Table 3 Theory of mind tests of patients with dementia with Lewy bodies, patients with Alzheimer’s disease and healthy elderly control subjects

Ekman’s Facial Emotion Recognition test

 Impaired subjects

12.5 %

28.6 %

23.1 %

χ² = 0.830, P = 0.660

 Total score on scale of 35

28.6 (3.2)

27.1 (3.3)

26.6 (2.8)

H = 2.39, P = 0.303

 Happiness on scale of 5

5 (0)

4.8 (0.4)

4.8 (0.4)

H = 3.244, P = 0.197

 Fear on scale of 5

2.1 (1.3)

2.1 (1.3)

1.9 (1.6)

H = 0.295, P = 0.863

 Disgust on scale of 5

4.3 (0.8)

4 (1)

4.3 (1.3)

H = 3.337, P = 0.189

 Anger on scale of 5)

3.6 (1.3)

3.9 (1.1)

3.6 (1.3)

H = 0.344, P = 0.842

 Surprise on scale of 5

4.9 (0.3)

4.1 (0.7)

4.1 (0.6)

H = 15.573, P = 0.001

HC > DLB and AD

 Sadness on scale of 5

3.7 (1.3)

3.8 (1.1)

3.5 (1.4)

H = 0.174, P = 0.917

 Neutral on scale of 5

4.9 (0.3)

4.5 (1)

4.5 (0.7)

H = 3.774, P = 0.151

Reading the Mind in the Eyes test

 Impaired subjects

14.3 %

48.4 %

33.3 %

χ² = 4.066, P = 0.131

 Total score on scale of 36

23.9 (2.8)

20.6 (4.2)

21.6 (3.4)

H = 8.425, P = 0.015

HC > DLB

Faux Pas Recognition test

 Impaired subjects

12.5 %

42.3 %

43.9 %

χ² = 5.301 P = 0.071

 Faux pas stories on scale of 30

23.8 (4.2)

19.3 (5.3)

20.6 (6)

H = 6.817, P = 0.033

HC > DLB

 Corrects hits on scale of 5

4.8 (0.4)

4.3 (1)

4.4 (0.9)

H = 2.61, P = 0.271

 Question 3, %

84.1 (18.4)

76.4 (25.3)

75.5 (16.3)

H = 1.761, P = 0.415

 Question 4, %

48.1 (24.3)

35.5 (26.5)

33.6 (26.4)

H = 3.091, P = 0.213

 Intentionality, %

80.9 (22.2)

82.5 (20.1)

69.2 (28.3)

H = 2.611, P = 0.271

 Emotional attribution, %

89.1 (15.4)

71.4 (26.4)

83 (17.5)

H = 5.493, P = 0.064

 Correct rejection on scale of 10

9.6 (1.1)

8.9 (2)

8.7 (2.2)

H = 2.04, P = 0.361

 CQ on scale of 20

19.9 (0.3)

19.2 (1.7)

19.1 (1)

H = 5.868, P = 0.053

Mini-SEA on scale of 30

24.7 (2.4)

21.9 (2.9)

22.7 (2.2)

H = 9.682, P = 0.008

HC > DLB