NEU 311L Exam 1 UPDATED Exam
Questions and CORRECT Answers
If we altered our in-class experiment such that 10 participants were exposed to the almond oil
condition for several minutes, and later that day the same 10 participants were exposed to the
lavender oil condition, which test should be used to see if there is a significant difference
between the means of the control and experimental conditions? Why? - CORRECT
ANSWER - Paired samples (repeated measures) t test. This is because a t test is used to
compare two means. It is paired samples because the 10 people in the study were each tested two
times, and so you have a pair of data points for each participant.
Feedback:
All of the participants were exposed to the both conditions, which makes is a repeated measures
design. It is a t test because there were two conditions. An ANOVA would be used for more than
two conditions.
As described in the video, a Likert scale will be used during the class experiment to have
participants self-report how relaxed they feel. If a participant filled out the Likert scale in the
way shown in this image, which score best approximates the score that should be given for this
response? Why? - CORRECT ANSWER - 27. The Likert scale we are using ranges from 0
(not relaxed) to 100 (extremely relaxed). Each small tick mark is 1 mm. Each cm (indicated as a
whole number on the ruler) is 10 mm. The blue line is placed somewhere between the 2 cm and
the 3 cm marker, so the rating is somewhere between 20-30. The blue mark appears close to the
7th tick mark past the 2, so a score of 27 is reasonable for this data point.
Feedback: This is a 10 cm (100 mm) - long ruler. The score is determined by the mm that the
mark is closest to. Since the mark is closest to the 2.7 cm (27 mm) mark, the score should be 27.
Which of the following statements is TRUE about electroencephalography (EEG)? - CORRECT
ANSWER - It picks up signals from superficial layers of the brain, such as the cortex.
Feedback : Standard EEG signals originate in the cortex. The electrode cannot detect signals
from deeper structures nor from individual cells since it is too far away from them! On the plus
side, being able to pick up cortical signals in a non-invasive manner makes EEG a great interface
, for controlling computers. However, the signal does diminish as is passes through all of the
material between the brain and skin.
What does the subject who is being recorded from likely doing at about the 4:00 min time point
(the moment near the transition from the end of the dark blue-shaded period to the light blue-
shaded period)? How do you know? - CORRECT ANSWER - They opened their eyes.
The yellow & pink band that appears around 2 minutes into the recording is about 10 Hz and
thus is in the frequency range of alpha waves. The 10 Hz band seems to fire at a rather consistent
amplitude for the next two minutes, at which time is abruptly disappears. Since it is typical for
alpha waves to be strongest when one closes their eyes, it is reasonable to predict that the subject
closed their eyes at around the 2:00 minute mark and then opened them again around the 4:00
minute mark.
Feedback: This graph shows alpha waves with a frequency around 10 Hz during the time shaded
in dark blue. As you know, alpha waves tend to be most prominent when the eyes are shut. These
waves diminish at about 4:00 min, and thus a logical explanation for this change is that they
opened their eyes.
Which statement is FALSE? - CORRECT ANSWER - Time is plotted on the X axis of the
PSD plot.
Feedback: Frequency is plotted on the X axis in a PSD plot, not time. The PSD plot does not
provide time information.
Which of the following should NOT be included in a figure legend for NEU311L? - CORRECT
ANSWER - Whether or not the results support the hypothesis
If a student submits a Great Aunt Sarah assignment that is assessed by the assistant instructor in
the following way, which grade will they receive?
Totally complete
Mostly accurate
Somewhat clear & engaging - CORRECT ANSWER - 80% (8/10 points)
Questions and CORRECT Answers
If we altered our in-class experiment such that 10 participants were exposed to the almond oil
condition for several minutes, and later that day the same 10 participants were exposed to the
lavender oil condition, which test should be used to see if there is a significant difference
between the means of the control and experimental conditions? Why? - CORRECT
ANSWER - Paired samples (repeated measures) t test. This is because a t test is used to
compare two means. It is paired samples because the 10 people in the study were each tested two
times, and so you have a pair of data points for each participant.
Feedback:
All of the participants were exposed to the both conditions, which makes is a repeated measures
design. It is a t test because there were two conditions. An ANOVA would be used for more than
two conditions.
As described in the video, a Likert scale will be used during the class experiment to have
participants self-report how relaxed they feel. If a participant filled out the Likert scale in the
way shown in this image, which score best approximates the score that should be given for this
response? Why? - CORRECT ANSWER - 27. The Likert scale we are using ranges from 0
(not relaxed) to 100 (extremely relaxed). Each small tick mark is 1 mm. Each cm (indicated as a
whole number on the ruler) is 10 mm. The blue line is placed somewhere between the 2 cm and
the 3 cm marker, so the rating is somewhere between 20-30. The blue mark appears close to the
7th tick mark past the 2, so a score of 27 is reasonable for this data point.
Feedback: This is a 10 cm (100 mm) - long ruler. The score is determined by the mm that the
mark is closest to. Since the mark is closest to the 2.7 cm (27 mm) mark, the score should be 27.
Which of the following statements is TRUE about electroencephalography (EEG)? - CORRECT
ANSWER - It picks up signals from superficial layers of the brain, such as the cortex.
Feedback : Standard EEG signals originate in the cortex. The electrode cannot detect signals
from deeper structures nor from individual cells since it is too far away from them! On the plus
side, being able to pick up cortical signals in a non-invasive manner makes EEG a great interface
, for controlling computers. However, the signal does diminish as is passes through all of the
material between the brain and skin.
What does the subject who is being recorded from likely doing at about the 4:00 min time point
(the moment near the transition from the end of the dark blue-shaded period to the light blue-
shaded period)? How do you know? - CORRECT ANSWER - They opened their eyes.
The yellow & pink band that appears around 2 minutes into the recording is about 10 Hz and
thus is in the frequency range of alpha waves. The 10 Hz band seems to fire at a rather consistent
amplitude for the next two minutes, at which time is abruptly disappears. Since it is typical for
alpha waves to be strongest when one closes their eyes, it is reasonable to predict that the subject
closed their eyes at around the 2:00 minute mark and then opened them again around the 4:00
minute mark.
Feedback: This graph shows alpha waves with a frequency around 10 Hz during the time shaded
in dark blue. As you know, alpha waves tend to be most prominent when the eyes are shut. These
waves diminish at about 4:00 min, and thus a logical explanation for this change is that they
opened their eyes.
Which statement is FALSE? - CORRECT ANSWER - Time is plotted on the X axis of the
PSD plot.
Feedback: Frequency is plotted on the X axis in a PSD plot, not time. The PSD plot does not
provide time information.
Which of the following should NOT be included in a figure legend for NEU311L? - CORRECT
ANSWER - Whether or not the results support the hypothesis
If a student submits a Great Aunt Sarah assignment that is assessed by the assistant instructor in
the following way, which grade will they receive?
Totally complete
Mostly accurate
Somewhat clear & engaging - CORRECT ANSWER - 80% (8/10 points)
