Experimental psychology Essay

This essay has a total of 301 words and 2 pages.

experimental psychology



Chapter 9 talks about the importance of a factorial design and its efficiency in testing
two or more factors in an experiment. It can also be used to measure main effects and
interactions, which make it a major element in psychology by providing valuable
information that other experiments cannot. Factorial designs can be described or assessed
by shorthand notations and statistics. If their are 4 numbers that means there is 4
factors and the levels of these factors are based on the value of these numbers. Stats are
then used to determine the effect in a design. There are some limitations however, such as
the requisite for many subjects. The experiments themselves may be extremely long and
require arduous statistical procedures. Chapter 10 talks about within-subject designs that
allow each subject to be part of a number of conditions in an experiment. The main
advantage to this is that it allows us to compare the behavior of the same subjects under
different treatment conditions. It does have its problems though such as control problems,
in which we have to control a couple of different variables, such as order effects and
carryover effect. Order effects are the positive and negative changes in performance that
occur in a different number of treatments. We can control this in a different number of
ways such as counterbalancing in which we distribute the progressive errors across the
different treatments in the experiment. Another way is by subject-by-subject in which we
control the error for each individual rather than the entire treatment. Adding all the
individual error data for each condition can also use across-subjects counterbalancing.
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