Sharp Brains: Brain Fitness and Cognitive Health News

Neuroplasticity, Brain Fitness and Cognitive Health News


#8. Test your Brain with these 10 Visual Illusions

The brain has two hemi­spheres, each divid­ed into four lobes. Each lobe is respon­si­ble for dif­fer­ent func­tions. For instance the frontal cor­tex (in blue below) is respon­si­ble for deci­sion mak­ing and plan­ning; the tem­po­ral lobe (in green) for lan­guage and mem­o­ry; and the pari­etal lobe (in yel­low) for spa­tial skills. The occip­i­tal lobe (in red) is entire­ly devot­ed to vision: It is thus the place where visu­al illu­sions hap­pen.

top 10 visual illusions

The frontal lobe rep­re­sents around 41% of total cere­bral cor­tex vol­ume; the tem­po­ral lobe 22%; the pari­etal lobe 19%; and the occip­i­tal lobe 18%. How the visu­al sys­tem process­es shapes, col­ors, sizes, etc. has been researched for decades. One way to under­stand more about this sys­tem is to look at how we can trick it, that is, to look at how the brain reacts to visu­al illu­sions.


10 visu­al illu­sions to com­bine fun and learn­ing about the visu­al sys­tem (You’ll find answers and expla­na­tions at the end of the arti­cle)

We know you know there is a trick since these are illu­sions… but don’t try to be smarter than your brain: Just enjoyed being tricked!

1. Are the squares inside the blue and yel­low squares all the same col­or?

square color illusion test


2. Are the hor­i­zon­tal lines straight or crooked?

café wall optical illusion


3. Are the cir­cles sta­t­ic or mov­ing?

circle motion illusion test


4. How many legs does this ele­phant have?

elephant visual illusion test


5. Can you put the fish in the fish­bowl?

Stare at the yel­low stripe in the mid­dle of the fish in the pic­ture below for about 10–20 sec. Then move your gaze to the fish bowl.

fish bowl illusions test


Keep read­ing to try the next 5 illu­sions

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7 Responses

  1. Steven says:

    Most of these are old, but some I haven’t seen before. I absolute­ly love opti­cal illu­sions.

  2. T.L. says:

    Awe­some! I like being tricked even when I know its hap­pen­ing. Too cool.

  3. Geroboam says:

    Old sal­sa.

  4. Lenny says:

    These are pret­ty neat!!! I am always so fas­ci­nat­ed by opti­cal illu­sions!!

  5. T. H. says:


  6. Pascale says:

    Hi T.H., There is noth­ing spe­cial to be seen in Escher’s draw­ing. It is a great exam­ple of an impos­si­ble object, just for your eyes’ plea­sure!

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