PSYB51H3 Chapter Notes - Chapter 3: Torsten Wiesel, Refractive Error, Medical Optical Imaging
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Clara rebello (a) a square wave grating: the light intensity in such gratings varies smoothly and continuously across each cycle (b) a sine wave grating. It"s the fi(cid:374)est high-contrast detail that can be resolved: minimum recognizable acuity the angular size of the smallest feature that one can recognize or identify, approach is still used today by eye doctors. Introduced by herman snellen: minimum discriminable acuity the angular size of the smallest change in a feature (ex. Why sine wave gratings: although (cid:862)pu(cid:396)e(cid:863) (cid:449)a(cid:448)e g(cid:396)ati(cid:374)gs (cid:373)a(cid:455) (cid:271)e (cid:396)a(cid:396)e i(cid:374) the (cid:396)eal (cid:449)o(cid:396)ld, patte(cid:396)(cid:374)s of st(cid:396)ipes (cid:449)ith (cid:373)o(cid:396)e o(cid:396) less fuzzy boundaries are quite common, the edge of any object produces a single stripe (ex. 180 ones: which is why the visual system is able to see all four phases equally well. Clara rebello: contralateral: referring to the opposite side of the body/brain, layers 2, 3, 5 get their input from the right (ipsilateral) eye.
