Table 1 Head turn index and number of subjects that did not turn their head (no) and that turned their head to the right side (R) or to the left side (L) for conspecific and control playback stimuli (non-biological sound; heterospecific evolutionarily far related species; heterospecific evolutionarily closely related species).

Conspecific communication sounds

Whistle

31

8

10

2

0.67*

5

6

-0.09

Tsak

33

5

11

2

0.69*

7

8

-0.07

Trill

28

0

10

6

0.25

4

8

-0.33

Non-biological sounds

Noise

37

11

7

6

0.08

5

8

-0.23

12 kHz

30

10

6

3

0.33

6

5

0.09

Heterospecific evolutionarily far related species

Bat

31

9

8

4

0.33

6

4

0.20

Heterospecific evolutionarily closely related species ( Microcebus lehilahytsara )

Whistle

28

6

7

4

0.27

6

5

0.09

Tsak

32

4

11

3

0.57

9

5

0.29

Trill

29

7

7

6

0.08

3

6

-0.33

Heterospecific evolutionarily closely related species ( Microcebus ravelobensis )

Whistle

33

7

6

8

-0.14

7

5

0.17

Tsak

26

4

6

7

-0.08

6

3

0.33

Trill

27

3

5

6

-0.09

8

5

0.23