TABLE 1.
Individual hand preferences and frequencies of left- and right- hand responses for unimanual reaching and bimanual feeding.
| Bimanual Feeding | Unimanual Reaching | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Subject | age | sex | # L | # R | HI | z | Hand | # L | # R | HI | z | Hand |
| Kudzoo | 14 | F | 48 | 251 | 0.68 | 11.74 | R | 75 | 109 | 0.18 | 2.51 | R |
| Sukari | 9 | F | 17 | 199 | 0.84 | 12.38 | R | 67 | 92 | 0.16 | 1.98 | R |
| Kiniani | 24 | F | 12 | 60 | 0.67 | 5.66 | R | 75 | 65 | −0.07 | −0.85 | A |
| Olympia | 11 | F | 64 | 140 | 0.37 | 5.32 | R | 103 | 27 | −0.58 | −6.67 | L |
| Choomba | 44 | F | 13 | 79 | 0.72 | 6.88 | R | 60 | 54 | −0.05 | −0.56 | A |
| Lulu | 8 | F | 39 | 140 | 0.56 | 7.55 | R | 57 | 52 | −0.05 | −0.48 | A |
| Kashata | 14 | F | 6 | 40 | 0.74 | 5.01 | R | 49 | 53 | 0.04 | 0.40 | A |
| Kuchi | 23 | F | 25 | 32 | 0.12 | 0.93 | A | 42 | 42 | 0.00 | 0.00 | A |
| Machi | 31 | F | 29 | 65 | 0.38 | 3.71 | R | 29 | 43 | 0.19 | 1.65 | A |
| Shamba | 48 | F | 1 | 22 | 0.91 | 4.38 | R | 15 | 17 | 0.06 | 0.35 | A |
| Macy B | 2 | F | 26 | 18 | −0.18 | −1.21 | A | 6 | 10 | 0.25 | 1.00 | A |
| Kali | 2 | F | 1 | 4 | - | - | - | 6 | 8 | - | - | - |
| Susie | 4 | F | 47 | 14 | −0.54 | −4.23 | L | 30 | 62 | 0.35 | 3.34 | R |
| Madini | 13 | F | 28 | 41 | 0.19 | 1.57 | A | 31 | 15 | −0.35 | −2.36 | L |
| Bulera | 20 | F | 16 | 46 | 0.48 | 3.81 | R | 29 | 40 | 0.16 | 1.32 | A |
| Bahati | 18 | F | 22 | 38 | 0.27 | 2.07 | R | 31 | 30 | −0.02 | −0.13 | A |
| Kowali | 31 | F | 13 | 53 | 0.61 | 4.92 | R | 21 | 32 | 0.21 | 1.51 | A |
| Makari | 22 | F | 14 | 53 | 0.58 | 4.76 | R | 6 | 59 | 0.82 | 6.57 | R |
| Tabibu | 17 | F | 0 | 63 | 1.00 | 7.94 | R | 6 | 16 | 0.45 | 2.13 | R |
| Rollie | 12 | F | 5 | 73 | 0.87 | 7.70 | R | 18 | 34 | 0.31 | 2.22 | R |
| Charlie | 11 | M | 40 | 115 | 0.48 | 6.02 | R | 95 | 91 | −0.02 | −0.29 | A |
| Taz | 18 | M | 56 | 24 | −0.40 | −3.58 | L | 67 | 79 | 0.08 | 0.99 | A |
| Stadi | 16 | M | 139 | 128 | −0.04 | −0.67 | A | 86 | 42 | −0.34 | −3.89 | L |
| Ivan | 45 | M | 0 | 0 | - | - | - | 56 | 47 | −0.09 | −0.89 | A |
| Kekla | 18 | M | 69 | 129 | 0.30 | 4.26 | R | 39 | 50 | 0.12 | 1.17 | A |
| M’bely | 5 | M | 3 | 49 | 0.88 | 6.38 | R | 37 | 48 | 0.13 | 1.19 | A |
| Kidogo | 9 | M | 5 | 30 | 0.71 | 4.23 | R | 7.00 | 38 | 0.69 | 4.62 | R |
| Jasiri | 9 | M | 28 | 44 | 0.22 | 1.89 | A | 2.00 | 28 | 0.87 | 4.75 | R |
| Ozoom | 46 | M | 21 | 73 | 0.55 | 5.36 | R | 11 | 4 | −0.47 | −1.81 | A |
| Gunther | 1 | M | 10 | 18 | 0.29 | 1.51 | A | 4 | 1 | - | - | - |
| Kazi | 2 | M | 0 | 3 | - | - | - | 3 | 2 | - | - | - |
| Kwan | 20 | M | 47 | 14 | −0.54 | −4.23 | L | 29 | 33 | 0.06 | 0.51 | A |
| Jojo | 29 | M | 44 | 18 | −0.42 | −3.30 | L | 25 | 49 | 0.32 | 2.79 | R |
| Azizi | 6 | M | 35 | 25 | −0.17 | −1.29 | A | 25 | 30 | 0.09 | 0.67 | A |
| Amare | 4 | M | 10 | 48 | 0.66 | 4.99 | R | 29 | 33 | 0.06 | 0.51 | A |
F: Female; M: Male; # L: number of left-hand responses; # R: number of right-hand responses; HI: Handedness Index score that corresponds to degree of manual asymmetry, the sign indicates the direction of the manual bias (negative value: left-hand bias, positive value: right-hand bias); z: individual z-score; Hand: hand preference; R: right-handed subject; L: left-handed subject; A: ambiguous handed subject. Italicized names indicate those gorillas from Lincoln Park Zoo.