Table 2 Mean correct raw scores for comprehension of emotional prosody in clear and noise-vocoded speech, in each participant group.

From: Comprehension of acoustically degraded emotional prosody in Alzheimer’s disease and primary progressive aphasia

 

Healthy individuals

AD

lvPPA

nfvPPA

svPPA

Correct Raw Responses

 Clear (/15)

14.71 (0.46)

13.53 (1.36)

13.67 (1.36)

13.10 (1)

13.80 (0.63)

  Vocoded

18 Channels (/15)

12.83 (1.40)

10.87 (2.50)

10.44 (2.56)

10.90 (2.56)

11.80 (1.75)

12 Channels (/15)

12.50 (1.53)

10.40 (2.64)

9.78 (1.72)

10.90 (3.18)

10.60 (2.88)

6 Channels (/15)

11.13 (1.85)

9.13 (2.72)

8.33 (3.24)

10.10 (2.28)

10.50 (2.27)

Combined (/45)

36.46 (3.98)

30.40 (6.23)

28.56 (6.33)*

31.90 (7.29)

32.90 (6.12)

  1. Mean (standard deviation) values are shown. Raw scores are presented (maximum value possible in parentheses). Values significantly different from healthy age-matched individuals (p < 0.05) are in bold and from svPPA noted with *. For clear and vocoded performance at separate channel levels, significant differences were generated using unadjusted Kruskal Wallis tests. For the combined vocoded performance across all channel levels, the model used was a mixed ANCOVA, with vocoding channels as the repeated measure (three levels: six [hard], 12 [medium], 18 [easy]) and diagnosis as the between-subjects factor, adjusting for performance on the control task (performance on clear emotions), and Wechsler Abbreviated Scale of Intelligence (WASI) Matrix Reasoning (as a proxy for disease severity).
  2. AD, patient group with typical Alzheimer’s disease; lvPPA, patient group with logopenic variant primary progressive aphasia; nfvPPA, patient group with nonfluent variant primary progressive aphasia; svPPA, patient group with semantic variant primary progressive aphasia.
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