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Spatial Learning Ability of Male and Female Mice in Mazes

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PREPARED BY:

  • ELANCHELIAN A/ L THEVER
  • FARAH HANI BINTI MUNJIAT
  • NURUL FATINIZZATI BINTI ABD HALIM
  • LUCIA EMPINA HARRY
  • NURFAZRINA BINTI JAINULABADEEN

INTRODUCTION:

The house mouse (Mus musculus) is a small mammal of the order Rodentia, characteristically having a pointed snout, small rounded ears, and a long naked or almost hairless tail. House mouse can live together with humans. The house mouse has been domesticated as the pet and the laboratory mouse, which is one of the most important model organisms in biology and medicine.

House mice have an adult body length (nose to base of tail) of 7.5–10 cm and a tail length of 5–10 cm. The weight is typically 10–25 g. In the wild they vary in colour from light to dark agouti (light to dark brown) but domesticated mice and laboratory mice are produced in many colours ranging from white to champagne to black. They have short hair, ears and tail have little hair. The hind feet are short, only 15–19 mm long; the walking way is a run with a stride of about 4.5 cm, though they can jump vertically up to 45 cm. The voice is a high-pitched squeak. House mice can live under various conditions: they are found in and around homes commercial structures, open fields and agricultural lands.

New-born males and females can be easily distinguished. From the age of about 10 days females have five pairs of mammary glands and nipples; males have no nipples. When sexually mature the most striking and obvious difference is the presence of testicles on the males. These are large compared to the rest of the body and can be retracted into the body. Tail has only a thin covering of hair as it is the main peripheral organ of heat loss and used for balancing.

House mice usually run, walk, or stand on all fours, but when eating, fighting, or orienting themselves, they rear up on their hind legs with additional support from the tail. This behaviour known as tripoding. Mice are good jumpers, climbers, and swimmers, and are generally considered to be thigmotactic, means maintain contact with vertical surfaces.

Mice are mostly nocturnal. The average sleep time is 12.5 hours per day. Mice are territorial, and one dominant male usually lives together with several females and young. Dominant males respect each other's territory and normally enter another's territory only if it is vacant. If two or more males are housed together in a cage, they will often become aggressive unless they have been raised together from birth.

House mice primarily feed on plant matter, but are omnivorous. They will eat their own faeces to acquire nutrients produced by bacteria in their intestines. House mice, like most other rodents, do not vomit. Mice predators are rats which often kill and eat mice, a behaviour known as muricide.

Humans and rodents share some similar characteristics and genetic similarities since both are mammals. This makes rodents, especially mice, very suitable lab animals to conduct experiments that cannot be done on human beings. There are many types of maze that have been created for different type of studies, from classic maze, T-maze, radial arm maze, Barnes maze and even water mazes. These maze studies are used to study spatial learning and memory in mice. Maze studies have given tremendous help to study the general principles about learning for a better understanding not just in mice, but also other species including humans. There are a lot of maze studies conducted by various researchers who are curious to know whether different treatments or conditions affect learning and memory in mice. Our experiment is mainly focused on spatial learning ability between male and female mice in finishing the mazes.

OBJECTIVES:

I. To test the memory power of mice from both sexes

II. To find out the intelligence mice from both sexes to find out way to get the food

III. To find out which mice (male or female) learn faster

HYPOTHESIS:

Female mice will learn faster than the male mice.

MATERIALS:

MAZE:

  1. Glue
  2. Scissors/ Penknife
  3. Cellophane tape
  4. Boxes
  5. Transparent wrapping paper

USED IN THE EXPERIMENT:

  1. Biscuits (to lure the mice)
  2. Stopwatch (to record the time)
  3. Video camera/DSLR

PROCEDURE:

  1. 3 mazes with different patterns were made. There were simple, moderate and complicated pattern.
  2. The simple maze was labelled as A, moderate as B and the complicated one was labelled as C.
  3. Male and female mice were prepared.
  4. The foods were placed at the end of each maze. The foods used in this experiment were biscuits.
  5. The male mouse was released first into maze A.
  6. The time until the mouse reaches the food was recorded.
  7. 3 readings were recorded with 5 minutes interval for each reading.
  8. Then, the male mouse was released into the maze B followed by maze C and the readings were recorded for each maze.
  9. Step 5, 6, 7 and 8 were repeated by using the female mouse.
  10. The average time taken for each mouse to reach the food in different mazes was calculated.

RESULT:

 

1st Maze

2nd Maze

3rd Maze

1st Trial

1min 59s

2min 30s

12min 41s

2nd Trial

1min 8s

1min 28s

3min

3rd Trial

44s

2min 13s

3min 8s

Average

1 min 17 s

2 mi 4 s

6 min 27s

Table 1 shows time taken for a male mouse to complete 3 mazes with 3 trials.

The mazes consist of vertical walls and a transparent ceiling. The rat starts in one location, runs through the maze, and finishes in another location where they were rewarded with biscuits as treat. In the first maze, we can see that the time taken for the male to complete the maze decreases as the male attempted three trials. During the first trial, it took 1 minutes and 59 seconds for the male to reach the end for the first time. After a 5 minutes interval, we proceed with the second trial and found that the male agility improved as he took a shorter period to complete the maze, that is 1 minutes 8 seconds. The last trial for the first maze only took 44 seconds to be solved by the male mouse. Less time is needed to finish the maze as the male mouse learned better, and perhaps remember better from solving the first and second maze.

In the second maze, different trend can be observed. The time taken for the male mouse to complete the maze fluctuated between the first and second trial by 1 minute 2 seconds as what we assumed them to be. However, the male mouse took a longer time to finish the third trial. Instead of taking a shorter period to solve the maze, he took 45 seconds more of his time to reach the end. This is due to the mouse behaviour, where during the experiment was carried out in the maze, eventually he will stop to clean himself for a few times, which extended the time taken to complete the maze.

When we first introduced the third maze to the male, he took the longest time to finish the maze by taking up to 12 minutes 41 seconds before he finally reached the end. When the experiment was conducted, we observed that the male mouse took a longer time to explore the maze rather than trying to complete the maze to earn his treat as he was already satiated. There’s also up to a point when the male would not move at a certain place, as if he was resting or getting bored with the maze. There’s a huge different between the first and second trial of the third maze where the male only took about 3 minutes to complete the maze, with a slight increase when he finished the third trial by an increase of only 8 seconds.

 

1st Maze

2nd Maze

3rd Maze

1st Trial

43 s

33 s

32 s

2nd Trial

42 s

39 s

30 s

3rd Trial

50 s

37 s

35 s

Average

45 s

36 s

32 s

Table 2 shows time taken for a female mouse to complete 3 mazes with 3 trials

Figure 1 shows the average time taken by the male and female mouse to complete all three mazes

From Table 2, it is clear that the time taken for the female mouse to complete the maze of all three mazes did not decrease consecutively as what we have hypothesized. The first maze shows a slight decrease by merely one second between the first and the second trial, but increased to 50 seconds in the third trial. The same pattern can be observed in the third maze. The second maze shows a different pattern where the female mouse took a longer time to complete the second trial than the first trial. Eventually, the female mouse managed to solve the maze in a shorter period during the third trial compared to the second trial.

Comparatively, the female is a faster learner compared to the male mouse. From figure 1, we can analyse that in average, the female took a shorter time to solve all three mazes compared to the male. However, the extreme data obtained when the male completed the third maze could have affected the average time for the male mouse. Astonishingly, the more difficult the level of the maze, the shorter time was needed by the female mouse to complete the maze. The first maze is the easiest level, followed by the second and the third. This is different from the male, where the more difficult it gets, the longer time is taken to complete the maze, just like what we hypothesized for this experiment.

DISCUSSION:

Shorter time in maze completion by the female mouse than the male mouse shows that the female is a better learner. Sex differences in spatial learning ability and memory performance is proven in this experiment, with the female mouse as the better performer. This is supported by a research where mating system type predicts the presence of a sex difference in maze performance (Gaulin et al., 1989) since mice practices polygamy. According to Gaulin, sex differences in completing the maze are generally present in polygamous species but not in monogamous ones. Other factor that might influence the time taken to complete the maze could be due to the gender morphological difference. The male mice are usually bigger and heavier on their feet. Comparatively, the females are light bodied, which makes them to have better agility to solve the maze puzzle.

The level of difficulties also affects the mice performance to complete the maze. The number of junctions increases from maze A, followed by B and C. The more junctions in the maze, the more decision the mice have to make to reach the end of the maze, causing more errors especially during the first trial. Over multiple trials, mice tend to run the maze with fewer errors and quicker, hence a shorter time. The possible proximal causation is it could be because of the hippocampus is involved in the mice explicit memories (Edward D.L. ,Jerry J.B., 2006) which helps them to memorize the correct turns over multiple trials, enabling them to learn better by reducing the errors. Looking into their evolutionary history, mice, like other small burrowing rodents, have been digging and navigating their way around underground tunnels which are similar to mazes. Solving maze could be their natural ability since mice can navigate their ways through the maze.

Olfactory system functions as the sensory system which is to be used for sense of smell. Smell is important sense in many species as it is also for life quality. Throughout this experiment, the mice used their olfactory system to find their way out of the maze. Mice is a special animal whereby they only uses the sense of smell and touch in order to survive well in captivity as they do not need sight or hearing. A mouse actually does not see colour. In fact, black-and-white sight only enables the animals to easily spot movement. Even in the total darkness, the mouse relies on other senses, touch, hearing and smell. Besides of using its sensory smell, the mouse uses its whiskers to feel the way around. Food has been placed at the end of each different maze which each type of maze represents different level of difficulties. One of the ways that the mice used in order to escape the enclosed maze is to follow the scents of the food (biscuits). The food releases its scent which also called odorants (chemical molecules that stimulates the olfactory system) in the maze. Therefore the mouse follows the trail by using its olfactory senses where the odorants are detected by receptors which is located in the olfactory epithelium which then signalling to the hypothalamus and back to the muscles, which then allowing them to find the food in the end of the maze.

It is an ethologically relevant procedure that takes advantage of the mouse’s tendency to use olfactory cue to forage for food. Mice learnt the odour discrimination for 5 minutes. After 5 minutes being isolate from the maze, the mouse seemed to know where it has been throughout the maze which that explains the reason why the mouse got so fast in ending the maze. One of the ways that we observed throughout the experiment is the mouse also urinates in some of the mazes. This is because besides using the scent that the food has released, it follows the faint scent trail of urine to find its way to the finish line.

However, the result obtained could be bias since there are several factors that might have caused the mice to take long time to reach the end of the maze.

  1. Mice is satiated:

Since mice already satiated, they does not attracted or interested to the food. In some observation, the mice show behaviour where they only see the food from few centimetres from them. Besides, they didn’t go to get the food until a few second after they show this behaviour. Then, they just go close to the food but did not eat the food.

  1. Mice suddenly sit down to start to clean themselves:

Most of the observation, mice suddenly sit down and start to clean up themselves. This behaviour repeatedly occurred in some observation; maybe they become tired and not interested in running in the maze.

  1. Mice urinate and defecate:

Sometimes, mice urinate and defecate in the maze. This factor will affect the time taken of the mice to reach end of maze. It is either they become disturbed with the scent of their own excretion or use it as an advantage to trail the end of maze.

  1. Error that we encountered during handling this experiment:

The first error that occurred in this experiment was when the mice did not want to approach the food and ended up resting in the maze. This may be because the mice were not hungry. The second error is that the mice tend to give up in finding food. This error might occur because the mice get tired or maybe because the pathway was long.

The third error was accuracy in recording the time. At some time, we recorded the starting time and ending time slightly shorter or longer from the exact time since we got distracted in watching the mice in the maze. The next error was wrong selection of food. At first, we placed grain at the end of maze and we found out that the mice didn’t seem to be attracted to it. Then, we decided to put biscuits instead of the grains. The mice turned out to get attracted to the biscuits.

Other error that occurred was the materials that we used to make the maze. The mazes were made by using the boxes, which absorbs the urine of the mice and release bad odor. This odor caused the mice to get distracted.

The last error that we encountered in this experiment is that the environment during the experiment and the way in handling the mice. This experiment was conducted in a bright room. This may be the reason the mice do not wanted to come out from the box where they were placed since mice are sensitive to light. And also, the way we handled the mice could be one of the reason the mice stayed inside the box. Maybe the way we handled the mice were not that proper, causing them to think that we might harm them.

Precautionary steps and suggestions

  1. Do not give the mice any food one day before experiment start. This is to starve them, making them to be attracted and interested to the food placed at the end of maze. Therefore, mice will take less time to reach end of the maze.
  2. Studies show that playing classical music will increase their learning abilities. Mice exposed to classical music will take shorter time to reach the end of the maze.
  3. Clean up faeces and urine of the mice might help to reduce the time taken of mice to reach end of maze. Besides, mice can detect the scent of the food effectively without being disturbed by the scent of their own excretion. We should have used more suitable materials to make the maze such as plastic-based materials or polystyrene so that the urine of the mice will not be absorbed. We can also clean the maze if these materials were used. No bad odour and no disturbance for the mice in finding the food.
  4. Do the experiment in an environment that is conducive for the mice. Mice always prefer dark environment. We should also practice the correct ways in handling the mice.
  5. Other than that, this experiment should be done by at least 3 people at a time so that the time can be recorded more accurately as there are more people to observe the mice in the maze.

REFERENCES:

  1. Edward D.L. and Jerry J.B. (2006). Animal Models of Cognitive Impairment. Boca Raton, FL: CRC Press. Retrieved from http://books.google.com.my/books?id=VRi-mHJDOVsC&printsec=frontcover#v=onepage&q &f=false on 17th May 2014
  1. Steven J.C. Gaulin & Randall W. Fitzgerald (1989). Sexual selection for spatial-learning ability. Anim. Behav. 37: 322- 331

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