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Rats encode the shape of an array of discrete objects

This study investigates how rats perceive and encode the geometry of discrete object arrays. Using landmark-based approaches and various geometric tests, the research reveals that rats primarily encode the overall shape rather than relying on local cues or specific feature arrangements. Experimentation shows the rats make choices based on the geometry of the object configuration, highlighting the importance of spatial arrangement in their decision-making process. The findings suggest that while local features are noted, they are less significant than the geometric layout for the rat's navigation and memory.

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Rats encode the shape of an array of discrete objects

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  1. Rats encode the shape of an array of discrete objects Brett M. Gibson1, Tyler J. Wilks1, Debbie M. Kelly2 University of New Hampshire1 University of Saskatchewan2

  2. Cheng, 1986

  3. Work using discrete landmarks People Garrad-Cole, Lew, Bremner, and Whitaker, 2001 Gouteux and Spelke, 2001 Rats Greene and Cook, 1998 Behamou and Poucet, 1998 Skov-Rackette and Shettleworth, 2005 Esber, McGegor, Good, Hayward, and Pearce, 2005

  4. F F R R C C N N Experiment 1 N

  5. Acquisition: First six sessions

  6. 0 1.0 0 0 C F Geometry Test .11 .33 .42 .22 N R C F Acquisition (last block) N R

  7. .04 .08 .08 .79 C F 0 1.0 Water Control 0 0 N R C F Diagonal Test N R

  8. .10 .55 .15 .20 C F Expansion Test N R

  9. C F N C Experiment 2 N F C C N

  10. Acquisition

  11. .05 .42 .11 .58 C IC Control: Second Session .05 .40 .05 .50 IC C C IC Control: First Session IC C

  12. .17 .35 .09 .39 C IC Expansion Test IC C

  13. Are the rats using local cues? C IC IC C

  14. .36 .23 .41 C IC Incorrect Object Removal Test .32 .32 .36 IC C C IC Correct Object Removal Test IC C

  15. Conclusions • Rats appear to encode the geometry of an array of • discrete objects • Choices not based on the use of local cues • The features of objects that form the shape matter • The exact arrangement of features in an array may not • be so important

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