Fig 1.
EEG recordings time-aligned to sign language and time-reversed video stimuli were processed along two parallel streams: (top) spectral feature analysis submitted to linear mixed-effects models examining effects of stimulus type and age; and (bottom) coherence between EEG and optical flow of the stimuli, with amplitude and timing features selected using ML pipeline (UFS → RFE) prior to age correlation analyses.
Table 1.
Summary of significant spectral effects of Age and Stimulus across brain regions.
Fig 2.
Behavioral results for sign language and time-reversed video conditions.
(A) Acceptability ratings (7-point Likert scale) were significantly higher for sign language than reversed videos. (B) Reaction times did not differ significantly between conditions.
Fig 3.
Frontal neural response latency increases with age during non-linguistic visual motion processing.
Scatter plot showing a significant positive correlation between participant age and frontal timeshift at 0.2 Hz in the time-reversed video condition (linear fit with 95% confidence interval shown).
Fig 4.
Posterior neural coherence to sign language increases with age.
Scatter plot showing a significant positive correlation between participant age and posterior EEG coherence at 0.4 Hz in the sign language condition (linear fit with 95% confidence interval shown).