Rats Don't Map Altitude

Rat neurons only weakly respond as the animals climbed upwards, suggesting the brain's map of the environment doesn't account for altitude.

Jef Akst
Jef Akst

Jef Akst is managing editor of The Scientist, where she started as an intern in 2009 after receiving a master’s degree from Indiana University in April 2009 studying the mating behavior of seahorses.

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In rats, neurons in and around the hippocampus— the region of the brain responsible for forming a map of the physical surroundings— only weakly respond to changes in altitude, according to a study published online yesterday (August 7) in Nature Neuroscience. Specifically, as the animals moved upwards along pegs on a climbing wall or up a spiral stair case, grid cells, which measure distance, only kept track of their horizontal movement, and did not appear to encode how high they were. Place cells, which denote location, did respond to changes in altitude, but only slightly.

“The implication is that our internal sense of space is actually rather flat—we are very sensitive to where we are in horizontal space but only vaguely aware of how high we are," Kate Jeffery, lead author from UCL Psychology and Language Sciences, said in a press release. “This finding is...

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