|Alternative Title||A Study of Temporal Binding Effects Generated by Voluntary Actions and Neural Mechanism of Time Estimation.|
|Place of Conferral||北京|
|Keyword||自主动作 时间压缩效应 时间估计 按键 抬键 尾状核 小脑 标量计时理论|
|Other Abstract||Voluntary action ispredictable and always accompanied by some consequences, which providesusan instrument toadapt and affect environment. Temporal binding effect is an intrinsic feature of voluntary action. It’s worthwhile to explore it which will deepen our understandingofconsciousness, time perception, action awareness causality and etc. In the present study, we have systematicallyexplored the different binding effects and temporal course in the time perception phasefor both voluntary pressing and releasing actions.In addition, as this temporal binding effect was an illusion in time estimation, we have systematically explored the neural mechanism underlyingtime estimation.|
This study was divided into two parts, including experiment 1-6. In part 1, Experimentswere conducted to explore the different binding effects and temporal course in the time perception phase for both voluntary pressing and releasing actions. Experiment 1 was aimed to explore the different binding effects induced by voluntary pressing and releasing actions. Experiment 2was aimed to explore the difference of detectability between motor and delayed visual stimuli in both voluntary and releasing conditions. Experiment 3 was aimed to explore the suppression of binding effect in both voluntary pressing and releasing conditions. Experiment 4 was designed to explore the temporal course of different binding effects from voluntary pressing and releasing actions in the time perception stage. Part 2 was aimed to explore possible neural mechanism of the time estimation. Experiment 5 used the fMRI to explore the neural mechanism of time estimation in visual (Experiment 5a) and audio (Experiment 5b) modality. Experiment 6 was aimed to explore the neural mechanism of time estimation through the association between structureof brain and performance in time estimation in both visual (Experiment 6a) and audio modality (Experiment 6b).
The main results in our study as followings:
Firstly, temporal binding effect generated by voluntary pressing action was greater than releasing action. This binding effect coexisted for voluntary pressing and releasing when the time interval between action and delayed consequence ranged from 150 to 1050 ms, whilst it was only existed for voluntary releasing when the time intervalwas equal to 150 ms. In addition, results showed that suppression of this effect for pressing condition is less sensitive to the contingency between action and delayed outcome than for voluntary releasing action.
Secondly, the different binding effects between voluntary pressing and releasing condition were reflected in the time perception phase. ERPs results showed that a larger P1 was elicited in voluntary pressing condition than the releasing condition.
Thirdly, our results support the scale time theory. Pre-SMA, caudate,and cerebellum were significantly activated in the time estimation task in both visual and audio modality. The results from the association between performance of time estimation and structure of brain indicated that the volume of cerebellum positively correlated with performance of time estimation, whilst volume of caudate was negatively correlated with performance of time estimation.
Overall, these results provide new evidence to our understanding of the mechanism of temporal bindingeffect and neural mechanism of time estimation.
|赵科. 自主动作的时间压缩效应和时间估计的脑机制[D]. 北京. 中国科学院研究生院,2013.|
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