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Lottery Method Essay

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Young adults (10 woman, 10 men, Mage = 20 years, age range 18-22 years) were recruited by posting flyers in the student union of Carthage College campus. Older adults (10 woman, 10 men, Mage = 60 years, age range 58-62 years) were recruited by an add posted in a local newspaper. Test subjects for the study were randomly selected from volunteers whom had shown interest using the lottery method. Selection included assigning each volunteer (divided by groups of age and gender) a unique number. From there the numbers were placed in a hat and four trials of selection were used for five members of a certain age group and gender. Two control groups were made using equal amount of participants from each gender (same age group). …show more content…
After ensuring that the participants were aware of the research requirements, they were asked to sign the informed consent form. The lottery method was again utilized to randomly place subjects into either the stimulated or non-stimulated group. Participants of both groups were matched according to their age group.
Participants were then informed that they would be performing a Dual N-Back task in order to test their working memory. The Dual N-Back task followed the same procedure throughout the experiment. The first step of the procedure was for the participants to initiate the test by pressing the space key on the keyboard. After the test had been initiated a blue square was displayed in one of the nine possible positions accompanied by an audio output of a single letter for 500 ms. Another sequence of visual and audio stimuli followed after 700 ms. In total ten trials of stimulus were presented to the subjects. When the audio stimulus matched the audio stimulus presented two trials previously the subjects were instructed to press the L key. If the position of the visual stimulus matched the position presented two trials previously the subjects were instructed to press A. Otherwise if neither of the stimulus matched that of the stimulus presented two trials previously the subjects were instructed not to press any key. Each Dual N-Back test was separated by a one

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