tailieunhanh - NEUROLOGICAL FOUNDATIONS OF COGNITIVE NEUROSCIENCE - PART 2

Định và ý định liên kết chặt chẽ. Mức độ nhận thức và hành động phối hợp trong việc hình thành và nuôi dưỡng cơ quan đại diện không gian đáng kể. Những hành động bản thân, cho dù họ là những chuyển động mắt, cử động đầu, hay những chuyển động chân tay trong không gian, | Anjan Chatterjee 18 of the object itself or to axes intrinsic to the environment. Attention and Intention Attention and intention are tightly linked. The extent to which perception and actions are coordinated in the formation and sustenance of spatial representations is remarkable. The actions themselves whether they are eye movements head movements or limb movements in space are also related to notions of different kinds of reference frames. Attention and Perception Attention and perception may not be as distinct as is often thought. Processing of relatively early stages of perception seems to be modulated by attention although the precise boundaries between the two remain to be worked out. Unresolved Issues Despite this convergence of ideas I would like to mention some issues that in my view warrant further consideration. Some questions involve research in neglect directly and others involve the relationship of findings in neglect and other approaches. Contralesional Hyperorientation in Neglect Why do patients with right brain damage sometimes hyperorient into contralesional space rather than neglect contralesional space We are used to thinking of neglect as the tendency to orient toward or act in ipsilesional space. However in some cases patients seem to be drawn contralesionally. The most robust of these contralesional productive behaviors is the crossover phenomenon in which patients bisect short lines usually less than 4 cm to the left of the midline. However there are other dramatic instances of contralesional hyperorientation Chatterjee 1998 . Some patients bisect long lines in contralesional space Adair Chatterjee Schwartz Heilman 1998a Kwon Heilman 1991 . Some patients will point into contralesional space when asked to indicate the environmental midline Chokron Bartolomeo 1998 . What has happened to left-sided representations or to motor systems directed contralesionally to produce this paradoxical behavior Memory Attention and Representation How does .

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