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The Science of Everything Podcast

Episode 45: Vision Part 1

The Science of Everything Podcast

James Fodor

Social Sciences, Natural Sciences, Science

4.8819 Ratings

🗓️ 10 March 2013

⏱️ 53 minutes

🧾️ Download transcript

Summary

We commence our grand journey to understand the visual system by examining the eye, its anatomical structure and physiological properties. I discuss image formation in the eye, including an explanation of the role of the lens, iris, and cornea. I also explain the phototransduction, the fascinating molecular process by which photons falling on the retina are converted into neural signals that the brain can interpret. Recommended prelistening: Episode 18 - Biochemistry Basics, Episode 25 - Tissues, Organs and Systems, Episode 32 - Light and Optics, Episode 38 - Neurons and Synapses.

Transcript

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0:00.0

Oh, wow, oh, oh, wow, oh, wow, oh, wow.

0:13.0

Oh, wow.

0:15.0

Oh, yeah. Hello, you're listening to The Science of Everything podcast, episode 45, vision, and I'm your host, James Fodor.

0:40.1

In this episode, we're going to look at human vision, going right from the eye through to the computational

0:46.0

analysis of visual input in the brain. So this episode is, the content that I have for this

0:52.9

episode is going to be far more than I can fit into a single

0:55.4

podcast. So I'm thinking this is going to go over two, possibly even three episodes, depending

1:00.6

on how we go. So I don't know exactly how much we'll get through in this first episode, but we'll

1:05.6

get as far as we can. So what I'll do is I'll give an overview of everything that I plan to discuss

1:10.5

over the series of episodes, and then we'll get as far as we go in this one, and pick up

1:14.7

where we left off in the next one. So first I'm going to talk about the eye, the anatomy of

1:19.0

the eye, how images are formed, the visual field, and after that we're going to move on to

1:24.1

talking about the retina, which, I mean, is part of the eye, but it's where the actual rods and cones that do the actual transduction of light into neural inputs that

1:33.6

the brain can actually understand. So it's kind of the crucial part of the eye, so we'll sort of

1:37.0

consider it separately, or in its own section. We'll look at rhodopsin, how photo transduction

1:42.2

occurs, the bipolar cells, ganglion cells, and some of the

1:45.7

other cells that are found in the retina.

1:47.1

Then we'll look at the output of the retina from the optic nerve leading through the optic

1:51.6

chasm and into the lateral geniculate nucleus, which is the first region of the brain

1:56.6

that the visual input goes to.

1:59.3

After that, we'll talk about the primary visual cortex, or V1,

2:02.8

the different layers within V1 and cell types, ocular dominance columns, orientation columns,

...

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