Aug 6, 2015
See also: David Hubel
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See also: David Hubel
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The intro for this week’s episode was taken from this demonstration of Hubel and Wiesel’s work on the visual system. Using single cell recording techniques, this video establishes the presence of simple, complex, and hypercomplex cells in the primary visual cortex.
I wanted to use this audio not just because it comes from a remarkably influential set of experiments in neuroscience, but also because much of this week’s episode involves the translation of science done in the laboratory to science as it is described in textbooks and back again. While I was an graduate student focusing on neuroscience, Hubel and Wiesel’s worked loomed so large that they became almost mythic figures. It wasn’t until I actually say Torsten Wiesel speak that I could actually reconcile that they were real people, who really worked in the lab, and encountered the same difficulties as every other scientist.
feature detectors
Feature detectors: specialised neurons that respond only to certain sensory information. David Hubel and Torsten Wiesel demonstrated that specialised neurons in the visual cortext have the ability to respond to specific features of an image - such as curves, angles, lines, and movements.
ex: an area just behind your right ear enables you to perceive faces. damage to this area may result in prosopagnosia - a disorder that causes an inability to detect differences in faces. people suffering from this cannot even recognise their own face in the mirror.