Key result
Inducing sympathetic activity via cold-pressor and amyl nitrite inhalations caused a consistent decrease in the apparent size of a distant object relative to a nearer object.
Authors
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May reduce visual size constancy under sympathetic activation; hypothesis-generating for autonomic effects on perception in stress-related conditions.
Increased sympathetic activity may decrease exteroceptive input, leading to narrowed awareness and reduced size constancy in visual perception.
Callaway et al. (1953) studied this question. Cold-pressor procedure and amyl nitrite inhalations was evaluated on Changes in visual perception (apparent size of a distant object relative to a nearer object). Inducing sympathetic activity via cold-pressor and amyl nitrite inhalations caused a consistent decrease in the apparent size of a distant object relative to a nearer object.
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