According to the focus on neuroscience box titled "psychological research using brain imaging" which of the following is not among the limitations of brain-imaging techniques?

- It is difficult to produce a highly detailed image of the brain.

Explanation:

Brain-imaging techniques are associated with the use of strategies that assist in either directly or obliquely imaging the structure, operation, or working of the human brain and the nervous system. It assists the researchers to evaluate the problems associated with the brain of a human.

As per the given description, the limitation of brain-imaging would not include that 'it is difficult to produce a highly detailed image of the brain' as brain-imaging allows us to produce even the 'activation maps reflecting flow of blood to several parts of the brain' through fMRI and various other techniques allows to image the functionality in order to know the problems within the brain. Therefore, this goes against the limitations.

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals