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Rats encode the shape of an array of discrete objects

Rats encode the shape of an array of discrete objects Brett M. Gibson 1 , Tyler J. Wilks 1 , Debbie M. Kelly 2 University of New Hampshire 1 University of Saskatchewan 2. Cheng, 1986. Work using discrete landmarks. People. Garrad-Cole, Lew, Bremner, and Whitaker, 2001.

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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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