The Scientific Procedures Act (1986) states that researchers must have a

allowing them to experiment on animals. They must be appropriately

to use anaesthetics. The animal must be monitored and

kept to a minimum. Committees will consider

Decision Cube (1986), consisting of

benefit, quality of

and the degree of animal

This involves a measurement of

or more variables to establish a

without manipulation variables. These are useful for when manipulating variables would be

for example with

et al's research in 2000, investigation the relationship between the volume of

in the hippocampus and length of time participants spent working as

If a positive correlation is found, this means that as one variable increases, the other

at the same rate. If a negative correlation is found, this means that as one variable increases, the other

at the same rate. Data sets are plotted on a

graph, and the correlation

is calculated.