<span>Gyri
and sulci are the folds and grooves,
respectively, which characterize the surface of the human brain.</span> Gyri
are part of the brain that shows a larger surface of the brain. When the gyri
change in structure or form it shows that a body is encountering sickness and
disorders. Sulci is one of the part of the cerebral cortex that surrounds the
gyri.
In an experiment, there are usually two groups that are taken and one is compared to another.
One group is the experimental group and the other group is the control group.
An experimental group is the one that receives the test sample or undergoes the experimental procedure and thus, the independent variable that is being tested for is changed for this group.
A control group is the one that does not undergo any experimental testing and hence, the independent variable is kept constant for this group.
Based on the above information it can be concluded that in the given experiment the rats that receiving leptin are the experimental group whereas those that do not receive anything are the control group.
