Analyzing the Impact of Glucose on Students' Listening Span
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Drinking glucose improves listening
span in students who miss breakfast
Classifying the Design
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Think :
What are the features of a true
experiment?
Features of an Experiment
The experimenter manipulates at least one IV. A DV is
used to measure the effects of the IV.
4 characteristics of true experiments:
1 – MANIPULATION
2 – MEASUREMENT
3 –COMPARISON
4 – CONTROL
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Interpreting the Results
1)
How would you rate the internal validity of
this experiment? Explain.
Internal Validity
Extent to which other causes are ruled out—
extent to which the difference in behavior can
unambiguously be attributed to the manipulation
A researcher's ultimate goal: “This is what
happened, and this is what it means.” Any factor
that raises doubts about the research results or
about the interpretation of the results is a
THREAT TO VALIDITY.
Interpreting the Results (cont.)
2)
What can we conclude from the results?
3)
Describe some threats to internal validity
in this experiment.
Glucose
levels
4.60 4.68
4.60 4.62
Safeguarding Internal Validity
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Two ways to check the manipulation:
(1) An explicit measure of the IV **Relevant here**
2) Ask specific questions about the manipulation after the
experiment
Application
Based upon this study, what would your answer be to peers
wondering about the impact of a good breakfast on their
course performance?
An update
Morris, N. (2008). Elevating blood glucose level
increases the retention of information from a
public safety video.
Biological Psychology, 78
,
188-190.
doi:
10.1016/j.biopsycho.2008.02.008
Percent memory recall by blood
glucose level
What type of design is employed?
•
ANOVA results for blood glucose levels
•
ANOVA results for memory recall
Back to……
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Research presented by Dr. Christine Malone explores how drinking glucose can enhance listening span in students who miss breakfast. The study investigates if the experiment qualifies as a true experiment by analyzing key features like manipulation, measurement, comparison, and control. Internal validity is assessed based on how well the study rules out other potential causes and attributes differences in behavior to the manipulation of the independent variable. The interpretation of results, glucose levels, and threats to internal validity are discussed, emphasizing the importance of safeguarding against biases. The application of the study suggests a potential link between a good breakfast and improved course performance among peers.
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Presentation Transcript
Drinking glucose improves listening span in students who miss breakfast Morris & Sarll Presented by Dr. Christine Malone
Classifying the Design Classifying the Design Does this study qualify as a true experiment Yes or No? Think : What are the features of a true experiment?
Features of an Experiment Features of an Experiment The experimenter manipulates at least one IV. A DV is used to measure the effects of the IV. 4 characteristics of true experiments: 1 MANIPULATION 2 MEASUREMENT 3 COMPARISON 4 CONTROL Let s take one minute to summarize the study, being sure to include each of the above characteristics.
Interpreting the Results Interpreting the Results 1) How would you rate the internal validity of this experiment? Explain.
Internal Validity Internal Validity Extent to which other causes are ruled out extent to which the difference in behavior can unambiguously be attributed to the manipulation A researcher's ultimate goal: This is what happened, and this is what it means. Any factor that raises doubts about the research results or about the interpretation of the results is a THREAT TO VALIDITY.
Interpreting the Results (cont.) Glucose levels 4.60 4.68 4.60 4.62 2) What can we conclude from the results? 3) Describe some threats to internal validity in this experiment.
Safeguarding Internal Validity Manipulation Check--A measure to see whether the independent variable has the intended effect on the participant. Two ways to check the manipulation: (1) An explicit measure of the IV **Relevant here** 2) Ask specific questions about the manipulation after the experiment
Application Based upon this study, what would your answer be to peers wondering about the impact of a good breakfast on their course performance?
An update Morris, N. (2008). Elevating blood glucose level increases the retention of information from a public safety video. Biological Psychology, 78, 188-190. doi:10.1016/j.biopsycho.2008.02.008
Percent memory recall by blood glucose level
What type of design is employed? ANOVA results for blood glucose levels ANOVA results for memory recall
Back to Based upon this study, what would your answer be to peers wondering about the impact of a good breakfast on their course performance?
