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2018 ; 28
(7
): 1005-1015.e5
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Accuracy of Rats in Discriminating Visual Objects Is Explained by the Complexity
of Their Perceptual Strategy
#MMPMID29551414
Djurdjevic V
; Ansuini A
; Bertolini D
; Macke JH
; Zoccolan D
Curr Biol
2018[Apr]; 28
(7
): 1005-1015.e5
PMID29551414
show ga
Despite their growing popularity as models of visual functions, it remains
unclear whether rodents are capable of deploying advanced shape-processing
strategies when engaged in visual object recognition. In rats, for instance,
pattern vision has been reported to range from mere detection of overall object
luminance to view-invariant processing of discriminative shape features. Here we
sought to clarify how refined object vision is in rodents, and how variable the
complexity of their visual processing strategy is across individuals. To this
aim, we measured how well rats could discriminate a reference object from 11
distractors, which spanned a spectrum of image-level similarity to the reference.
We also presented the animals with random variations of the reference, and
processed their responses to these stimuli to derive subject-specific models of
rat perceptual choices. Our models successfully captured the highly variable
discrimination performance observed across subjects and object conditions. In
particular, they revealed that the animals that succeeded with the most
challenging distractors were those that integrated the wider variety of
discriminative features into their perceptual strategies. Critically, these
strategies were largely preserved when the rats were required to discriminate
outlined and scaled versions of the stimuli, thus showing that rat object vision
can be characterized as a transformation-tolerant, feature-based filtering
process. Overall, these findings indicate that rats are capable of advanced
processing of shape information, and point to the rodents as powerful models for
investigating the neuronal underpinnings of visual object recognition and other
high-level visual functions.