We investigated the modulation of the somatosensory evoked potential (SEP) elicited by mechanical stimuli in a spatial sustained attention and a spatial trial-by-trial cueing design by means of high density electrode array EEG recordings.
ERP evidence for this has been provided in spatial trial-by-trial cueing studies including 'neutral' or 'control' trials (Schröger & Eimer, 1997; Bidet-Caulet et al., 2010).
Thus, when a spatial target trial had not been preceded by previous spatial trials, RT was slower when the pre-cue cued both the spatial and verbal dimensions compared to when the pre-cue was neutral.
All runs during the experiment consisted of equal amounts of encoding and retrieval trials, spatial and non-spatial trials, and trials with "sun"/ rain" outcomes.
Most critically, SVM feature weights cannot be used to visualize which voxels are more responsive for spatial vs. non-spatial trials.
Further, for each MVPA analysis (rule-based, visual) it would be informative to look into the SVM weight maps to see which voxels are more responsive for spatial vs. non-spatial trials, etc.
For example, the fixation cross remained displayed throughout each spatial cueing trial, but not during central cue trials (the purpose of this stimulus arrangement was to encourage a central focus of attention in both tasks, while minimising the likelihood of any shifts of spatial attention occurring during the central cue task).
On the fifth (24 h after spatial training trial 16) and tenth days of testing (24 h after spatial training trial 32), a probe trial was conducted to determine the extent to which the rats had learned about the spatial location of the platform.
On the seventh (24 h after spatial training trial number 24) and tenth days of testing (24 h after spatial training trial 36), a probe trial was conducted to determine the extent to which the mice had learned about the spatial location of the platform.
As a control, all of the mice were tested in a static spatial separation trial during which there was no change in the object location between the sample and test trials.
For example a spatial target trial containing an A at 6 o'clock, followed by a T at 3 o'clock would be defined as an AXspatial AYverbal trial.
