Reduction of theta rhythm dissociates grid cell spatial periodicity from directional tuning.

Reduction of theta rhythm dissociates grid cell spatial periodicity from directional tuning.
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DOI:
10.1126/science.1201652
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发表时间:
2011-04-29
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Hasselmo ME
Hasselmo ME
中科院分区:
其他
文献类型:
--
作者:
Brandon MP;Bogaard AR;Libby CP;Connerney MA;Gupta K;Hasselmo ME

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在自由活动的大鼠内侧内嗅皮层中记录的网格细胞表现出在规则空间位置的放电和随着θ节律振荡(4-11 Hz)的时间调制。我们分析了用蝇蕈醇灭活内侧隔膜(MS)引起的网络θ节律振荡减少过程中的网格细胞空间编码。在 MS 失活期间,网格细胞失去了空间周期性,而头部方向细胞保持了其选择性。头部方向的联合网格细胞失去了网格细胞的空间周期性,但保留了头部方向的特异性。所有细胞的自相关和互相关节律性均降低。这支持了网格细胞的空间编码需要θ振荡的假设,并且分离了内嗅网格细胞周期性和头部方向选择性的生成机制。
Grid cells recorded in medial entorhinal cortex of freely moving rats exhibit firing at regular spatial locations and temporal modulation with theta rhythm oscillations (4–11 Hz). We analyzed grid cell spatial coding during reduction of network theta rhythm oscillations caused by medial septum (MS) inactivation with muscimol. During MS inactivation, grid cells lost their spatial periodicity, whereas head direction cells maintained their selectivity. Conjunctive grid-by-head-direction cells lost grid cell spatial periodicity but retained head direction specificity. All cells showed reduced rhythmicity in autocorrelations and cross-correlations. This supports the hypothesis that spatial coding by grid cells requires theta oscillations, and dissociates the mechanisms underlying generation of entorhinal grid cell periodicity and head direction selectivity.
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