Portal de Periódicos da CAPES

PERCEPTION OF VERTICALITY WITH A ROD AND FRAME APPARATUS

1971; Lippincott Williams & Wilkins; Volume: 48; Issue: 8 Linguagem: Inglês

10.1097/00006324-197108000-00006

1538-9235

Jin Ong, Dorothy J. Kessinger,

Spatial Cognition and Navigation

Effects of frame tilt and head tilt on the perceived vertical were investigated. Twenty-five male subjects aligned the rod to vertical while the frame was erect or tilted, and while the head was tilted. Results showed, first, a highly significant difference in the perceived vertical between the frame erect and tilted, with head erect, but no difference between head erect and tilted, with frame erect, implying that visual factor was more dominant than the postural; and, second, that a bare frame is sufficient to serve as a visual framework for the perception of verticality regardless of whether the visual field or peripheral cues are present, and that a relatively small size frame can serve just as well. Thus it may mean that the whole visual field is not necessary in the perception of verticality, and all that is needed is a kind of visual-anchor.