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. Author manuscript; available in PMC: 2019 Feb 21.
Published in final edited form as: Neuroscience. 2017 Dec 23;372:97–113. doi: 10.1016/j.neuroscience.2017.12.018

Figure 6.

Figure 6

Two processes contributing to perception at different levels: The descending process, {RC}n => {r; c}i => λj, n < i < j, and the ascending process, {Ia; Ib; II}p => {α;f}q => {S}m, p > q > m. The subscripts stand for dimensionalities of the corresponding spaces. At each level, length and force sense emerges at the level of interaction between {λ} and {Ia; Ib; II}, between {r; c} and {α;f}; and between {RC} and {S}. Perception of relevant state variables (a vector P) can be expressed as: P = RC + S. The “+” sign in this equation should be viewed as symbolic. For simplicity, the figure is not showing interactions between the ascending and descending processes and feedback loops among levels.