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oculo-agravic
oculo-agravic adj. 
/ˌɒkjᵿləʊeɪˈɡravɪk/, /ˌɑkjəloʊˌeɪˈɡrævɪk/ [ < oculo- comb. form + a- prefix6 + -gravic (in oculogravic adj.)] Physiology designating an illusion of movement of an object in the visual field, in the opposite direction to that of the oculogravic illusion, experienced during deceleration.
Brit. /ˌɒkjᵿləʊəˈɡravɪk/
, /ˌɒkjᵿləʊəˈɡravɪk//ˌɒkjᵿləʊeɪˈɡravɪk/U.S. /ˌɑkjəloʊəˈɡrævɪk/
, /ˌɑkjəloʊəˈɡrævɪk//ˌɑkjəloʊˌeɪˈɡrævɪk/ΘΚΠ
the world > physical sensation > sight and vision > thing seen > optical illusion > [adjective] > of upward movement
oculo-agravic1958
1958 Jrnl. Aviation Med. 29 504 We predicted an apparent motion under conditions of reduced gravity which would be opposite in direction to the one observed at increased accelerative force. This hypothetical phenomenon, which may be observed best in the zero-gravity state, is called the oculo-agravic illusion.
1961 H. G. Armstrong Aerospace Med. xv. 232/1 The authors attribute the oculoagravic illusion to an otolith response and noted that the direction of apparent movement of the image was the opposite of that expected from the previous work..on the oculogravic illusion.
1968 R. A. Weale From Sight to Light vi. 117 The oculo-agravic illusion has been studied by means of the apparent movement of an after-image.
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