky is blue is an observation. ...
Bryan Krause's user avatar
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2 votes
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How does retinal ganglion cell receptive field affect the LGN neuron activity?

The picture is showing you how receptive fields are combined at different levels of the visual processing hierarchy. The activity of multiple cells is combined to influence the activity of the ...
Bryan Krause's user avatar
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2 votes
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what does concentric antagonistic areas in the retina mean?

Antagonistic means opposite/opposing. The receptive fields have ON and OFF areas that oppose each other; that is, light on the surrounding area has opposite effect of light on the center. It gets ...
Bryan Krause's user avatar
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1 vote

Vision and signal through the nervous system: Is it Frequency Shift Keying?

Frequency-shift keying is an electronic communications approach, part of a broader set of frequency modulation strategies for conveying information. These strategies relate to the difficulty in ...
Bryan Krause's user avatar
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