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Table 2 Time-frequency clusters with significant group differences

From: Neural synchronization deficits linked to cortical hyper-excitability and auditory hypersensitivity in fragile X syndrome

Cluster label

Time range

Peak time

Peak frequency

Statistic

Direction of group difference

Phase-locking (ITC)

 Stimulus onset alpha

252 to 430 ms

288 ms

13 Hz

t(32) = 3.4, p = .002

FXS > CON

 Stimulus offset theta

1883 to 2049 ms

1966 ms

3 Hz

t(32) = 3.62, p = .001

CON > FXS

 Stimulus offset alpha

2084 to 2214 ms

2178 ms

9 Hz

t(32) = 3.20, p = .003

FXS > CON

 Chirp

607 to 1068 ms

761 ms

42 Hz

t(32) = 2.8, p = .008

CON > FXS

 Chirp harmonic

382 to 631 ms

406 ms

50 Hz

t(32) = 2.9, p = .007

CON > FXS

Single trial power

 Overall gamma

−220 to 2722 ms

819 ms

57 Hz

t(32) = 2.8, p = .008

FXS > CON

Baseline corrected single trial power

 Stimulus onset alpha

229 to 335 ms

276 ms

11 Hz

t(32) = 3.0, p = .005

FXS > CON

 80 Hz

855 to 2462 ms

914 ms

82 Hz

t(32) = 3.0, p = .005

CON > FXS

 110 Hz stimulus onset

300 to 619 ms

572 ms

112 Hz

t(32) = 3.0, p = .005

CON > FXS

 110 Hz late

1647 to 2462 ms

2261 ms

112 Hz

t(32) = 3.1, p = .005

CON > FXS

  1. Cluster names are identified by stimulus association and frequency band. Time ranges are given relative to initial stimulus onset, to provide equivalency with the X axes in Fig. 2. Cluster peaks are identified for highest t values, not for peaks of activity. For overall gamma single trial power, a peak statistic is reported; however, it should be noted that group differences were remarkably stable throughout the time period