PSYC 230 UIUC EXAM 1 2025 ACTUAL EXAM
QUESTIONS WITH 100% CORRECT SOLUTIONS
| GUARANTEED SUCCESS.
EEG (electroencephalogram) - Correct Answer-shows brain's electrical
activity by positioning electrodes over the scalp
Fmri (functional MRI) - Correct Answer-A technique for revealing bloodflow
and, therefore, brain activity by comparing successive MRI scans. Fmri
scans show brain function
Psychophysical Scale - Correct Answer-a scale that measures the
relationship between human reactions and the physical stimuli causing
these reactions
Absolute threshold - Correct Answer-the minimum intensity of stimulation
that must occur before you experience a sensation
Method of limits - Correct Answer-measure a subject's perception of stimuli
by determining at what level a stimulus is detected by a subject
1|Page
,Method of constant stimuli - Correct Answer-Many stimuli, ranging from
rarely to almost always perceivable, are presented one at a time (50%
detection)
Method of adjustment - Correct Answer-the experimenter or the observer
adjusts the stimulus intensity in a continuous manner until the observer
detects the stimulus
Sensitivity - Correct Answer-the strength of the capacity to detect and
discriminate stimuli. It is how strong the perception of a stimulus is in an
individual
Magnitude Estimation - Correct Answer-participants judge and assign
numerical estimates to the perceived strength of a stimulus
Steven's Power Law - Correct Answer-relationship between the magnitude
of a physical stimulus and the intensity or strength that people feel
Catch Trials and their use - Correct Answer-catch trials are those in which
no signal is given. The use of a catch trial may help to estimate the level at
which a participant is guessing when no stimulus is present
2|Page
, Signal Dectection Theory - Correct Answer-a theory predicting how and
when we detect the presence of a faint stimulus (signal) amid background
stimulation (noise). Assume that there is no single absolute threshold and
that detection depends partly on a person's experience, expectations,
motivation, and alertness
Criterion - Correct Answer-controlled by the observer
D prime - Correct Answer-The distance between the signal and the external
noise + signal.
Large d' - increasing the discriminability of signal from noise (Loud
ringtone, soft music)MORE CORRECT RESPONSES
Small d' - decreasing the discriminability of signal from noise (soft ringtone,
loud music)
Hit - Correct Answer-Signal Present
Signal Detected
Miss - Correct Answer-Signal Present
Signal not detected
False Alarm - Correct Answer-Signal not present
Signal detected
3|Page
QUESTIONS WITH 100% CORRECT SOLUTIONS
| GUARANTEED SUCCESS.
EEG (electroencephalogram) - Correct Answer-shows brain's electrical
activity by positioning electrodes over the scalp
Fmri (functional MRI) - Correct Answer-A technique for revealing bloodflow
and, therefore, brain activity by comparing successive MRI scans. Fmri
scans show brain function
Psychophysical Scale - Correct Answer-a scale that measures the
relationship between human reactions and the physical stimuli causing
these reactions
Absolute threshold - Correct Answer-the minimum intensity of stimulation
that must occur before you experience a sensation
Method of limits - Correct Answer-measure a subject's perception of stimuli
by determining at what level a stimulus is detected by a subject
1|Page
,Method of constant stimuli - Correct Answer-Many stimuli, ranging from
rarely to almost always perceivable, are presented one at a time (50%
detection)
Method of adjustment - Correct Answer-the experimenter or the observer
adjusts the stimulus intensity in a continuous manner until the observer
detects the stimulus
Sensitivity - Correct Answer-the strength of the capacity to detect and
discriminate stimuli. It is how strong the perception of a stimulus is in an
individual
Magnitude Estimation - Correct Answer-participants judge and assign
numerical estimates to the perceived strength of a stimulus
Steven's Power Law - Correct Answer-relationship between the magnitude
of a physical stimulus and the intensity or strength that people feel
Catch Trials and their use - Correct Answer-catch trials are those in which
no signal is given. The use of a catch trial may help to estimate the level at
which a participant is guessing when no stimulus is present
2|Page
, Signal Dectection Theory - Correct Answer-a theory predicting how and
when we detect the presence of a faint stimulus (signal) amid background
stimulation (noise). Assume that there is no single absolute threshold and
that detection depends partly on a person's experience, expectations,
motivation, and alertness
Criterion - Correct Answer-controlled by the observer
D prime - Correct Answer-The distance between the signal and the external
noise + signal.
Large d' - increasing the discriminability of signal from noise (Loud
ringtone, soft music)MORE CORRECT RESPONSES
Small d' - decreasing the discriminability of signal from noise (soft ringtone,
loud music)
Hit - Correct Answer-Signal Present
Signal Detected
Miss - Correct Answer-Signal Present
Signal not detected
False Alarm - Correct Answer-Signal not present
Signal detected
3|Page
