Coppola D M, White L E, Fitzpatrick D, Purves D
Department of Neurobiology, Box 3209, Duke University Medical Center, Durham, NC 27710, USA.
Proc Natl Acad Sci U S A. 1998 Mar 3;95(5):2621-3. doi: 10.1073/pnas.95.5.2621.
We have measured the amount of cortical space activated by differently oriented gratings in 25 adult ferrets by optical imaging of intrinsic signal. On average, 7% more area of the exposed visual cortex was preferentially activated by vertical and horizontal contours than by contours at oblique angles. This anisotropy may reflect the real-world prevalence of contours in the cardinal axes and could explain the greater sensitivity of many animals to vertical and horizontal stimuli.
我们通过对内在信号的光学成像,测量了25只成年雪貂的视觉皮层中由不同方向光栅激活的区域大小。平均而言,与倾斜角度的轮廓相比,垂直和水平轮廓优先激活的暴露视觉皮层面积要多7%。这种各向异性可能反映了主方向轮廓在现实世界中的普遍性,并且可以解释许多动物对垂直和水平刺激具有更高敏感性的原因。