چكيده به لاتين
The reliable evidence of the existence of binding in visual perception is the error in the combination of features. In the visual perception process of a scene, when there is more than one object, there is a possibility of a mistake in the binding of features, which is called binding error. For example, whenever there is a red square and a green circle at the same time, one may perceives the correct objects, such as a red circle beside a green square rather than a red square and a green circle. In 1980, Anne Treisman proposed the feature integration theory or FIT for the first time. FIT considers attention as the main Key in the integration of features. This theory hypothesize that for every possible feature, there is a mental map in the visual cortex, which is called feature map. However, this model has been discussed in behavioral studies in the field of perception and has not yet been generalized in the working memory. Therefore, the aim of this project is to investigate this model in the area of visual short-term memory (VSTM) using EEG signals and GLM method. In this project, three visual dimensions in the form of color, shape, and orientation are chosen, and in the GLM model, these three visual features constitute three independent parameters. According to Anne Treisman's theory, location also plays an essential role in modeling, so by choosing the right and left locations in the field of vision, we will reach a model with six independent parameters. Therefore, to design the considered experiment, the three features of color, orientation and shape and the location of the object will be used to obtain a spatial map.
The results of this project show that for the rapid presentation of a visual stimulus - consisting of three dimensions - the binding structure of color or orientation features in the occi-parietal region of the brain can be seen as distinct sources. Therefore, the Phase coherency values of the modeled signal, for the color and orientation feature in the occipital region, showed a significant difference (p<0.05) in the alpha and theta bands respectively, as well as in the time window of 15-151 milliseconds and 365-212 milliseconds. Meanwhile, no significant difference was seen in other frequency bands as well as their power and Event-related-oscillation (ERO) values. Therefore, it can be concluded that these results are consistent with the concept of FIT generalization in visual working memory.
