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Optical Illusions: Difference between revisions
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== Troxler Effect == | == Troxler Effect == | ||
[[File:Lilac Troxler effect.gif|alt=Troxler effect|thumb|'''Figure 3'''. Troxler effect - looking at this long enough causes it to disappear.]] | [[File:Lilac Troxler effect.gif|alt=Troxler effect|thumb|'''Figure 3'''. Troxler effect - looking at this long enough causes it to disappear.]] | ||
Firmly fixating one's focus on a stationary object in the visual field can cause the surrounding visuals to appear to fade or slowly vanish ('''Figure 3'''). To demonstrate this, keep very still and keep your gaze focused on the central cross. Do not strain your eyes, but try not to let your gaze wander from the centre. | Firmly fixating one's focus on a stationary object in the visual field can cause the surrounding visuals to appear to fade or slowly vanish ('''Figure 3'''). To demonstrate this, keep very still and keep your gaze focused on the central cross. Do not strain your eyes, but try not to let your gaze wander from the centre. You will observe three different illusions: | ||
# A green disc running around the circle of lilac discs in place of the gap. | |||
# The green disc running around on the grey background, with the lilac discs having disappeared in sequence. | |||
# A gap running around the circle of lilac discs. | |||
=== Mechanism === | === Mechanism === | ||
The Troxler effect illustrates the importance of saccades, the involuntary movements of the eye which occur even while one’s gaze is apparently settled. | The Troxler effect illustrates the importance of saccades, the involuntary movements of the eye which occur even while one’s gaze is apparently settled. | ||