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"Perhaps," he conjectured, "our rats perceived that the positions of these white dots represented their head directions".
Image caption: For the experiment, researchers projected various shapes to act as landmarks onto a planetarium-like dome over a track and moved the shapes either in the same direction as the rats or in the opposite way, creating an augmented reality environment where rats perceived themselves as running slower or faster than they actually were.
In other words, rats perceived as less negative the originally learned negative, discontinuous pattern, when compared to a novel continuous pattern (the grating) with the same orientation.
By contrast, the shapes that rats perceived as being more similar to the hourglass-looking pattern were those that looked more "open" (i.e., more spread-out, with a lot of contour and projections), such as crosses, Hs, Us, etc.
The shapes that rats perceived as being more similar to the diamond-like pattern were those that, qualitatively, looked more as "closed" (i.e., more compact and without protruding elements), such as circles, ellipses, triangles and squares.
This produced a drop in rat performance (see middle bar in Fig. 3D) that led Gaffan and Simpson to conclude "first, that rats perceived the objects as distinct shapes, not as luminous blobs, and second, that they encoded them in terms of visual features that are common to a class of shape" [147].
Similar(53)
Rats perceive both distal and proximal cues in active place avoidance but only the distal cues provide information needed to avoid the shock zone [11].
These data indicate that rats perceive 2D space and that this information influences synaptic plasticity processes in the hippocampus.
These tasks effectively require a rat to respond on one lever if a signal is detected, but respond on another if the rat perceived no signal to be presented.
They initially trained rats to discriminate between an "open" and a "close" shape (respectively, a diamond-like and a hourglass-like silhouette, either horizontally or vertically oriented), and then measured rat perceived similarity between each of 20 new transfer shapes and the originally trained shapes.
First, only few shapes were tested and very few trials were collected per shape (10 trials, in the transfer experiment with single-shape presentation), thus greatly limiting the accuracy of the measurement of rat recognition performance and, therefore, of rat perceived similarity between transfer and trained shapes.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com