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Hi Tom, Thanks very much for your interesting PD gait model in your 4/21/98 posting. You may find the following references useful in your research: The Gait Workbook,A Practical Guide to Clinical Gait Analysis, Slack Inc,1998 by Prof.Jan Bruckner,PhD,PT,Dept. of Physical Therapy,Northeastern Univ.,Boston,MA See Chapter 6,Gait Through the Life Span which discusses the motor control theories that influence the acquisition of mature gait. The book is complemented by a videotape,People Walking: Pathological Patterns and Normal Changes Over the Life Span ISBN# 1-55642-350-0 Both are available from: Slack Inc. Professional Book Division 6900 Grove Rd. Thorofare,NJ 08086 E-mail:[log in to unmask] Web site:http://www.slackinc.com Some quesions on your paper: 1.Is gait a completely learned activity? 2.Isn't gait a genetically acquired capability? 3.Aren't there many motion control parameters other than visual flow? 4.How do blindfolded PWPs move? 5.Does your theory explain cogwheeling rigidity?