Amplitude, frequency, and phase analysis of hippocampal theta during sensorimotor processing in a jump avoidance task
Amplitude, frequency, and phase analysis of hippocampal theta during sensorimotor processing in a jump avoidance task
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DOI：
10.1002/hipo.20210
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发表时间：
2006-01-01
期刊：
影响因子：
3.5
通讯作者：
Abriam, Jason
中科院分区：
文献类型：
--
作者：
Bland, Brian H.;Jackson, Jesse;Abriam, Jason
在目前的研究中，植入海马记录电极的大鼠被训练在避免跳跃任务中避免电击，使用三个不同的高度，28、33和38厘米。目的是测量2型（不动相关）海马θ波振幅和频率的进展，记录在每个水平的跳避过程中，并确定在每个跳高的1型（运动相关）θ波跳波的相位和运动开始时刻之间是否存在一致的关系。结果表明，跳远前的静止期可分为感觉加工期和运动准备期。比较这两个时期，平均振幅较高，而频率在感觉加工期间保持相对恒定。在运动准备期，振幅与频率呈负相关，振幅迅速下降，频率迅速上升。在跳变过程中，θ振幅（类型1）与频率呈正相关，均达到峰值。对个体跳跃高度的单独分析进一步支持了theta参数与所需运动幅度之间的精确关系。最高的跳跃高度表现出明显的相位偏好，运动开始发生在从齿状区域的地层分子记录的θ波谷周围。这些发现支持了海马θ波振荡和同步的产生与感觉运动加工和整合有关的结论。(c) 2006 Wiley-Liss, Inc。
the current study, rats implanted with hippocampal recording electrodes were trained to avoid shock in a jump avoidance task, using three separate heights, 28, 33, and 38 cm. The objectives were to measure the progression of Type 2 (immobility-related) hippocampal theta amplitude and frequency recorded during jump avoidances at each of the levels, and determine if there was a consistent relationship between the phase of the Type 1 (movement related) theta jump wave and the moment of movement initiation at each of the jump heights. The results demonstrated that the immobility period prior to the execution of the jump could be divided into two components: a sensory processing period and a movement preparation period. Comparing these two periods, average amplitudes were higher while frequency remained relatively constant during the sensory processing period. During the movement preparation period there was a negative correlation between amplitude and frequency: amplitude declined rapidly and frequency increased rapidly. During the execution of the jump, theta amplitude (Type 1) and frequency were positively correlated, both reaching peak values. The separate analyses of the individual jump heights provided further support for the precise relationships between theta parameters and the magnitude of the required movements. A significant phase preference was demonstrated for the highest jump height, with movement initiation occurring around the trough of theta recorded from the stratum moleculare of the dentate region. The findings supported the conclusion that the generation of hippocampal theta band oscillation and synchrony was related to sensorimotor processing and integration. (c) 2006 Wiley-Liss, Inc.