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Chronic thresholds for evoking perceptual responses in the rat sensory cortex

机译:在大鼠感觉皮层中唤起感知反应的慢性阈值

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Stimulation of neural tissue for the remediation of brain and sensory deficits requires that stimulation paradigms are selected carefully to deliver the most stable, efficient and safest stimulation to evoke the desired therapeutic response. Here we asked two questions of a penetrating cortical prosthesis use to evoke sensory-guided behavior: 1) does the threshold charge required to evoke a behavioral response change over time? 2) what effect does changing the frequency of stimulation have on stimulus threshold? To answer these questions we implanted a 4-electrode array into the somatosensory (tactile) cortex of a Sprague Dawley rat. The threshold charge to evoke a behavioral response was measured weekly over a 9-week period. Stimulation frequencies of 50 or 200 Hz were used, while all other stimulus parameters were kept constant. Within a maximum current limit of 100 μA and with a pulse width of 200 μs, we reliably elicited a behavioral response on 2 electrodes. Over the 9 week implantation period there was an initial increase in threshold current at 4 weeks, followed by a decrease at week 5 post-implantation; by week 8 post-implantation, thresholds appeared to have stabilized. Although we could reliably evoke a response at both 50 and 200 Hz, the stimulus frequency of 50 Hz required on average a lower threshold charge to evoke a response.
机译:针对脑和感觉缺陷的修复的刺激神经组织要求仔细选择刺激范例,以提供最稳定,有效和最安全的刺激,以引起所需的治疗反应。在这里,我们向唤起感官引导行为的渗透皮疹假体使用的两个问题:1)唤起行为应答所需的阈值充电是否随时间变化? 2)改变刺激频率对刺激阈值有何影响?为了回答这些问题,我们将一个4电极阵列植入到Sprague Dawley Rat的躯体感觉(触觉)皮质中。每周衡量行为响应的阈值充电在9周的时间内测量。使用刺激频率为50或200Hz,而所有其他刺激参数保持恒定。在100μA的最大电流限制内,脉冲宽度为200μs,我们可靠地引发了2个电极的行为响应。在9周的植入期间,4周内阈值电流初步增加,然后在植入后第5周下降;截至第8周,植入后,阈值似乎已稳定。虽然我们可以可靠地唤起50和200 Hz的响应,但平均较低阈值充电所需的50 Hz的刺激频率以引起反应。

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