Coherence
Undergraduate Category: Physical and Life Sciences Degree Level: Bachelor of Science Abstract ID# 912
How do Neurons Interact while Learning a New Skill? Courtney
20 15
200
10
100 0
2
4 6 Session
8
L Chan
60
1010
50 30 30 30
1515
Angle Phase Error
31 31 Time Time (s) (s) Time (s)
L Chan
R Chan
R Chan
Comparison across sessions and task conditions
② EEG: Coherence between the EEG channels was calculated in a pair-wise fashion at 20 Hz.
Interhemispheric Coherence
55 55 50 30 30 31 31 30 31 TimeTime (s) (s) Time (s)
00
55
400 300 300 300 200 200 200 100 100 100 0 0 0
Interhemispheric Coherence
60
Phase ((deg) Phase deg)
60
65
Onset Angle Speed
70
55
R Chan
R Chan
Motor Area
*
Phase (deg)
65 60
70
Learning curves of a participant
Asymmetric, Mid L Chan
Asymmetric, First
Group comparison between First and Mid
400 400
1010
Angle (deg)
70
80
Angle (deg)
75
Angle (deg)
75 70
300 100 100 200 50 50 100 0 0 0
1515
150 150
Bimanual 3:1 polyrhythmic task 10 participants completed practice.
www.gtec.at
Right:%Perturba6on% Right:%Perturba6on% Phase Error
Velocity (deg/s) Speed(deg/s) Velocity (deg/s)
80
Angle (deg) Angle (deg)
80
Ongoing Research
Coherence
Right Hemisphere
RetenNon
Data Analysis ① Behavior: Peak speed for DISCRETE, Phase error for RHYTHMIC 80
10
Interhemispheric (IH) coherence is normalized After subtracting intra-hemispheric coherences
4 EEG sessions
Peak Speed
8
Coherence matrix of a single participant
months retention 2 73484 5 8 910 months years 1 2 3 41 51263 6 months 5910 6 67 78 20 910 8 years 8 8years 202062 6months
85
6 Session
Pxx and Pyy: auto-spectral density of channel x and y. Pxy: cross-spectral density between x and y.
Coherence
Left Hemisphere
+2 unimanual control
85
4
Results: EEG
Channel Layout
session trials 16 bimanual 1 session = 15 trials 1 1session = =1515 trials
Le#:%Peak%Velocity% Le#:%Peak%Velocity%
2
• As participants practiced, peak speed increased significantly. • Phase error was reduced with practice, but not eliminated.
1 trial = 45 s (approx. 10 reaches)
Last
5 0
10
1 trial 1 = 1trial 45trial s= =4545s s
First Mid
Left only Bimanual
0.4 0.2 0
First
Mid
0.7 0.6 0.5
*
Errorbars: s.e.m. * p
How do Neurons Interact while Learning a New Skill? Courtney
20 15
200
10
100 0
2
4 6 Session
8
L Chan
60
1010
50 30 30 30
1515
Angle Phase Error
31 31 Time Time (s) (s) Time (s)
L Chan
R Chan
R Chan
Comparison across sessions and task conditions
② EEG: Coherence between the EEG channels was calculated in a pair-wise fashion at 20 Hz.
Interhemispheric Coherence
55 55 50 30 30 31 31 30 31 TimeTime (s) (s) Time (s)
00
55
400 300 300 300 200 200 200 100 100 100 0 0 0
Interhemispheric Coherence
60
Phase ((deg) Phase deg)
60
65
Onset Angle Speed
70
55
R Chan
R Chan
Motor Area
*
Phase (deg)
65 60
70
Learning curves of a participant
Asymmetric, Mid L Chan
Asymmetric, First
Group comparison between First and Mid
400 400
1010
Angle (deg)
70
80
Angle (deg)
75
Angle (deg)
75 70
300 100 100 200 50 50 100 0 0 0
1515
150 150
Bimanual 3:1 polyrhythmic task 10 participants completed practice.
www.gtec.at
Right:%Perturba6on% Right:%Perturba6on% Phase Error
Velocity (deg/s) Speed(deg/s) Velocity (deg/s)
80
Angle (deg) Angle (deg)
80
Ongoing Research
Coherence
Right Hemisphere
RetenNon
Data Analysis ① Behavior: Peak speed for DISCRETE, Phase error for RHYTHMIC 80
10
Interhemispheric (IH) coherence is normalized After subtracting intra-hemispheric coherences
4 EEG sessions
Peak Speed
8
Coherence matrix of a single participant
months retention 2 73484 5 8 910 months years 1 2 3 41 51263 6 months 5910 6 67 78 20 910 8 years 8 8years 202062 6months
85
6 Session
Pxx and Pyy: auto-spectral density of channel x and y. Pxy: cross-spectral density between x and y.
Coherence
Left Hemisphere
+2 unimanual control
85
4
Results: EEG
Channel Layout
session trials 16 bimanual 1 session = 15 trials 1 1session = =1515 trials
Le#:%Peak%Velocity% Le#:%Peak%Velocity%
2
• As participants practiced, peak speed increased significantly. • Phase error was reduced with practice, but not eliminated.
1 trial = 45 s (approx. 10 reaches)
Last
5 0
10
1 trial 1 = 1trial 45trial s= =4545s s
First Mid
Left only Bimanual
0.4 0.2 0
First
Mid
0.7 0.6 0.5
*
Errorbars: s.e.m. * p
