bike: 20 minutes
run: 3.25 miles
Thought about running outside again this morning but decided that I should run inside where it felt warmer than 0 and so I could listen to my audio book which is due in 8 days. (As usual, all of my books became available from the library at the same time.) Watched a few random races while I biked, then listened to the audio book, The Guest List, while I ran. I’m not quite sure why I keep reading/listening to books in this Ruth Ware/Paula Hawkins type genre: British, murder, troubled past, terribly toxic friends, forced gatherings. Do I even enjoy them? I guess I do a little because I always finish them, but I hate most of the characters: lost, selfish, never having their shit together. Listening to it this morning did help the 32 minutes on the treadmill go by much faster. The first few minutes were difficult as I thought, how can I stay on here for another 28 minutes? But it got easier. It is still easier (and much more fun) to run outside. I think one of my goals for this winter will be to work on my aerobic base (the long, slow miles at a lower heart rate) so that when it gets warmer and the paths are clearer I will be fit enough to run for an hour. Yes! I miss running for longer distances, traveling farther away from my house beside the river. So much more to write about.
how we see: eyes and brain
For the past few days, I’ve been reviewing how vision works, from when light enters the eye and hits the retina and then travels through the optic nerve to the visual cortex and the occipital lobe. So much jargon–names for parts of the cells and the neurons and the areas of the brain, ways of discussing direction (dorsal, medial, ventral). How much do I need (or want) to know about this process? When does it become too much, a distraction? What I find fascinating, from my limited research, is how, even as scientists use their fancy language to name/classify the parts of the brain and what they do, there is so much they can’t name or understand. I am not dismissing the important work that is/has been done on how we see, but I’m drawn to the limits of that language and knowledge. The mysterious parts. It seems like there is a lot that scientists don’t know about how the brain processes images and visual information. I’m basing this last conclusion mainly off of the lack of recent articles (in the last 10 years) on how we see and the conclusion to this article (it’s from 1993 so it’s old, yet I haven’t found many more recent articles):
Let me try to give you a sense of where we are, says Margaret Livingstone, in an effort to assess the status of visual research today. Take form perception. Human beings are very good at it. We recognize contours, faces, words, a lot of really complicated things. What we understand is that in the retinas, the lateral geniculate bodies, and the first layer of the visual cortex, we code for changes in brightness or color. In the next stage, cells become selective for the orientation of the change–that is, they code for contours, or edges. In some places cells select for the length of the contour. Then, if you go up very high, you find cells selective for certain faces. Livingstone pauses. We know remarkably little about what happens in between. It’s frightening how big a gap there is.The Vision Thing
Instead of understanding these gaps as failures to KNOW, I like to think of them as reminders that seeing/vision is so much more than we can or ever will understand. It is complex and can’t be reduced to the simple, naive idea that our eyes see what’s in the world and then our brain correctly communicates that exact image to us. I am not sure this makes sense, but I have been interrupted several times in writing this entry and I think I lost my train of thought. I’ll keep it in and work on it later.
a moment of sound
Listen to those birds! Right outside my front door. It’s 18 degrees, but sounds like spring.