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Hack Notes CVA 090415
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===A hike in Tilden=== *I went on a hike and it was simply brilliant. **I hiked a few trails which I have hiked or run probably well over a thousand times in Tilden Regional Park (on the edge of which I grew up). **Here’s the wild part: I know these trails really, really, really well. All of them. Turns out, many of them veer wildly from their orientations in my mental map. The most remarkable parts were in the middle stretches of well-sheltered trails, particularly bits in the middle surrounded by canyon walls and lots of trees. There were times I was walking nearly 90° off of the heading in which I thought I was walking. I was sometimes well off of my expected heading even in exposed bits of trail. **Intersections, however, were generally oriented within maybe 10-15° of what I expected. This suggests to me that my mental map is organized by how the trails connect to each other and where they begin and end, but does very little to account for how the trails actually get there. **I also noticed that much of the error I was perceiving was related to expecting sections of trail to be more or less headed in a cardinal direction. My brain seems to have done a lot of regularizing wiggly paths into a more manageable network of straight lines, enough so that I was really conscious of the fact that North was often really not where I expected it to be.
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