Navigation in Mammals Flashcards
What is a cognitive map?
Tolman (1948) coined the term cognitive map
= An internal representation (or image) of an external environmental feature or landmark
He thought that individuals acquire large numbers of cues (i.e., signals) from the environment and could use these to build a mental image of an environment (i.e., cognitive map)
What did Tolman suggest based on his experiments?
Rats have cognitive maps inside their brains
-have an internal representation of different objects and where they are located in the environments
-understand the relationship between different places and how one could move between them
Why was Tolman’s suggestion controversial?
Because it suggested that rats have a high cognitive ability that goes beyond the simple stimulus-association responses that were suggested at the time (pavlov)
What did Tolman (1948) investigate?
Tolman built a sun-burst maze consisting of 20 arms projecting from a hub in a pattern resembling sunbeams spreading across the sky to study cognitive maps
Describe Tolman’s experiments
Rats were trained to follow a particular route in a sunburst maze from the start to a designated goal
The original route was then blocked and the animals had to choose an alternative path, only one of which pointed toward the goal box
Describe Tolman’s findings from the choice apparatus in the sun-bust maze
The fact that many rats chose the arm that led to the location of the goal box was taken as evidence that they understood the spatial relation between the start and the goal and could take the shortest path to get there
What does Tolman’s sun-burst maze demonstrate?
That the rats have some kind of representation inside their brain of the location of the goal and they choose the correct path
Describe another of Tolman’s mazes
Rats starts at the bottom end and can explore the maze, there are three ways to get to the food reward at the end
Straight = shortest route, then left route is next shortest, then the right route is longest route
What happens when the path straight forward (shortest route) is blocked?
If it has a cognitive map of the maze based on previous exploration, it would know that the path to the left is shorter and faster than the path to the right
-it was found that rats tended to prefer going left
Simple stimulus-response was not trained in this situation and so is not something the rat would be able to infer based on simple pavlovian conditioning
How is the cognitive map different to insect navigation? (circular navigation)
In the sun-burst maze, the circular platform is not the nest
The rats are able to do this navigation without relying on any specific point which is the centre of the coordinates like the nest or hive are for the ants and bees, but rather it is something arbitrary
What distinguishes between cogntive maps and insect navigation? (Insects visual memory - retinotopic)
Insect visual memory is believed to be of the ‘retinotopic’ panoramic view rather than of individual objects
Rats don’t rely on a panoramic view - we know this because you can take away objects and replace them in the rats room but the rat would still understand that the room is the same room
What distinguishes between cognitive maps and insect navigation? (Insect view memory & path integration are independent)
There is evidence that the insect view memory and path integration systems are independent (a path integration error will not be corrected because of being in place with familiar view)
In rats, there are some behavioural experiments that show it is the opposite, rats can correct its path integration based on what it sees and perceives around it
What distinguishes between cognitive maps and insect navigation? (Ability for performing shortcuts in insects is questionable)
Bee- from the hive goes to location A based on the waggle dance, if it doesn’t find food here but knows there is food at location B, will it take the shortcut and go from A-B rather than back to the hive and then to B?
This shortcut would be a type of vector calculation that can be done potentially in the geometric system
Its possible just by summing vectors to calculate this shortcuts
High level of complexity that insects cant seem to do
But in mammals there are experiments that show that mammals are able to take this shortcut
Why is it difficult to demonstrate that animals take shortcuts?
- The shortcut must be novel
- Other strategies should be excluded
- Path integration
- Beaconing
- Route following
Explain Harten, Katz, Goldshtein et al. (2020)
Attached GPS trackers to bats
Researchers tracked where the bats fly
Bats fly to some fruit trees surrounding the colony
Sometimes you can see a shortcut between fruit trees where the bat went straight from one tree to another without returning to the colony first
Made sure there was no highway which the bats were following for light to rule out route following and beaconing