Id |
Subject |
Object |
Predicate |
Lexical cue |
T1 |
0-102 |
DRI_Approach |
denotes |
Encoding of movement direction in different frequency ranges of motor cortical local field potentials. |
T2 |
103-278 |
DRI_Unspecified |
denotes |
Recent studies showed that the low-frequency component of local field potentials (LFPs) in monkey motor cortex carries information about parameters of voluntary arm movements. |
T3 |
279-419 |
DRI_Outcome |
denotes |
Here, we studied how different signal components of the LFP in the time and frequency domains are modulated during center-out arm movements. |
T4 |
420-608 |
DRI_Outcome |
denotes |
Analysis of LFPs in the time domain showed that the amplitude of a slow complex waveform beginning shortly before the onset of arm movement is modulated with the direction of the movement. |
T5 |
609-838 |
DRI_Approach |
denotes |
Examining LFPs in the frequency domain, we found that direction-dependent modulations occur in three frequency ranges, which typically increased their amplitudes before and during movement execution: < or =4, 6-13, and 63-200 Hz. |
T6 |
839-906 |
DRI_Approach |
denotes |
Cosine-like tuning was prominent in all signal components analyzed. |
T7 |
907-1072 |
DRI_Background |
denotes |
In contrast, activity in a frequency band approximately 30 Hz was not modulated with the direction of movement and typically decreased its amplitude during the task. |
T8 |
1073-1228 |
DRI_Outcome |
denotes |
This suggests that high-frequency oscillations have to be divided into at least two functionally different regimes: one approximately 30 Hz and one >60 Hz. |
T9 |
1229-1430 |
DRI_Outcome |
denotes |
Furthermore, using multiple LFPs, we could show that LFP amplitude spectra can be used to decode movement direction, with the best performance achieved by the combination of different frequency ranges. |
T10 |
1431-1594 |
DRI_Outcome |
denotes |
These results suggest that using the different frequency components in the LFP is useful in improving inference of movement parameters from local field potentials. |