This Paradigm is designed to evaluate task complexity impact on BCI performance. Our paradigm consist of a control paradigm using ST and a test paradigm using CT. Simple task was defined as a grasping movement. This task was used as a simple task because grasping is a task which is done repetitively every day, as a result it is less likely to induce activities related to planning and cognitive tasks in the human brain. Furthermore, all subjects agreed with the fact that they can perform grasping without any specific focus on the task.
Visual ques were used for task indication. When there were no specific indicator on the red rectangle cue, subjects were instructed to perform kinesthetic to perform kinesthetic motor imagination of grasping for …show more content…
In each trial the subject was given a random cue on the left or right side of the screen indicating the hand side to do motor imagery. Each trial lasted for 8 seconds including 2 seconds of rest with black screen, 1.5 seconds of preparation with the cross fixation appearance on the screen, 3.5 seconds of motor imagery with a red rectangle cue indicating the task for left or right hand motor imagery, and 1 seconds of trial end with a black screen to avoid the interference of brain activity between consecutive trials (Fig.1). Fig. 1. Timing and visual design of a single trial for two different groups of paradigms. (1) LCT-RCT indicates the paradigm related to left and right hand complex, (2) LST-RST indicates left and right hand simple tasks, (3) LCT-Idle indicates left hand complex task and rest state (red rectangle in the middle of the cross), (4) LST-Idle indicated left hand simple task and rest state. In paradigm one, LST-RST is a regular BCI task hence it is taken as control and LCT-RCT is taken as the test experiment. In paradigm two, LST-Idle experiment is control and LCT-Idle is test experiment. The main reason behind the design of two paradigm was to investigate the impact of CT-MI on brain activations and BCI performance regardless of hand domination and avoid any other possible factor which can affect the
Visual ques were used for task indication. When there were no specific indicator on the red rectangle cue, subjects were instructed to perform kinesthetic to perform kinesthetic motor imagination of grasping for …show more content…
In each trial the subject was given a random cue on the left or right side of the screen indicating the hand side to do motor imagery. Each trial lasted for 8 seconds including 2 seconds of rest with black screen, 1.5 seconds of preparation with the cross fixation appearance on the screen, 3.5 seconds of motor imagery with a red rectangle cue indicating the task for left or right hand motor imagery, and 1 seconds of trial end with a black screen to avoid the interference of brain activity between consecutive trials (Fig.1). Fig. 1. Timing and visual design of a single trial for two different groups of paradigms. (1) LCT-RCT indicates the paradigm related to left and right hand complex, (2) LST-RST indicates left and right hand simple tasks, (3) LCT-Idle indicates left hand complex task and rest state (red rectangle in the middle of the cross), (4) LST-Idle indicated left hand simple task and rest state. In paradigm one, LST-RST is a regular BCI task hence it is taken as control and LCT-RCT is taken as the test experiment. In paradigm two, LST-Idle experiment is control and LCT-Idle is test experiment. The main reason behind the design of two paradigm was to investigate the impact of CT-MI on brain activations and BCI performance regardless of hand domination and avoid any other possible factor which can affect the