Individuals with this form of synesthesia perceive organized categories and numerical sequences to have a specific location in the space around them.

Concepts like following are often described as occupying a precise spot that remains consistent 

• Months
• Weeks
• Years

People with this condition tend to have superior memories, recalling dates and historic events much better than can the average person.

 

It is hypothesized that areas of the brain involved are

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1. Parietal lobe - involved in numeric manipulation and coordinate systems,
2. Temporal lobe regions - implicated in sequence coding and visual object representation.