During scanning with the different flickering stimuli, the TASK assigned to the subjects was to detect a slight change in the orientation of the fixation cross.

Question

BlackTom AI · Accepted Answer

The task assigned to subjects was to detect a slight change in the orientation of the fixation cross.

Relevant knowledge points and concepts:
- In visual neuroimaging experiments with flickering stimuli, researchers commonly include a central fixation cross to ensure subjects maintain gaze and attention.
- An active, low-demand attention task (e.g., detecting a subtle orientation change of the fixation cross) is frequently used to prevent eye movements and to keep attentional state constant across trials.
- True/False questions evaluate whether the statement matches the described experimental procedure.

Step-by-step reasoning:
1. The statement explicitly describes the behavioral task given during scanning: subjects monitored a fixation cross and detected slight orientation changes.
2. This type of task is a standard experimental control: by asking subjects to report small orientation shifts at fixation, the experimenters ensure subjects are attending centrally and not shifting gaze toward peripheral flickering stimuli.
3. Because the statement precisely matches this common methodological approach, the statement is consistent with established practice and with the provided assertion in the question.

Why the correct answer is correct:
- The statement directly specifies the experiment’s task (detecting slight orientation changes of the fixation cross). That is a valid and typical task used during scanning with flickering stimuli to control gaze and attention; therefore the statement is true.

Why the other option (False) is incorrect:
- Marking the statement False would imply that subjects were not asked to detect orientation changes; that contradicts the described procedure. Alternative tasks (e.g., passive viewing, counting flashes, or detecting luminance changes) are possible in other studies, but they do not match the specific statement given here.

Conclusion:
The correct response is True, which matches the provided answer.

During scanning with the different flickering stimuli, the TASK assigned to the subjects was to detect a slight change in the orientation of the fixation cross.判断题

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