If we have learned to solve problems by one method, we often have difficulty bringing new insight to similar problems. However, electrical stimulation of the brain appears to help subjects come up with fresh insight.
In a recent experiment1 conducted at the University of Sydney in Australia, 40 participants were trained to solve problems in a certain way and then asked to solve an unfamiliar problem that required fresh insight. Half of the participants were randomly assigned to receive noninvasive electrical stimulation of the brain while the other half (control group) received sham stimulation as a placebo. The participants did not know in which group they were. In the control group, 20% of the participants successfully solved the problem while 60% of the participants who received brain stimulation solved the problem.
(a) Is this an experiment or an observational study?
(b) From the description, does it appear that the study is double-blind, single-blind, or not blind?

The difference between a single-blind study and double-blind study is that, in a single-blind study, the participants in the clinical trial do not know if they are receiving the placebo or the real treatment but the experimenter knows while in a double-blind study, both the participants and the experimenter do not know which group got the placebo and which got the experimental treatment.

From the description of the experiment, half of the participants were randomly assigned to receive noninvasive electrical stimulation of the brain by the experimenter while the other half (control group) received sham stimulation as a placebo. This implies that the experimenter knows the group that receives the placebo but the participants did not know which group they were. Therefore, the study is a single-blind study.

bratislava bratislava · Answer 2 · 2022-02-01T17:08:34+01:00

The experiment was conducted at the University of Sydney.

As per the question they learned to solve the problems one by one as the brain learns the method and often faces with similar problems and develops a newer insight the electrical stimulation appears to be helpful subjects come with a few insights.

Hence the answer is the Experimental method and the Single-Blind Study.

The experiment's method includes the X and Y variables and thus are carried out in support of the hypothesis and determine the efficiency of the likelihood of the situation as that give us the cause and effect of the situations and highlight the problems.

The single-blind method is used for the participants that make and kept ignorant and the group may be either assigned key information about the materials. The experiment takes possession of the knowledge.

Learn more about the learned to solve the problem.

brainly.com/question/14701214.