Segregation of visual features is not the basis of visual orientation relative to gravity.
Eggert
T
T
Max-Planck Institut für Verhaltensphysiologie, Abteilung Mittelstaedt, Seewiesen, Germany.
D006112:Gravitation; D006801:Humans; D009949:Orientation; D010364:Pattern Recognition, Visual; D011187:Posture