Negative Imaginary (NI) systems theory is an emerging branch of control theory that focuses on the frequency response characteristics of dynamical systems. At its core, the theory exploits conditions ...

Maintaining perfect stability through negative feedback is a basic element of electrical circuitry, but it’s been a mystery how cells could do it — until now. Mustafa Khammash’s small Lego robot is ...

Many physiological behaviours of cells are repeated periodically in time, such as hormone secretion, second messenger signalling, cell-division cycles and circadian rhythms. Oscillatory behaviour is a ...

New research has shown that negative feedback loops in cell signalling systems can be essential for a cell's ability to perceive the strength of a growth stimulus. New research has shown that negative ...

This paper explicates a Constructivist Epistemology which underlies cybernetic models of perceiving and knowing. We focus on the recent work of W. T. Powers (Behavior: The Control of Perception, ...

Robert L. Clark of Duke University's Pratt School of Engineering explains. Just for the record, feedback is actually the mechanism used to control almost every electronic device manufactured.