期刊论文详细信息
Frontiers in Behavioral Neuroscience
Learning about time within the spinal cord: Evidence that spinal neurons can abstract and store an index of regularity
Misty Marie Strain1  Kyle M. Baumbauer1  Joel D Turtle2  Yung-Jen eHuang2  James W Grau2  Kuan H. Lee3 
[1] M University;;Texas A&University of Pittsburgh;
关键词: Memory;    Spinal Cord;    central pattern generator;    time;    instrumental learning;   
DOI  :  10.3389/fnbeh.2015.00274
来源: DOAJ
【 摘 要 】

Prior studies have shown that intermittent noxious stimulation has divergent effects on spinal cord plasticity depending upon whether it occurs in a regular [fixed time (FT)] or irregular [variable time (VT)] manner: In spinally transected animals, VT stimulation to the tail or hind leg impaired spinal learning whereas an extended exposure to FT stimulation had a restorative/protective effect. These observations imply that lower level systems are sensitive to temporal relations. Using spinally transected rats, it is shown that the restorative effect of FT stimulation emerges after 540 shocks; fewer shocks generate a learning impairment. The transformative effect of FT stimulation is related to the number of shocks administered, not the duration of exposure. Administration of 360 FT shocks induces a learning deficit that lasts 24 hours. If a second bout of FT stimulation is given a day after the first, it restores the capacity to learn. This savings effect implies that the initial training episode had a lasting (memory-like) effect. Two bouts of shock had a transformative effect when applied at different locations or at difference frequencies, implying spinal systems abstract and store an index of regularity (rather than a specific interval). Implications of the results for step training and rehabilitation after injury are discussed.

【 授权许可】

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