Comments, with reply, on "Optimal respiratory controller structures

The commenter points out several defects in the modified respiratory controller model described in the above paper (ibid., vol.BME-33, p.677-80, 1986). He argues that: (1) the assumption of additive response characteristics is problematic, (2) the proposed additive controller structure is inherently redundant and unnecessary, and (3) these ambiguities aside, an alternative additive-type optimal controller model exists which has a different neuronal structure than the one described by the authors, i.e. the additive controller structure is not unique. The authors provide a counterargument.<>