Stress hormones at the time of learning new memory formation; the presence of stress hormones at the time of recall retrieval of older memories.

Stress hormones at the time of learning often improve new memory formation; the presence of stress hormones at the time of recall often impair retrieval of older memories.

Around the time of learning, stress marked by the increased presence of cortisol can improve the formation of new memory. Research has proven this true.

However, when it is time to recall the information, stress will hinder the effective remembrance of pieces of information.

So, if the cortisol hormone is high at the point when some information is to be recollected, there would be difficulties in the retrieval of memories.

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Stress hormones at the time of learning __interferes___ new memory formation; the presence of stress hormones at the time of recall _impairs retrieval of older memories.

Explanation:

When stressed, the human body produces some stress hormone. Some of these hormones can affect certain parts of the brain, interfering with the encoding of new memory,  and inhibiting the recall of long term or older memories. An example of a stress hormone responsible for negatively affecting long-term, delayed recall memory is the cortisol, and the effect is usually felt at the hippocampus, prefrontal cortex and the amygdala.

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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