使用SeU-net进行信号扩展,以提高基于SSVEP的短时间脑电脑接口的解码性能
概括
在没有对象校准的情况下,SeU-net可以扩展短静态视觉唤起潜力 (SSVEP) 信号. 这种新的方法提高了脑计算机接口 (BCI) 的性能,为患者提供更快,更准确的解码.
科学领域:
- 神经科学是一个神经科学.
- 生物医学工程 生物医学工程
- 机器学习 机器学习
背景情况:
- 基于稳定状态视觉唤起潜力 (SSVEP) 的脑计算机接口 (BCI) 为患者提供了显著的好处.
- 目前的SSVEP识别方法在短信号长度方面扎,限制了BCI的性能.
- 信号长度是SSVEP识别精度的一个关键因素.
研究的目的:
- 引入SeU-net,一种新的信号扩展方法,用于改进短信号的SSVEP无校准识别.
- 通过解决信号持续时间有限的挑战来提高SSVEP-BCI的性能.
- 开发一种不需要特定对象的校准数据的方法.
主要方法:
- 拟议的SeU-net采用长短期记忆 (LSTM) 和对比学习来提取特征.
- 该方法将信号转换为特征空间,并将其转换为样本空间以扩展信号.
- SeU-net专注于时间域信号延伸,确保跨学科的适用性.
主要成果:
- SeU-net显著提高了短SSVEP信号的无校准方法的解码性能.
- 该方法展示了强大的跨主题信号延伸能力.
- 实验证实,通过更短的SSVEP信号持续时间,提高了准确性.
结论:
- SeU-net有效地扩展短SSVEP信号,提高了无校准BCI性能.
- 该方法有可能推进高速SSVEP-BCI应用程序.
- 通过更短的信号提高解码精度,扩大了BCI的可访问性和可用性.
相关概念视频
01:41Signal Sequences and Sorting Receptors
Signal sequences are short amino acid sequences that guide newly synthesized proteins to their proper location within the cell. Classical signal sequences are fifteen to sixty amino acids long and present at the N-terminus of a polypeptide chain. Each signal sequence has a conserved segment of basic residues towards their N terminus, a hydrophobic core, and a C-terminus rich in polar residues. The C-terminus also contains a signal cleavage site and features a -3 -1 sequence motif. The -3-1...
01:22Amplifying Signals via Enzymatic Cascade
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
01:26Signal and System
A signal x(t) is a set of data or a time function representing a variable of interest. Signals typically convey information about a phenomenon, such as atmospheric temperature, humidity, human voice, television images, a dog's bark, or birdsongs. More generally, a signal can be a function of more than one independent variable. For instance, images depend on horizontal and vertical positions and can be regarded as two-dimensional signals. However, this text will focus on one-dimensional signals...
01:17Energy and Power Signals
In an electrical system with a resistor, voltage and current signals facilitate the measurement of power and energy across the resistor. For a continuous-time signal, the total energy over a time interval is defined as the integral of the square of the signal's magnitude over that interval. Mathematically, this is expressed as:
01:10Reconstruction of Signal using Interpolation
Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next sampling...
01:29Downstream Processing
Downstream processing begins once fermentation is complete and involves a series of steps to recover and purify products such as acids, vitamins, antibiotics, or proteins.Cell HarvestingFor example, for intracellular protein-based products, the first step is harvesting the cells. This is typically achieved using centrifugation or filtration to separate the cells from the liquid phase.Cell Disruption for Intracellular ProductsIf the target product is intracellular, the harvested cells must be...