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首页> 外文期刊>Journal of Neurophysiology >Mechanisms underlying intensity-dependent changes in cortical selectivity for frequency-modulated sweeps.
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Mechanisms underlying intensity-dependent changes in cortical selectivity for frequency-modulated sweeps.

机译：频率选择性扫描的皮质选择性强度依赖性变化的潜在机制。

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摘要

Frequency-modulated (FM) sweeps are common components of species-specific vocalizations. The intensity of FM sweeps can cover a wide range in the natural environment, but whether intensity affects neural selectivity for FM sweeps is unclear. Bats, such as the pallid bat, which use FM sweeps for echolocation, are suited to address this issue, because the intensity of echoes will vary with target distance. In this study, FM sweep rate selectivity of pallid bat auditory cortex neurons was measured using downward sweeps at different intensities. Neurons became more selective for FM sweep rates present in the bat's echolocation calls as intensity increased. Increased selectivity resulted from stronger inhibition of responses to slower sweep rates. The timing and bandwidth of inhibition generated by frequencies on the high side of the excitatory tuning curve [sideband high-frequency inhibition (HFI)] shape rate selectivity in cortical neurons in the pallid bat. To determine whether intensity-dependent changes in FM rate selectivity were due to altered inhibition, the timing and bandwidth of HFI were quantified at multiple intensities using the two-tone inhibition paradigm. HFI arrived faster relative to excitation as sound intensity increased. The bandwidth of HFI also increased with intensity. The changes in HFI predicted intensity-dependent changes in FM rate selectivity. These data suggest that neural selectivity for a sweep parameter is not static but shifts with intensity due to changes in properties of sideband inhibition.
机译：调频（FM）扫描是特定物种发声的常见组成部分。 FM扫描的强度可以覆盖自然环境中的广泛范围，但是强度是否会影响FM扫描的神经选择性尚不清楚。使用FM扫描进行回声定位的蝙蝠（如苍白蝙蝠）适合解决此问题，因为回声的强度会随目标距离而变化。在这项研究中，使用向下扫描在不同强度下测量苍白蝙蝠听觉皮层神经元的FM扫描速率选择性。随着强度的增加，神经元对蝙蝠回声定位调用中出现的FM扫描速率变得更具选择性。选择性增加归因于对较慢扫描速率的较强抑制作用。兴奋性调谐曲线高侧频率产生的抑制作用的时机和带宽[边带高频抑制（HFI）]在苍白蝙蝠的皮质神经元中形成速率选择性。为了确定FM速率选择性的强度依赖性变化是否是由于抑制作用的改变所致，使用双音抑制范式以多种强度对HFI的时间和带宽进行了定量。随着声音强度的增加，HFI相对于激励更快地到达。 HFI的带宽也随着强度的增加而增加。 HFI的变化预测了FM速率选择性的强度依赖性变化。这些数据表明，扫描参数的神经选择性不是静态的，而是由于边带抑制特性的变化而随强度变化。

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