Social status-dependent modulation of LG-flip habituation in the crayfish
Social status-dependent modulation of LG-flip habituation in the crayfish
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DOI：
10.1242/jeb.075689
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发表时间：
2013-02-01
影响因子：
2.8
通讯作者：
Nagayama, Toshiki
中科院分区：
文献类型：
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作者：
Araki, Makoto;Hasegawa, Takuya;Nagayama, Toshiki
强刺激施加到小龙虾的尾扇克氏原螯虾诱发横向巨大interneurone（LG）介导的tailflips。当感觉刺激被反复施加时，LG的反应习惯化，直到它不能产生尖峰。我们发现这种LG翻转习惯依赖于社会地位。在短的刺激间隔为5秒，适应率的LG在社会上占主导地位的和从属的小龙虾低于社会孤立的动物。相比之下，与一个长的刺激间隔60秒，从属动物的习惯化率低于社会孤立和占主导地位的动物。在习惯化之后的LGs的兴奋性也依赖于社会地位。在习惯化之后，LGS的尖峰响应在几分钟内恢复;然而，它们表现出显著的抑郁，兴奋性降低。与5或60 s的刺激间隔，从属动物表现出较长的延迟抑郁症相比，占主导地位的动物。下级小龙虾习惯化率的降低和抑郁症的延迟将有利于维持积极的逃避反应以逃避优势动物的重复攻击，并降低适应社会地位的学习能力。
Strong stimuli applied to the tailfan of the crayfish Procambarus clarkii evoked lateral giant interneurone (LG)-mediated tailflips. When the sensory stimulus was applied repeatedly, the response of the LG habituated until it failed to give rise to a spike. We found that this LG-flip habituation was dependent on social status. With a short interstimulus interval of 5 s, the rate of habituation of the LG in both socially dominant and subordinate crayfish was lower than that in socially isolated animals. By contrast, with a long interstimulus interval of 60 s, the rate of habituation of subordinate animals was lower than that of both socially isolated and dominant animals. The excitability of the LGs following habituation was also dependent on social status. Following habituation, the spike response of LGs recovered within several minutes; however, they showed significant depression with a decrease in excitability. With a 5 or 60 s interstimulus interval, subordinate animals showed longer delays of depression compared with dominant animals. A decrease in the rate of habituation and a delay of depression in subordinate crayfish would be advantageous for maintaining an active escape response to evade repeated attacks of dominant animals and a reduced learning ability to adapt to social status.