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Cued platform training reveals early development of directional responding among preweanling rats in the Morris water task
Author(s) -
Akers Katherine G.,
CandelariaCook Felicha T.,
Rice James P.,
Johnson Travis E.,
Hamilton Derek A.
Publication year - 2011
Publication title -
developmental psychobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.055
H-Index - 93
eISSN - 1098-2302
pISSN - 0012-1630
DOI - 10.1002/dev.20480
Subject(s) - cued speech , spatial learning , psychology , sensory cue , task (project management) , morris water navigation task , audiology , communication , cognitive psychology , neuroscience , cognition , medicine , management , economics
Previous studies on the ontogeny of spatial learning report that rats younger than 19–21 days of age are incapable of learning the location of a platform relative to distal cues in the Morris water task. Here, we manipulated the spatial relationship of a cued platform to the pool and the distal visual room cues to investigate whether distal cues can control navigation among 16‐ to 24‐day‐old rats. Rats were trained to navigate to a cued platform in a rich distal cue environment. During critical test trials, the pool was shifted to a different, overlapping position and the cued platform was placed either in the same absolute location in the room or the same relative location in the pool as during training. Rats aged 17 days and older exhibited a disruption in performance when the cued platform was in the absolute location but not the relative location, indicating that rats had learned the direction of the cued platform within the distal cue environment. These observations indicate that (1) information acquired from distal room cues influences navigation as early as 17 days of age, (2) this distal cue information is preferentially used to guide navigation in a particular direction rather than to a precise place in the room, and (3) the directional nature of the influence of distal cues on navigation is invariant across development. © 2010 Wiley Periodicals, Inc. Dev Psychobiol 53: 1–12, 2011.