Morris Water Maze (Reversal)

LSID: http://syli.cz/urn:lsid:public.sylics.com:conventionaltest:6E48-B96E-G7A2

Materials and Methods
Mice were singly housed on sawdust in standard Makrolon type II cages enriched with cardboard nesting material for at least one week prior to experiments, with water and food ad libitum (7:00/19:00 lights on/off; providing an abrupt phase transition).

Associated Mammalian Phenotype Ontologies (MGI)
- MP:0002063 abnormal learning/memory/conditioning

Morris Water Maze
Spatial memory was tested in a Morris water maze setup. Before testing, mice were handled for at least 5 days, until they did not try to jump of or walk from the experimenters hand. A circular pool (diameter 125 cm) was filled with water (30 cm below the rim) which was painted white with non-toxic paint and kept at a temperature of 25 degrees C. An escape platform (diameter 9 cm) was placed at 30 cm from the edge of the pool submerged 1 cm below the water surface. Visual cues were located around the pool at a distance of ca. 1.5 m. During testing lights were dimmed and covered with white sheets and mice were video-tracked using ViewerII (Viewer 2, BIOBSERVE GmbH, Bonn, Germany). Mice were trained for 5 consecutive days, 2 sessions of 2 trials per day with a 1-3 min inter-session interval. In each trial, mice were first placed on the platform for 30 s, and then placed in the water at a random start position and allowed a maximum of 60 s to find the platform. Mice that were unable to find the platform within 60 s were placed back on the platform by hand. Within each 2-trial session, after 30 s on the platform mice were tested again. On day 5 or 6 a probe trial was performed with the platform removed. Mice were placed in the pool opposite from the platform location and allowed to swim for 60 s. During training trials, the latency, distance and speed to reach the platform were measured; in the probe trial, the time spent and distance traveled in each quadrant of the pool were measured, as well as the number of platform-zone crossings.

Parameter information
Parameter nameUnits
Probe: Time spent per quadrant (last 30s)time (s)
Probe: Time spent in platform quadrant (first 30s)time (s)
Probe: Time spent per quadrant (first 30s)time (s)
Probe: Platform zone crossingsFrequency
Probe: Distance traveled in platform quadrantdistance (cm)
Probe: Distance traveled per quadrantdistance (cm)
*Reversal acquisition: Latency to platform per daytime (s)
*Probe: Time spent in platform quadranttime (s)
Probe: Time spent per quadrant (60s)time (s)
Reversal acquisition: Distance to platform per daydistance (cm)
Reversal acquisition: Average velocity per dayvelocity (cm/s)
Probe: Platform crossings per zoneFrequency
Probe: Platform crossings per zone (last 30s)Time (sec)
Probe: Platform crossings per zone (first 30s)Time (sec)
Probe: Time spent in platform quadrant (per 30s)time (s)
Probe: Time spent in platform quadrant (last 30s)time (s)