Dynamic Difficulty Adjustment in a P300 Speller Task for Attention Training
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 51
- 试验地点
- 1
- 主要终点
- Change in response times in the random dot motion task
研究概览
简要总结
This study compares different adaptation approaches in a P300-based BCI neurofeedback training to improve short-term attention. Participants will spell several words on a computer by focusing on a letter on the screen while their brain activity is recorded (P300 speller). The difficulty of this task will be adapted to train their attention. Their cognitive abilities will be evaluated using a random dot kinematogram, where they are asked to indicate the direction a fraction of moving dots on the computer screen is going in, before and after the training to analyse any improvements. Questionnaires will be used to compare the perceived task load of the different adaptation approaches.
详细描述
Healthy participants will complete several runs in a P300-speller task, where the number of flashes per row and column is progressively adapted to their performance (in control group 1 and experimental group) or chosen randomly (in control group 2). Decreasing the number of flashes per row and column makes it harder for the computer to identify the letter the participant is focusing on, which encourages them to improve their focus to maintain their performance. The number of flashes can therefore be interpreted as the task difficulty of the P300 speller task.
The participants will complete a continuous version of the random dot kinematogram, where a fraction of incoherently moving dots will start moving coherently. The participants are asked to indicate which direction these dots are moving in. This task is completed before and after the P300 speller training, so that response times in the task can be compared.
To evaluate the perceived task load of the different adaptation approaches, the participants will complete a questionnaire about fatigue and boredom before and after the training session, as well as the NASA Task Load Index at the end of the experiment.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Other
- 盲法
- Single (Participant)
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •18 years and older
- •able to consent
- •normal or corrected-to-normal vision
排除标准
- •history of neurological or cognitive illnesses
- •negative reaction to electroconductive gel used in the study (an allergy patch test will be carried out before the experiment starts)
- •illiteracy
结局指标
主要结局
Change in response times in the random dot motion task
时间窗: Measured immediately before and after the training block in the experimental session (~1 hour and 30 minutes total)
The change in mean response times for correct responses in the random dot motion task from pre- to post-training is analysed.
Change in alpha power of EEG signals
时间窗: Measured over the course of the training block in the experimental session (~1 hour and 30 minutes total)
The change in mean power of the alpha rhythm in the first 150ms after a non-target stimulus in the P300 speller task is analysed.
Change in accuracy in the random dot motion task
时间窗: Measured immediately before and after the training block in the experimental session (~1 hour and 30 minutes total)
The change in mean accuracy, i.e. number of correct responses over total number of targets, in the random dot motion task from pre- to post-training is analysed.
Change in total power of EEG signals
时间窗: Measured over the course of the training block in the experimental session (~1 hour and 30 minutes total)
The change in mean total power of EEG signals between 150ms to 550ms post-stimulus for target and non-target trials in the P300 speller task is analysed.
Length of training
时间窗: Measured over the course of the training block in the experimental session (~1 hour and 30 minutes total)
The length of the P300 training phase is compared between groups.
次要结局
- Response to NASA Task Load Index questionnaire(Measured immediately after the training block in the experimental session (~1 hour and 30 minutes total))
- Change in spelling accuracy in P300 speller task(Measured immediately before and after the training block in the experimental session (~1 hour and 30 minutes total))
- Change in responses to questionnaire(Measured immediately before and after the training block in the experimental session (~1 hour and 30 minutes total))
研究者
Sandra-Carina Noble
Principal Investigator
National University of Ireland, Maynooth