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Table 2. 

Acoustic Properties and Behavioral Ratings by Sound Category

Sound Category
Duration (msec)
Intensity (db)
Pitch (Hz)
Harmonicity (db)
Communicativeness
Emotion
Valence
Communicative Signals 
Infant-directed speech 895 (240) 70.2 (.3) 289 (55) 15.0 (3.8) 553 (19) 417 (43) 450 (41) 
Adult-directed speech 623 (91) 70.0 (.6) 228 (31) 9.8 (4.1) 552 (19) 304 (32) 331 (27) 
Communicative vocal nonspeech 729 (180) 70.5 (.1) 267 (59) 13.1 (5.9) 591 (25) 482 (95) 308 (194) 
Mean for communicative signals 749 (210) 70.2 (.4) 261 (13) 12.6 (5.1) 565 (26) 401 (97) 363 (129) 
 
Noncommunicative Signals 
Noncommunicative vocal nonspeech 838 (452) 70.2 (.5) 303 (67) 8.7 (7.7) 280 (151) 208 (93) 278 (38) 
Rhesus macaque calls 724 (328) 70.6 (.3) 335 (116) 7.9 (8.2) 281 (132) 258 (119) 274 (54) 
Clapping 737 (182) 67.9 (1.8)  −1.4 (1.1) 347 (23) 239 (20) 391 (11) 
Walking 831 (92) 68.3 (1.1) 217 (125) 0.7 (1.4) 123 (19) 88 (11) 314 (11) 
Water 747 (473) 70.1 (.5) 356 (86) −0.4 (2.2) 58 (15) 54 (11) 324 (15) 
Mean for noncommunicative signals 775 (324) 69.4 (1.5) 306 (13) 3.1 (6.6) 218 (141) 170 (107) 317 (52) 
Sound Category
Duration (msec)
Intensity (db)
Pitch (Hz)
Harmonicity (db)
Communicativeness
Emotion
Valence
Communicative Signals 
Infant-directed speech 895 (240) 70.2 (.3) 289 (55) 15.0 (3.8) 553 (19) 417 (43) 450 (41) 
Adult-directed speech 623 (91) 70.0 (.6) 228 (31) 9.8 (4.1) 552 (19) 304 (32) 331 (27) 
Communicative vocal nonspeech 729 (180) 70.5 (.1) 267 (59) 13.1 (5.9) 591 (25) 482 (95) 308 (194) 
Mean for communicative signals 749 (210) 70.2 (.4) 261 (13) 12.6 (5.1) 565 (26) 401 (97) 363 (129) 
 
Noncommunicative Signals 
Noncommunicative vocal nonspeech 838 (452) 70.2 (.5) 303 (67) 8.7 (7.7) 280 (151) 208 (93) 278 (38) 
Rhesus macaque calls 724 (328) 70.6 (.3) 335 (116) 7.9 (8.2) 281 (132) 258 (119) 274 (54) 
Clapping 737 (182) 67.9 (1.8)  −1.4 (1.1) 347 (23) 239 (20) 391 (11) 
Walking 831 (92) 68.3 (1.1) 217 (125) 0.7 (1.4) 123 (19) 88 (11) 314 (11) 
Water 747 (473) 70.1 (.5) 356 (86) −0.4 (2.2) 58 (15) 54 (11) 324 (15) 
Mean for noncommunicative signals 775 (324) 69.4 (1.5) 306 (13) 3.1 (6.6) 218 (141) 170 (107) 317 (52) 

Values are given as mean (standard deviation). Communicativeness and emotion are rated on a scale from 0 (least) to 660 (most). Valence is rated on a scale from 0 (most negative) to 660 (most positive).

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