The phrase "presentation block" is correct and usable in written English.
It generally refers to a set of slides being presented, or the actual act of presenting. For example, "I'm really nervous about my presentation block tomorrow in class."
In the second, third and fourth stimulus presentation blocks, orientation still varied randomly (blockwise randomization), but the contrast within each block was fixed: in the second block to low contrast only, in the third block to medium contrast only, and in the fourth block to high contrast only (Fig. 1A, "low", "medium" and "high contrast").
All dependent variables were subjected to the same repeated-measures ANOVA model with the within-subject factors presentation (blocked, mixed), feedback type (explicit, assigned), and valence (negative, positive).
This notion is consistent with a recent study [ 46] that directly contrasted the amplitude of the N170 to faces within presentation blocks that contained only face stimuli versus presentation blocks that alternated between faces and visual symbols, while controlling for interstimulus intervals between faces.
In this manuscript we review some aspects of fMRI study design, including cognitive comparison strategies (factorial, parametric designs), and stimulus presentation possibilities (block, event-related, rapid event-related, mixed, and self-driven experiment designs) along with technical aspects, such as limitations of signal to noise ratio, spatial, and temporal resolution.
The question to what extent emotion-related brain activation depends upon the presentation design (block design vs. event-related design) and the stimulus type (scene pictures vs. pictures with facial mimic) has hardly been addressed in previous functional magnetic resonance imaging (fMRI) research.
It should be noted that this study did not test or allow for all potential confounders; for example, daily patient loads, timing of presentations, access block or staffing levels at times of presentation may have contributed to the increased waiting times for patients.
The different experimental stimuli of each type were presented in blocks, with 64 presentations per block.
HIV-1 also influences epitope presentation by blocking TAP transport [73] and downregulating MHC molecules [74].
These differences to our earlier report can be attributed to the experimental design: The former data were based upon a paradigm with continuous stimulus presentation during blocks of 30 seconds, and the observed NBR and slowing of the EEG likely reflected habituation and longlasting sleep protective mechanisms.
For further advice for poster presentations, see Block (1996) and "Creating Effective Slides Without Having to Become a Graphic Designer".
