Figure 1
Experimental setup. (A) Top view of the setup with the right index finger and thumb resting on the start position, and both object positions (black rectangles). (B) Illustration of the backside of the inverted T-shaped object with the three infrared markers (white circles) and the touch sensors fixed to the grasping area of the object. The three tubes in the object’s base were never visible to the participant. The brass mass is depicted to the left of the object.
Figure 2
Mean values for digits‘ separation index. The values are plotted for the different configurations of feature repetitions with regard to the previous trial. Values for the constant and mixed part of the sequence are separated by the vertical line. Negative values indicate that participants positioned their digits in expectation of a repetition of MD that did occur, positive values also reflect this expectation, which, however was not met. Error bars display the 95% Cousineau-Morey within confidence interval.
Figure 3
Mean values for object roll. The values are plotted for the different configurations of feature repetitions with regard to the previous trial. Values for the constant and mixed part of the sequence are separated by the vertical line. Values indicate the absolute maximal tilt angle of the object within the first 250 ms of object lift. Error bars display the 95% Cousineau-Morey within confidence interval.
Figure 4
Correlation between digits’ separation and object roll. Values for digits’ separation are plotted on the x-axis, values for object roll on the y-axis. The two variables show a positive correlation.