Nach mei­nem letz­ten Bei­trag zu »Die Wahr­neh­mung ist rela­tiv« habe ich soeben eine wahre Fund­grube ganz ähn­li­cher Phä­no­mene im Netz gefunden:

60 Opti­cal Illu­si­ons & Visual Pheno­mena
(Visual Illu­si­ons – Opti­sche Täu­schun­gen) by Michael Bach, Uni­ver­sity of Frei­burg, Ger­many
Ein­fach mal bei michaelbach.de/ot/ vor­bei­schauen. Ach ja, man sollte aber schon einen aktu­el­len Flash­player haben um die Sachen zu sehen…

Motion & Time

• »Step­ping feet« illu­sion 1 – strong, beau­ti­ful and (rela­tively) easy to understand
• Motion Indu­ced Blind­ness – an unex­plai­ned opti­cal illu­sion of disap­pearing dots
• Ste­reo­ki­ne­tic Pheno­me­non – an opti­cal illu­sion of 3D from motion (aka »kine­tic depth effect«)
• »Rota­ting Snake« Illu­sion – with a new expla­natory twist
• Pinna-Brelstaff Illu­sion
• Motion After­ef­fect – also known as »water­fall effect«
• Spoke Illu­sion – a motion illu­sion + an unex­pec­ted (?) aftereffect
• Stro­bo­sco­pic Arti­facts – making a teaching point out of a nuisance
• Sigma Motion – an opti­cal illu­sion due to an inter­ac­tion of image dyna­mics and eye movements
• Eye Jit­ter – more on eye move­ments, invol­un­tary ones
• Bio­lo­gi­cal Motion – for me the most beau­ti­ful class of visual illusions
• Flash-lag Effect – moving and sta­tio­nary objects per­cei­ved at dif­fe­rent times
• Ramp After­ef­fect – an after­ef­fect in time
• Enigma by Isia Leviant
• Reverse Phi Motion – some­thing for the specialist
• »Step­ping feet« illu­sion 2 – radial ver­sion of »Step­ping feet 1«, weaker
• Motion-Bounce Illu­sion – sound influ­en­cing per­cep­tion of motion (crossmodally)
• Motion Bin­ding
• Missing-fundamental motion inversion
• Frequency-doubling illu­sion

Lumi­nance & Contrast

• Hermann’s Grid – flee­ting lumi­nance illusions
• Hermann’s Grid bent – a new twist, refu­ting the clas­si­cal explanation
• Scin­til­la­ting Grid – strong flee­ting lumi­nance illusions
• Indu­ced gra­ting – clas­si­cal bright­ness contrast
• Craik-O’Brien-Cornsweet – col­la­bo­ra­tion of retina & cortex
• Wertheimer-Koffka-Ring – pit­ting Gestalt vs. late­ral inhibition
• Simul­ta­neous Con­trast – here dynamic
• Pyra­mid Illu­sion – Vasa­rely revealed
• Munker-White Illu­sion – con­trary to late­ral inhibition
• Adelson’s »Corru­ga­ted Plaid« – con­text affec­ting brightness
• Adelson’s »Che­cker Shadow« illu­sion – more con­text affec­ting brightness
• Con­trast Con­stancy – demons­tra­ting space-average-based con­trast gain control
• Con­trast Gain Con­trol – demons­tra­ting tem­po­ral con­trast gain control

Colour

• »Lilac Cha­ser« – a rapid after­ef­fect, you pur­sue colours which aren’t really there
• Benham’s Top – colour from spatio-temporal patterns
• Neon Colour Spreading
• Struc­ture from motion – fails at equiluminance

Geo­me­tric– & Angle Illusions

• Hering Illu­sion – and other angu­lar interactions
• Pog­gen­dorff Illu­sion – a clas­si­cal geo­me­tric opti­cal illu­sion with a new twist
• Fraser’s Spi­ral
• »Café Wall« Illusion

Size Con­stancy

• Müller-Lyer Illu­sion – test your bisec­tion accuracy
• Moon illu­sion
• T-illusion
• Lumi­nance Looming
• She­pard: »Turning the Tables«
• She­pard: »Sub­ter­ra­nean Terror«

Cogni­tive– / Gestalt Effects

• Blur & pic­ture con­tent – spa­tial fil­te­ring (or high fre­quency masking)
• Hid­den mes­sage – blur & figure-ground discrimination
• Kanisza’s Tri­angle – depends on context
• Blot­ted let­ters – Gestalt completion
• Hid­den Figu­res – Dal­ma­tian Dog with 2 helpers
• Rota­tion – chan­ges the interpretation
• Impos­si­ble Objects – draw your own impos­si­ble object

What’s spe­cial about faces?

• Rota­ting face mask – hol­low faces
• Find the Face (in the Beans) – a pic­ture puzzle
• The face on Mars – ima­gi­na­ti­ons of perception
• The »That­cher Illu­sion« – inver­ted faces lose their emo­tio­nal message
• Dr. Angry and Mr. Smile – two mes­sa­ges in two spa­tial fre­quency band
• The Lin­coln Effect