Table 1. P.AllLifts—matrix describing all single trials.

Column	Variable	Unit	Description
1	Part	integer	Participant number
2	Run	integer	Series number
3	Lift	integer	Sequential trial within series
4	CurW	integer	Current weight—[1=165 g, 2=330 g, 4=660 g]
5	CurS	integer	Current surface—[1=sandpaper, 2=suede, 3=silk]
6	PrevW	integer	Weight in previous Lift—[1=165 g, 2=330 g, 4=660 g]
7	PrevS	integer	Surface in previous Lift—[1=sandpaper, 2=suede, 3=silk]
8	StartTime	seconds	Start time relative to start of series.
9	LEDOn	seconds	Time when the LED in the Perspex plate was turned on; this the signal to the participant to commence a Lift (always 2 )
10	LEDOff	seconds	Time when the LED in the Perspex plate was turned off; this was the signal to the participant to replace the object
11	BlockType	integer	Type of Series—[1=Weight series; 2=Friction series; 3=Mixed weight and friction series]
12	tIndTouch	seconds	Time when the index finger touched the object
13	tThumbTouch	seconds	Time when the thumb touched the object
14	tFirstDigitTouch	seconds	Time when the first digit touched the object
15	tBothDigitTouch	seconds	Time when both digits have touched the object
16	tIndStartLoadPhase	seconds	Time when the index finger start to apply load force
17	tThuStartLoadPhase	seconds	Time when the thumb finger start to apply load force
18	tBothStartLoadPhase	seconds	Time when both digits have started to apply load force
19	tLiftOff	seconds	Time when the object lifted off from the support
20	tReplace	seconds	Time when the object was replaced on the support
21	tIndRelease	seconds	Time when the index finger released the object
22	tThuRelease	seconds	Time when the thumb released the object
23	tBothReleased	seconds	Time when both digits have released the object
24	GF_Max	N	Maximum grip force (mean of the maximum GF applied by the index finger and the thumb)
25	LF_Max	N	Maximum load force (sum of the maximum LF applied by the index finger and the thumb)
26	dGF_Max	N/s	Maximum GF rate
27	dLF_Max	N/s	Maximum LF rate
28	tGF_Max	seconds	Time when the maximum GF occurred
29	tLF_Max	seconds	Time when the maximum LF occurred
30	tdGF_Max	seconds	Time when the maximum GF rate occurred
31	tdLF_Max	seconds	Time when the maximum LF rate occurred
32	GF_hold	N	Mean GF in a 200 ms time window starting 300 ms before LEDOff
33	LF_hold	N	Mean LF in a 200 ms time window starting 300 ms before LEDOff
34	tHandStart	seconds	Time when the hand starts to move (after LEDOn)
35	tHandStop	seconds	Time when the hand stops (returned to blue area)
36	tPeakVelHandReach	seconds	Time when the tangential hand velocity reaches its maximum during the reaching phase
37	tPeakVelHandRetract	seconds	Time when the tangential hand velocity reaches its maximum during the retraction phase
38	GripAparture_Max	cm	Maximum grip aperture (MGA) during the reaching movement
39	tGripAparture_Max	seconds	Time of MGA
40	Dur_Reach	seconds	Duration of the reaching phase (from start of hand movement to initial object touch)
41	Dur_Preload	seconds	Duration of the preload phase, i.e., from digit contact until LF application commenced
42	Dur_LoadPhase	seconds	Duration of the load phase, i.e., from LF was applied until object lift-off
43	Dur_Release	seconds	Duration of the release phase, i.e., from moment the object was replaced on the table (tReplace) until both digits had released the object