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从零开始的脑电分析:MNE-Python 指南

  • 2026-01-29 02:10:00
从零开始的脑电分析:MNE-Python 指南

一篇搞定脑电数据预处理、ERP、时频分析与统计检验的全流程教程

📌 写在前面

脑电(EEG)技术因其高时间分辨率,成为认知神经科学研究的首选工具。但面对高密度电极、长时段记录的海量数据,如何进行单变量大规模分析(Mass Univariate Analysis)成为研究者的核心挑战。

所谓"单变量",指的是对每个电极-时间点(或电极-频率)独立进行统计检验;而"大规模"则意味着我们同时进行成千上万次检验——比如64个电极 × 500个时间点 = 32,000次检验!这带来的挑战是多重比较问题:如果设定 p < 0.05,单纯进行32,000次检验会期望产生1600个假阳性!因此,我们需要特殊的统计校正方法。

本教程将完整介绍基于 MNE-Python 的分析流程:

数据导入 → 预处理 → ERP分析 → 时频分析 → 统计检验 → 可视化

第一部分:环境准备

安装 MNE-Python

# 完整安装(推荐)
pip install mne[full]

#
 或使用 conda
conda install -c conda-forge mne

核心依赖

import numpy as np
import matplotlib.pyplot as plt
import mne
from mne import Epochs
from mne.preprocessing import ICA
from mne.stats import permutation_cluster_test
from mne.time_frequency import tfr_morlet

第二部分:数据导入

MNE 支持几乎所有主流脑电数据格式:

格式
厂商
读取函数
.vhdr
BrainProducts
read_raw_brainvision()
.set
EEGLAB
read_raw_eeglab()
.cnt
Neuroscan
read_raw_cnt()
.edf
通用
read_raw_edf()

快速读取

import mne

# 读取 BrainVision 格式(最常用)
raw = mne.io.read_raw_brainvision(
'subject_01.vhdr',
    preload=True# 预加载到内存
)

# 设置电极位置(10-20系统)
montage = mne.channels.make_standard_montage('standard_1020')
raw.set_montage(montage)

第三部分:预处理流程

预处理是脑电分析的基础,直接影响后续结果的质量。以下是标准流程:

┌─────────────┐    ┌─────────────┐    ┌─────────────┐
│   重参考    │ → │   滤波      │ → │   ICA去伪迹 │
└─────────────┘    └─────────────┘    └─────────────┘
       ↓                                      ↓
┌─────────────┐    ┌─────────────┐    ┌─────────────┐
│   分段      │ → │  基线校正   │ → │  拒绝坏段   │
└─────────────┘    └─────────────┘    └─────────────┘

3.1 重参考与滤波

# 平均参考(最常用)
raw.set_eeg_reference('average')

# 带通滤波 0.5-40 Hz
raw.filter(l_freq=0.5, h_freq=40.)

# 陷波滤波去除50Hz工频干扰
raw.notch_filter(freqs=50)

3.2 ICA 去除眼电伪迹

# 创建ICA对象
ica = ICA(n_components=20, method='picard', random_state=42)
ica.fit(raw)

# 自动检测眼电成分
eog_epochs = mne.preprocessing.create_eog_epochs(raw)
eog_indices, _ = ica.find_bads_eog(eog_epochs)
ica.exclude = eog_indices

# 应用ICA
raw_clean = ica.apply(raw.copy())

3.3 数据分段

# 定义事件
events = mne.find_events(raw)
event_id = {'experimental'1'control'2}

# 创建 Epochs
epochs = Epochs(
    raw_clean,
    events,
    event_id,
    tmin=-0.2,     # 刺激前200ms
    tmax=0.8,      # 刺激后800ms
    baseline=(-0.20),  # 基线校正
    preload=True
)

第四部分:ERP分析

4.1 计算平均ERP

# 按条件平均
exp_evoked = epochs['experimental'].average()
ctrl_evoked = epochs['control'].average()

# 提取特定成分(如P3:250-500ms)
p3_window = (0.250.5)
p3_channels = ['Pz''P3''P4']

# 计算均值振幅
p3_data = exp_evoked.copy().crop(*p3_window).data
p3_amp = p3_data.mean()

4.2 ERP可视化

# 波形对比
mne.viz.plot_compare_evokeds(
    {'Experimental': exp_evoked, 'Control': ctrl_evoked},
    picks=['Fz''Cz''Pz'],
    colors={'Experimental''
#e74c3c''Control''#3498db'}
)

# 拓扑图(特定时间点)
times = [0.10.20.30.4]
exp_evoked.plot_topomap(times=times)

ERP波形对比

ERP拓扑脑图序列

第五部分:时频分析

时频分析揭示EEG信号的频域特征随时间的变化。

5.1 计算时频功率

# Morlet小波变换
freqs = np.arange(4352)  # 4-35 Hz
n_cycles = freqs / 2

power = tfr_morlet(
    epochs,
    freqs=freqs,
    n_cycles=n_cycles,
    average=True,
    return_itc=False
)

# 基线校正
power.apply_baseline(baseline=(-0.20), mode='mean')

5.2 频带分析

# 定义经典频带
bands = {
'delta': (14),
'theta': (48),
'alpha': (813),
'beta': (1330),
'gamma': (3050)
}

第六部分:统计检验

这是大规模分析的核心——如何正确处理多重比较问题。

6.1 聚类排列检验 (Cluster-based Permutation Test)

这是EEG研究中使用最广泛的统计方法,由 Maris & Oostenveld (2007) 提出。

核心思想

  1. 对每个电极-时间点计算 t 值
  2. 将相邻且超过阈值的点聚合成"聚类"
  3. 计算每个聚类的统计量(如 t 值之和)
  4. 通过排列检验获取 p 值
from mne.stats import permutation_cluster_test

# 准备数据
data_cond1 = epochs['experimental'].get_data()
data_cond2 = epochs['control'].get_data()

# 聚类排列检验
T_obs, clusters, p_values, H0 = permutation_cluster_test(
    [data_cond1, data_cond2],
    n_permutations=1000,  # 排列次数
    threshold=3.0,        # t阈值(约p<0.05)
    tail=0,               # 双尾检验
    n_jobs=-1# 并行计算
)

# 找显著聚类
significant_clusters = np.where(p_values < 0.05)[0]
print(f"发现 {len(significant_clusters)} 个显著聚类")

6.2 结果可视化

import matplotlib.pyplot as plt

# 绘制显著时间窗口
fig, ax = plt.subplots(figsize=(124))
times = epochs.times

for cl_idx in significant_clusters:
    cluster = clusters[cl_idx]
    time_ind = cluster[1]
    ax.axvspan(
        times[time_ind[0]], times[time_ind[-1]],
        alpha=0.3, color='red',
        label=f'p={p_values[cl_idx]:.3f}'
    )

# 绘制t值曲线
ax.plot(times, T_obs[epochs.ch_names.index('Pz'), :])
ax.axhline(3.0, color='k', linestyle='--', label='阈值')
ax.set_xlabel('时间 (s)')
ax.set_ylabel('t 值')
ax.legend()

第七部分:完整代码示例

以下是一个可直接运行的完整脚本:

"""
脑电分析完整流程
=====================
作者: 脑电分析札记
日期: 2026
"""


import numpy as np
import matplotlib.pyplot as plt
import mne
from mne import Epochs, create_info
from mne.preprocessing import ICA
from mne.stats import permutation_cluster_test
from mne.time_frequency import tfr_morlet

# ──────────────────────────────────────
# 1. 数据加载
# ──────────────────────────────────────
raw = mne.io.read_raw_brainvision('data.vhdr', preload=True)

# 设置电极位置
montage = mne.channels.make_standard_montage('standard_1020')
raw.set_montage(montage)

# ──────────────────────────────────────
# 2. 预处理
# ──────────────────────────────────────
# 重参考
raw.set_eeg_reference('average')

# 滤波
raw.filter(0.540., fir_design='firwin')
raw.notch_filter([50100])

# ICA去眼电
ica = ICA(n_components=20, method='picard', random_state=42)
ica.fit(raw)
eog_indices, _ = ica.find_bads_eog(raw)
ica.exclude = eog_indices
raw = ica.apply(raw)

# ──────────────────────────────────────
# 3. 分段
# ──────────────────────────────────────
events = mne.find_events(raw)
event_id = {'exp'1'ctrl'2}

epochs = Epochs(
    raw, events, event_id,
    tmin=-0.2, tmax=0.8,
    baseline=(-0.20),
    preload=True,
    reject={'eeg'150e-6}
)

# ──────────────────────────────────────
# 4. ERP分析
# ──────────────────────────────────────
exp_evoked = epochs['exp'].average()
ctrl_evoked = epochs['ctrl'].average()

# 可视化
mne.viz.plot_compare_evokeds(
    {'实验': exp_evoked, '对照': ctrl_evoked},
    picks=['Fz''Cz''Pz'],
    colors={'实验''#e74c3c''对照''#3498db'}
)

# ──────────────────────────────────────
# 5. 时频分析
# ──────────────────────────────────────
power = tfr_morlet(
    epochs['exp'],
    freqs=np.arange(4352),
    n_cycles=7,
    average=True
)
power.apply_baseline((-0.20), mode='mean')

# 绘制时频图
power.plot(picks='Pz', baseline=(-0.20))

# ──────────────────────────────────────
# 6. 统计检验
# ──────────────────────────────────────
data_exp = epochs['exp'].get_data()
data_ctrl = epochs['ctrl'].get_data()

T_obs, clusters, p_values, H0 = permutation_cluster_test(
    [data_exp, data_ctrl],
    n_permutations=1000,
    threshold=3.0,
    tail=0,
    n_jobs=-1
)

# 输出结果
for i, p in enumerate(p_values):
if p < 0.05:
        print(f"聚类 {i+1}: p = {p:.4f} **")

print("分析完成!")

进阶技巧

技巧1:批量处理多被试

import glob
from pathlib import Path

results = {}

for file in glob.glob('data/sub-*/eeg/*.vhdr'):
    sub_id = Path(file).parent.parent.name

# 加载和预处理
    raw = mne.io.read_raw_brainvision(file, preload=True)
# ... (预处理步骤)

# 分析并保存结果
    results[sub_id] = {
'p3_amplitude': p3_amp,
'n170_latency': n170_lat
    }

技巧2:自动检测坏通道

# 使用信噪比检测
noise_levels = raw.copy().filter(110140).get_data()
noise_levels = np.abs(noise_levels).mean(axis=1)

bad_channels = np.where(noise_levels > 2 * np.median(noise_levels))[0]
raw.info['bads'] = [raw.ch_names[i] for i in bad_channels]
raw.interpolate_bads()

总结

本教程介绍了基于 MNE-Python 的脑电单变量大规模分析完整流程:

步骤
关键要点
预处理
滤波、ICA去伪迹、质量检查
ERP分析
成分识别、拓扑可视化
时频分析
频带分解、ERD/ERS计算
统计检验
聚类排列检验(解决多重比较)

进一步学习

  • MNE 官方文档: https://mne.tools/
  • Maris & Oostenveld (2007): 非参数统计检验经典论文
  • Cohen (2014): 《Analyzing Neural Time Series Data》

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  1. CONNECT:[ UseTime:0.000958s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001207s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000570s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000494s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000916s ]
  6. SELECT * FROM `set` [ RunTime:0.000461s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001099s ]
  8. SELECT * FROM `article` WHERE `id` = 465163 LIMIT 1 [ RunTime:0.002569s ]
  9. UPDATE `article` SET `lasttime` = 1770556182 WHERE `id` = 465163 [ RunTime:0.005287s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000499s ]
  11. SELECT * FROM `article` WHERE `id` < 465163 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000919s ]
  12. SELECT * FROM `article` WHERE `id` > 465163 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000773s ]
  13. SELECT * FROM `article` WHERE `id` < 465163 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001267s ]
  14. SELECT * FROM `article` WHERE `id` < 465163 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001872s ]
  15. SELECT * FROM `article` WHERE `id` < 465163 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013424s ]
0.112622s