This semester, the research group conducted two doctoral and master's thesis defenses, which were really strong and the questions raised by experts were in place. Most of the questions are related to the key points of the paper, to the point. These two defenses have provided us with rich examples for reference and benefited a lot. As one of the respondents, I deeply feel that I have gained a lot, both emotionally and theoretically, many of which I couldn't feel only when I heard from others.

From the perceptual point of view, the biggest feeling is that the mentality must be relaxed and not nervous. Excessive nervousness may lead to a blank brain, unable to speak well and answer questions that could have been answered. Therefore, it is very important to build up confidence and eliminate nervousness. Compared with the previous pre-defense, my defense was obviously tense, and I reflected on it. The main reasons are:

Inadequate preparation. The defense must be prepared early, whether it is a paper or a ppt defense, it is best to have a lot of advance. Preparing all the materials needed for the defense in advance can not only ensure enough time to revise and improve, but also give yourself a relaxed psychological space, so as not to be flustered and nervous because of insufficient preparation.

PPT explanation is not skilled enough. Ppt presentation must be practiced skillfully, and it is best to take off the manuscript. If you are skilled, you won't be too nervous, even if you are nervous, it won't be too bad. Moreover, since the notebook can't be displayed in this defense, if you are skilled enough to almost break the manuscript, you won't be so nervous that you are at a loss.

Lack of sleep. Be sure to have a good rest and work regularly before replying. I thought that lack of sleep a few days before the defense would not affect the defense. After all, I won't feel sleepy in a tense atmosphere. But what I didn't expect was that although I didn't feel sleepy, I couldn't control my physical fatigue, my heart was beating very fast easily, and I didn't have enough confidence to speak loudly, let alone my voice trembled when I answered, even when I was chatting privately that day. The trembling voice strengthened my nervousness and passed it on to others. Therefore, don't cram for the Buddha's feet temporarily, lest irregular work and rest bring unexpected negative effects.

From the theoretical knowledge, through this defense, I became more aware of the problems existing in this research and learned a lot, especially the professional criticisms and opinions provided by experts, which further deepened my understanding of this project and made me deeply understand how to do the research better.

First of all, in the selection of comprehensive ERP indicators, experts pointed out several feasible methods for me, such as calculating the effect value to see which indicator is more damaged by learning disabilities, doing regression analysis to find out the indicator that contributes the most or is the most sensitive to the task, and finding out the indicator that contributes the most with the help of mathematical models such as discriminant model and classification model. This also reminds me of a problem, that is, to master a variety of research methods and technologies in daily study, not too single. If we can skillfully use structural equation model and other methods to complete the above problems as soon as possible in a short time, then my thesis may not stay at the shallow level of correlation analysis.

Secondly, the expert's opinion also provided me with new ideas. For example, the new perspective of early identification and prediction of children with learning disabilities put forward by Teacher Luo made me think more deeply about the differential diagnosis of learning disabilities. It is really not the best time to intervene when students' learning disabilities have seriously affected their academic development. Early identification and diagnosis of children with learning disabilities is very important for early education and intervention of such children. How to accurately identify and diagnose whether there are learning disabilities in early childhood children, and how to accurately, conveniently and quickly identify and diagnose them is indeed a problem worthy of our attention. Although it is difficult, it is the focus of future research.

Third, the details must not be ignored in paper writing. In my thesis, I didn't refer to a lot of literature for the explanation of early components of ERP, but only referred to the explanations of my former classmates and took it for granted that early components represented attention. In addition, I heard Mr. Zhao say a few words about early perceptual defects in the early defense, so I simply added the perceptual explanation to the attention explanation of early components, which caused the distinction between perception and attention. A lesson from this question is that I can never forget that learning needs rigor, not hearsay and taking it for granted. We must reasonably explain our experimental results on the basis of referring to a large number of existing research results.

Fourth, the paper should have a certain original spirit. Teacher Zhao's suggestion on ERP composition in my lecture circle and visual space template experiment made me feel something. Similar to CNV paradigm, the waveform obtained is positive wave, not CNV. Teacher Zhao suggested calling it "CPV", which is related to the positive trend. This not only conforms to the characteristics of waveform, but also has originality and certain value. This originality can only be mentioned on the basis of mastering a large number of research materials and accumulating rich research experience. This requires us to consult a lot of literature for each experimental paradigm and compare the ERP waveform in the literature with our own waveform repeatedly. If we can be sure that they represent the same components, we can refer to them. If you are sure they are different, you can try to be original, but you must consult experts and get their approval. Dare to be original, and you can't just label yourself because you can't find similar evidence.

Fifth, we must consult more experts before doing experiments to avoid blindly following the crowd. The outstanding problem in the two defenses is the sampling of DC and AC. "My sister used AC, so I used AC" is indeed a true portrayal of us. Everyone followed the crowd, and no one went to the bottom to find the reason for this setting, which led to a mistake. This is actually a manifestation of the lack of rigor in scientific research. This matter is of far-reaching significance to my education. Do research must study hard and ask more questions, especially in such an era of rapid development of science and technology. Blind persistence will only make me fall behind and even make mistakes.

Sixth, the thesis should have a certain theoretical height, and the experiment should serve the theory. No matter what experiment you do and what technology you use, you should finally raise the results to the theoretical level and reveal what theoretical problems. If only a few results are obtained, the research will lose its due significance and vitality. This is a problem that I have gained a lot in both doctoral and master's defense. In particular, Mr. Peng's sentence "Prove the big theory with small experiments" is instructive and enlightening for my future research.

The above are some gains and reflections of my defense. I think, after the successful defense, we don't have to review the hardships in the experiment and thesis, but we should reflect on the problems and areas that need improvement in the whole process. Only by reflection can we make progress. I believe that through this kind of reflection and arrangement, I will consciously improve or avoid some problems in my future work, hoping to break through myself and make continuous progress.