在注意稳定的条件下，感受性发生周期性增强和减弱的现象叫（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30470' and id < 2461580 and id<>'2461580' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30470' and id > 2461580 and id<>'2461580' order by id asc limit 5