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2016 ; 10
(ä): 40
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The Representation of Three-Dimensional Space in Fish
#MMPMID27014002
Burt de Perera T
; Holbrook RI
; Davis V
Front Behav Neurosci
2016[]; 10
(ä): 40
PMID27014002
show ga
In mammals, the so-called "seat of the cognitive map" is located in place cells
within the hippocampus. Recent work suggests that the shape of place cell fields
might be defined by the animals' natural movement; in rats the fields appear to
be laterally compressed (meaning that the spatial map of the animal is more
highly resolved in the horizontal dimensions than in the vertical), whereas the
place cell fields of bats are statistically spherical (which should result in a
spatial map that is equally resolved in all three dimensions). It follows that
navigational error should be equal in the horizontal and vertical dimensions in
animals that travel freely through volumes, whereas in surface-bound animals
would demonstrate greater vertical error. Here, we describe behavioral
experiments on pelagic fish in which we investigated the way that fish encode
three-dimensional space and we make inferences about the underlying processing.
Our work suggests that fish, like mammals, have a higher order representation of
space that assembles incoming sensory information into a neural unit that can be
used to determine position and heading in three-dimensions. Further, our results
are consistent with this representation being encoded isotropically, as would be
expected for animals that move freely through volumes. Definitive evidence for
spherical place fields in fish will not only reveal the neural correlates of
space to be a deep seated vertebrate trait, but will also help address the
questions of the degree to which environment spatial ecology has shaped cognitive
processes and their underlying neural mechanisms.