چكيده به لاتين
Development in data recording techniques have made it possible for scientists to better understand the relationship between the activity of one specific brain area and mental functions.
Despite numerous studies in cognitive science field, so many issues such as " Binding" problem remains unsolved. Binding is one of the brain abilities that determines how activated neural patterns related to specific features of an object.
In this study we investigate the encoding of visual features, color and orientation and their binding in brain by using spectral features and classification. To do that we designed a task including six stimuli that are presented randomly during a trial in a delay match to sample structure. In this structure subject should report match or non match between stimulus presented in sample and test part in both color and orientation aspect. Brain signals were recorded from 15 subjects with normal vision.
The results show that color information can be decoded from test part of a trial in delta and theta frequency bands in frontal area, alpha and gamma frequency bands in occipital area and Beta frequency band in frontal area within 500-700 ms of the test part of a trial and with a performance of 65%.
Orientation information can be decoded from sample part of a trial in delta frequency band in occipital and temporal areas, theta frequency band in frontal area, alpha frequency band in occipital area and beta frequency band in occipital area within first 400 ms of the test part of a trial with a performance of 67%.
Binding information also can be decoded from sample part in theta frequency band in frontal area, alpha frequency band in central and occipital areas, beta frequency band in frontal, temporal and occipital areas and gamma frequency band in temporal and occipital areas within a 200-500 ms of a sample part of a trial with a performance of 76%.
