Synesthesia

1. Synesthesia

Synesthesia is a condition where the stimulation of a senation awakes another one. 

http://www.answers.com/topic/synaesthesia

2. grapheme-color synesthesia

Known as color synesthesia, where a person associates a number or letter with a color.

http://en.wikipedia.org/wiki/Grapheme%E2%80%93color_synesthesia

3. ordinal-linguistic personification   

Form if synesthesia where sequences or ordered months, days, numbers, or letters are associated with personalities.

http://en.wikipedia.org/wiki/Ordinal_linguistic_personification

http://upload.wikimedia.org/wikipedia/en/5/56/Stroop_interference.jpg

4. number-form synesthesia

Number-form synesthesia occurs when the person suffering from it thinks of numbers. It forma mental map of numbers involuntarily and automatically.

http://en.wikipedia.org/wiki/Number_form

5. sound-color synesthesia

In this type of synesthesia, when the person hears a certain sound they automatically think of a certain color in reaction to the first stimulus. It is sometimes described as "fireworks". 

http://en.wikipedia.org/wiki/Synesthesia#Sound_.E2.86.92_color_synesthesia

http://www.dopesciencery.com/wp-content/uploads/colorkeys.jpg

6. lexical-gustatory synesthesia

This is the rarest type of synesthesia, where  a specific word awakes a taste in the gustatory glands.

http://en.wikipedia.org/wiki/Synesthesia#Lexical_.E2.86.92_gustatory_synesthesia

http://www.macalester.edu/psychology/whathap/UBNRP/gcsynesthesia/two.jpg