Harth E
Physics Department, Syracuse University, New York 13244-1130, USA.
Conscious Cogn. 1995 Sep;4(3):346-68. doi: 10.1006/ccog.1995.1042.
Subjective consciousness suggests a unity of the sensing and perceiving self that is difficult to reconcile with the multiplicity of sensory analyzers and the absence of a convergence zone in the brain. This has led--on the one hand--to the dead-end assumption of a unifying sentient homunculus and--on the other--to a denial of conscious unity. The sketchpad model presented here avoids this dilemma by viewing conscious thought as a selfreferent loop of neural activity, rather than as the information content of a fictitious set of output neurons. Use is made of the numerous neural pathways that originate at various cortical and subcortical areas and terminate in the thalamus. The model assumes that primary sensory inputs are modified by such feedback in the thalamic relay nuclei through hill-climbing processes that tend to optimize global responses.
主观意识表明感知自我是一个统一体，这很难与多种感觉分析器以及大脑中缺乏汇聚区的情况相协调。这一方面导致了统一的有感知力的小人的死胡同假设，另一方面导致了对意识统一性的否定。这里提出的画板模型避免了这种困境，它将有意识的思维视为神经活动的自我参照循环，而不是虚构的一组输出神经元的信息内容。利用了起源于不同皮层和皮层下区域并终止于丘脑的众多神经通路。该模型假设，初级感觉输入通过丘脑中继核中的这种反馈，通过倾向于优化全局反应的爬山过程而得到修改。
