A feedback-control model of human vision

1966 ◽  
Vol 54 (9) ◽  
pp. 1226-1229 ◽  
Author(s):  
G. Biernson
Keyword(s):  
Feedback Control ◽  
Control Model ◽  
Human Vision

Comment on "A feedback-control model of human vision"

1966 ◽  
Vol 54 (8) ◽  
pp. 1129-1130 ◽  
Author(s):  
E.F. MacNichol ◽  
W.A.H. Rushton ◽  
G. Biernson
Keyword(s):  
Feedback Control ◽  
Control Model ◽  
Human Vision

A feedback-control model of human vision

1966 ◽  
Vol 54 (6) ◽  
pp. 858-872 ◽  
Author(s):  
G. Biernson
Keyword(s):  
Feedback Control ◽  
Control Model ◽  
Human Vision

scholarly journals Cilia oscillations

2019 ◽  
Vol 375 (1792) ◽  
pp. 20190157 ◽  
Author(s):  
Yi Man ◽  
Feng Ling ◽  
Eva Kanso
Keyword(s):  
Feedback Control ◽  
Motor Activity ◽  
Molecular Motors ◽  
Molecular Motor ◽  
Control Model ◽  
Eukaryotic Cells ◽  
Sperm Number ◽  
Sliding Motion ◽  
Molecular Machinery ◽  
Oscillation Frequencies

Cilia, or eukaryotic flagella, are microscopic active filaments expressed on the surface of many eukaryotic cells, from single-celled protozoa to mammalian epithelial surfaces. Cilia are characterized by a highly conserved and intricate internal structure in which molecular motors exert forces on microtubule doublets causing cilia oscillations. The spatial and temporal regulations of this molecular machinery are not well understood. Several theories suggest that geometric feedback control from cilium deformations to molecular activity is needed. Here, we implement a recent sliding control model, where the unbinding of molecular motors is dictated by the sliding motion between microtubule doublets. We investigate the waveforms exhibited by the model cilium, as well as the associated molecular motor dynamics, for hinged and clamped boundary conditions. Hinged filaments exhibit base-to-tip oscillations while clamped filaments exhibit both base-to-tip and tip-to-base oscillations. We report the change in oscillation frequencies and amplitudes as a function of motor activity and sperm number, and we discuss the validity of these results in the context of experimental observations of cilia behaviour. This article is part of the Theo Murphy meeting issue ‘Unity and diversity of cilia in locomotion and transport’.

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