Psychology

How many different MRI pulse sequences do they use Give the types and names of pulse sequences.

In the study, there were actually 65 different MRI pulse sequences used in direct coherence with 303 sentences.  These sentences were subject to three classifications motion, static, and fictive.  In the motion group, a motion verb is being described with movement.  For example, participants were prompted with sentences such as The deer jumped over the brook.  Static sentences are describing events with little or no movement at all.  A sample sentence of this category would be The bridge stretched over the brook.  And finally, fictive motion sentences contain a motion verb used non-literally so that it will appear similarly to the static sentences.

What is the spatial resolution of the fMRI scans From this information, what FOV are they using if we assume that the point resolution is 64x64

For this experiment, the researchers used a 3-T GE Signa EXCITE scanner equipped with a phased-array head coil.  For every participant, the fMRI data has a spatial resolution of 1 x 1 x 1.3 mm anatomical scan. These were actually collected in the middle of the scanning session.  From this information, if the researchers used a 64 x 64 spatial resolution, then it would have been possible that B0 filed maps were no longer collected to correct the image distortions in the functional images.

What is the spatial resolution of the structural scans Using the same FOV as the fMRI images, what would be the point resolution How long would these structural scans take to acquire

The spatial resolution of the structural scans was recorded to be 2 x 3 repeated measures ANOVA.  The main experiment which is consisted of three runs of 273 volumes each takes about 9.1 minutes all throughout.  All of the subjects except one have completed 131 volumes for the MT  localizer and it took about 4.4 minutes.  There was a repetition time of 2000 msec and echo time of 30 msec.  For this experiment, there were nine sentences and nine blocks for each run.  The researchers used a block design of 30-sec blocks of sentences and 15-sec blocks of baseline.

Draw a time line of the experiment. How many images are taken on each block
15 sec     15 sec       15 sec       15 sec         15 sec      15 sec          15 sec       15 sec

1    2         3  4         5               6                7                8                9

30 sec         30 sec        30 sec         30 sec       30 sec       30 sec        30 sec        30 sec