The key to her international success was a small singing part in the film Come Back Africa, a dramatised documentary on black life directed covertly by Lionel Rogosin.
A signal was presented at screen center for 2 s prior to the start of each block, to instruct the observer to direct attention covertly to one side for the whole of the block.
Subjects were instructed to covertly direct their attention to the target area located in the direction of the instruction arrow or, in the case of a circle, to focus their attention on the center.
After it was written in the early 70's, when productions of Mr. Havel's plays were banned, his friend and neighbor Mr. Krob proposed to produce and direct the play covertly.
During the localizer phase the subjects were instructed where to covertly direct their visuospatial attention.
Participants were asked to keep central fixation, to covertly direct and maintain attention to the cued position, and to respond to targets at cued and noncued locations.
Each block lasted 30 s and started with a spatial cue (fixation point turning into an arrowhead for 570 ms) indicating that attention should be covertly directed either to the right or left hemifield or maintained neutrally.
In a telepresence application, where a robot was navigated through a course containing four targets, the user communicated the intended movement by covertly directing the attention between four different regions in the visual field.
In Experiment 1, participants maintained gaze on a central point throughout, while covertly directing spatial attention toward either the left or the right hemifield on each trial, according to a randomly determined prior cue signal that preceded the presentation of the target.
Additionally, in some blocks this direction bias was covertly reversed in the middle of the block.
One activist told me she suspected that Climate Camp would now move away from its usual tactic of announcing targets in advance and begin working more covertly like many other direct action groups.
