The Neural Mechanism Of Number Processing Affecting Time Perception

Number encoding is a combination of characterization coding, Involving such as visual, depending on the space and words, and other factors. Temporal order perception is the successive perception of sensory events, which is an important part of temporal perception, including simultaneity, unsimultaneity and sequence. Duration perception is an important part of time perception. It is range of 0-5s. Number, time and space are related to our life, as the basic human cognitive function has caused the researchers of great interest. Especially the relationship between digital and time, from the beginning of 1890, got the attention of researchers, in recent years, more and more research has shown in different cognitive system exist in digital and time interaction.Oliveri found that participants performed more accurately when shorter durations were defined by lower numeric value number and longer durations were defined by higher value number. The phenomenon of digital cause subject time perception got a lot of researchers proof. They found that this effect is stable exist regardless whatever the attributes of stimulate physical, time course, or the background of it. Xuan used ERP to explore the influence stage and neural mechanisms. They found that CNV were enhanced compared small number to big number. One explanation of it is that subsequent expectation may be involved in this modulation. But this research has deficiencies.1. Small number and big number has significant difference in both Nl and CNV, range from early perceptual processing to late decision making, but they reported that the effect is only focus on early stage. 2. They found that compared to big digits, small number has a higher subsequent expectation, but in the current paradigm, number 4 present 800ms, time and number factor appeared and disappear meanwhile, its authenticity is questionable.3. Humans can process task digital and time information meanwhile in time task. The sensitivity and show that digital automation higher than time higher levels of processing. According to this, although is experiments with current digital subjects were told nothing, just as attention task clues, but the process existing digital processing. Oliveri discovered automatically activated in time the amount of information consciousness, but they explain it as perception identify. So, the existing research may hybrid digital processing and time information processing.Range-synthetic Model of Temporal Cognition agreed that man with piecewise for time, regardless of cognition for which a timescales cognitive are influenced by many factors. And Walsh's ATOM argued that time, space and number are parts of a comprehensive system, shared same neural mechanism. According to this, this research aim to separate time processing and number processing to explore the Neural Mechanism of Number Processing Affecting Time perception.Study one investigated whether the Small probability's time perception is affected by big probability. It use bisection task, subjects judge current time were close to standard short time or standard long time. The result is that Small probability's time perception is affected by big probability. Whatever the stimulation is, subject is prone to underestimate the small number's time and overestimate the big number's time.Study two separates time processing and number processing to explore the Neural Mechanism of Number Processing Affecting Time perception. It used two-choice oddball paradigm, subjects' task is judging the time course. The result is that in square stimulation, small number and big number have a significant in CNV, and in number stimulation, mall number and big number have a significant both in N1, P2 and CNV.The present study explores that number processing affect the decision making level, not the perceptual level. It is ought to integrate time perception with other factors, such as the physical features of stimuli, cognitive factors and personality traits.