The other part of the illusion has to do with another bug in our visual programming: It's just that our cones can get tired.

(a)  

Cones sit near the retina's center, and detect fine detail and (a)   .

The visible light we're able to see is only a tiny chunk of the full (a)   spectrum.

Some stimuli, like really brilliant colors or really bright lights, are so strong that our photoreceptors will continue firing (a)   even after we close our eyes or look away.

The (a)   is the window that lets light into the eye.

Some produce ghost effects, or afterimages, that take advantage of glitches in the physiology of human (a)   .

The olfactory system is specialized to detect (a)  

Taste receptor epithelial cells bind to receptors that trigger (a)   to four different cranial nerves.

Chemoreceptors are used in the chemical senses of taste and (a)   to detect molecules in our food and the air around us.

You can taste that something is generally (a)   , but you can't tell the difference between a lemon and a lime.

Anosmia is caused by things as diverse as head (a)   , respiratory infections, and even plain old aging

The olfactory epithelium is coated in (a)  

The olfactory sensory neurons synapse with (a)   cells, which send signals to the brain.

Olivia suffered serious head (a)  

Anosmia is defined as a partial or complete loss of the sense of (a)  

The taste message is relayed through neurons via the seventh, ninth, and tenth (a)   nerves.

In order to taste a bite of pizza, those food chemicals, or tastants, must dissolve in (a)   so they can diffuse through those taste pores.