Investigating the algorithm of image-processing in brain encountering with repetitive patterns

Background and Aim : When our brain encounters with an image, it sends a comprehensive picture of it including all the objects to Occipital lobe where it is primarily processed and some features are realized (e.g. Surface, edges, etc.). In the next step, this data is sent to a section between Parietal and Occipital to be located precisely. Finally, the processed is done by sending this data to temporal lobe –where the particular part of long term memory used by image-processing is located- so the awareness of those features is recognized. The question that in repeated patterns exists is how the brain covers the whole objects of this wide image in such a short time; what we are looking for in this article.Methods : Subjects were people between 17-22 years old with no history of neural, psychological or vision problems. A 16-channel EEG device was used to extract signals and brainwaves. Then pre-processing was done. Next, in order to investigate the process of brain, a test including different pictures was designed. Each stimulus was shown to subject for 1 second and between each two stimuli there was a 2 second blank screen. This test was repeated many times so the repeatability of each component and diagram is proved.Results : The important point is that a significant activity of theta band of brain was observed in the frontal lobe in a specific time between 300 to 600 ms after the stimulus only in repetitive patterns. In addition to different brainwaves, independent component of eye movement was investigated as well. In first 300 ms after the stimulus no eye movement can be observed in repetitive patterns without distinct object which is in contrary to the ones (both complicated and simple patterns) with a distinct object.Conclusion : In this research we were extracting an algorithm which explains how the brain process a wide repetitive pattern image without any changes in speed of its process. Getting the results together obtained from the tests, we could prove that the brain encounters a repetitive pattern and simultaneously realize that the pattern surrounding the main object have the same features send this data to the frontal lobe where it is duplicated all over the field of vision. This duplication operation is shown by the mentioned theta band activity. So in the result despite the large scale wideness of pattern, we are needless to move our eyes to completely process it. Moreover, the speed of processing in these kinds of patterns is boosted significantly.

Keywords:

Repititive patterns , Vision , EEG , tetha band , Image processing