Mock Exam Flashcards
Which statement is correct?
- EEG signals can be used to reconstruct the underlying sources, which correspond to fMRI sources.
- EEG has the same temporal resolution as fMRI.
- The temporal resolution of EEG depends on the resolution of the blood flow response.
- EEG and fMRI reflect the activity of partly different sources.
EEG and fMRI reflect the activity of partly different sources.
Which of the following statements about brain-computer interfaces is not true?
- BCIs can read specific thoughts
- BCIs can recognize specific, well-defined control signals
- BCIs do not work equally well with all users
- speed, accuracy and robustness of BCIs are currently rather limited
BCIs can read specific thoughts
Another class of BCIs use motor imagery as control strategy which allows voluntary modulation of the sensorimotor rhythm (SMR). When imagining moving a hand or foot, this modulation consists of
- an increase in frequency of the SMR
- a decrease in frequency of the SMR
- an increase in power of the SMR
- a decrease in power of the SMR
a decrease in power of the SMR
Another class of BCIs use motor imagery as control strategy which allows voluntary modulation of the sensorimotor rhythm (SMR). When imagining moving the right hand, this modulation consists of …
- an increase in power of the SMR over the right hemisphere.
- an increase in frequency of the SMR over the left hemisphere.
- a decrease in power of the SMR over the left hemisphere.
- a decrease in frequency of the SMR over the right hemisphere.
a decrease in power of the SMR over the left hemisphere.
Which statement regarding the temporal properties of the hemodynamic response function is correct?
- even with careful experimental design a temporal resolution below approximately 1.6 seconds cannot be achieved
- if you decrease the repetition time TR, the duration of the HRF increases
- if you decrease the repetition time, the duration of the HRF decreases
- with careful experimental design the temporal resolution can be pushed to approximately 100 milliseconds
Which statement regarding the linearity of the BOLD response is true?
- The linear relationship between BOLD response and neural activity is especially high when stimuli are presented right after each other (<6s delay).
- More neural activity usually leads to a weaker BOLD response.
- The response for two stimuli presented close in time is approximately equal to the sum of both hemodynamic responses.
- The BOLD response allows for a direct measurement of neural activity.
The response for two stimuli presented close in time is approximately equal to the sum of both hemodynamic responses.
Which of the following statements about classic lesion analysis is not true?
- In the lesion-defined approach, behavioral performance of a group of patients with a common area of injury (e.g. DLPFC) is compared to that of a control group.
- The lesion-defined approach is good for assessing the functional roles of particular regions of interest.
- In the bahvior-defined approach, patients are grouped according to whether or not they show a specific behavioral deficit.
- The behavior-defined approach is specifically useful when behavioral data are continuous.
The behavior-defined approach is specifically useful when behavioral data are continuous.
Which of the following statements about manual segmentation approaches is not true?
- They have a good inter-protocol consistency.
- They remain the gold standard for volumetric analyses.
- They are ideal for delineation of structure with intricate anatomy/multiple subregions.
- They are well-suited for smaller studies with focused hypothesis.
They have a good inter-protocol consistency.
Which of the following statements is not true?
- The typical cortical thickness is 5-10 mm.
- Automated cortical thickness analysis frequently requires manual corrections.
- Cortical thickness is measured as the shortest distance between white and pial (grey matter)) surfaces.
- Automated cortical thickness analysis provides a direct, biologically meaningful measure.
The typical cortical thickness is 5-10 mm.
What is the function of the radio frequency receive coil?
- detection of the precessing magnetization
- broadcasting the radio frequency field to the patient
- alignment of nuclear spins to create longitudinal magnetization
- spatial encoding
detection of the precessing magnetization
The typical SPM preprocessing pipeline as presented in the lecture comprises …
- four preprocessing steps
- six preprocessing steps
- five preprocessing steps
- three preprocessing steps
six preprocessing steps
Motion-correction/realignment comprises two major steps.
- above-subject image registration and resampling
- below-subject image registration and resampling
- within-subject image registration and resampling
- between-subject image registration and resampling
within-subject image registration and resampling
Mass-univariate analysis means …
- that a general linear model with just one regressor is used
- that a searchlight-based analysis is performed
- that the signals from all voxels are analyzed together
- that the signals from all voxels are analyzed separately
that the signals from all voxels are analyzed separately
The objective of ordinary least squares is …
- to maximize the canonical correlation of data and design
- to minimize the sum of squared errors
- to minimize the variance of the implicit baseline regressor
- to maximize estimated model parameters
to minimize the sum of squared errors
Parametric regressors allow to …
- replace HRF-convolved regressors with data about event strength
- demonstrate modulation of the fMRI signal by event strength
- estimate non-linear effects of event strength on the fMRI signal
- demonstrate correlation of the fMRI signal with event strength
demonstrate modulation of the fMRI signal by event strength
