PS267 Chapter Notes - Chapter 3: Thalamus, White Matter, Apical Dendrite
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Chapter 3 the tools of cognitive neuroscience: functional neuroimaging. The cell fires vigorously when the stimulus is presented in the upper right quadrant, thus defining the upper right as the receptive field for this cell. As figure 3. 19 shows, all visually sensitive cells respond to stimuli in only a limited region of space. This (cid:396)egio(cid:374) of spa(cid:272)e is (cid:396)efe(cid:396)(cid:396)ed to as that (cid:272)ell"s (cid:396)e(cid:272)epti(cid:448)e field. Fo(cid:396) e(cid:454)a(cid:373)ple, so(cid:373)e (cid:374)eu(cid:396)o(cid:374)s (cid:396)espo(cid:374)d (cid:449)he(cid:374) the stimulus is located in the lower left portion of the visible field. For other neurons, the stimulus may have to be in the upper right (figure 3. 19b). Neighboring cells have at least partially overlapping receptive fields. As a region of visually responsive cells is traversed, there is an orderly relation between the receptive-field properties of these cells and the external world. In vision, topographic representations are referred to as retinotopic. Cell activity within a retinotopic map correlates with the location of the stimulus (figure 3. 20a, b).
