Where am I? Distal cues use requires sensitivity to start location change in the rat.
Place learning is impaired when a single plus maze is moved between adjacent locations 33-120 cm apart. This maze translation creates distinct start locations but maintains a single goal location with respect to distal cues. Hippocampal cell recording data suggest the majority of place fields are tied to apparatus boundaries, not to distal cues, when an apparatus is moved these distances to the left or right. Thus, rats may fail to appreciate the existence of multiple start locations with respect to distal cues when the maze is moved in this way and their start location on the surface is constant. Performance on the single plus maze problem was improved when texture cues were correlated with different start locations. Place learning was supported when multiple start locations were provided on a single large surface (double plus maze), even though rats did not explore the entire surface. Place learning was also supported when random extensions were added to a double plus maze such that start locations, relative to surface boundaries, were not informative as to goal location. This outcome suggests sensitivity to multiple start locations is required for distal cue use in translational place problems.
Horne
Murray R
MR
Department of PsychologyMemorial University of Newfoundland, St. John's, NF, Canada.
Martin
Gerard M
GM
Harley
Carolyn W
CW
Skinner
Darlene M
DM
D000818:Animals; D003463:Cues; D008297:Male; D018782:Maze Learning; D051381:Rats; D020318:Rats, Long-Evans; D013037:Spatial Behavior