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Fig. 1 | Alzheimer's Research & Therapy

Fig. 1

From: Retained capacity for perceptual learning of degraded speech in primary progressive aphasia and Alzheimer’s disease

Fig. 1

Broadband time-frequency spectrograms of sine-wave and natural speech. Examples of natural speech stimuli are shown in the top panels, and corresponding sine-wave replicas are shown in the bottom panels. The y-axes code frequency (kilohertz), and the x-axes code time (milliseconds). The centre frequencies of the three sine-wave contours track the centre frequencies of the formants in each of the natural stimuli. Depicted are examples of the two types of speech stimuli used in the experiment: three-digit numbers (‘nine hundred and sixty-five’; left panels) and geographical place names (‘Germany’; right panels). Sound recordings of these stimuli are available in Additional files 1, 2, 3, and 4

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