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1.
Fig. 6

Fig. 6. From: Histological Asymmetries of Primary Motor Cortex Predict Handedness in Chimpanzees (Pan troglodytes).

Bivariate plots of predictors of coordinated bimanual handedness index from multiple regression analysis, presented in the order of the strength of the relationship (A–D). Open circles indicate right-handed subjects; closed circles indicate nonright-handed subjects.

CHET C. SHERWOOD, et al. J Comp Neurol. ;503(4):525-537.
2.
Fig. 5

Fig. 5. From: Histological Asymmetries of Primary Motor Cortex Predict Handedness in Chimpanzees (Pan troglodytes).

The population-level mean asymmetry quotient (AQ) for neuroanatomical measures in the sample of 18 chimpanzees. Positive AQs represent rightward bias and negative AQs represent leftward bias. Bars indicate mean, error bars indicate ± standard deviation.

CHET C. SHERWOOD, et al. J Comp Neurol. ;503(4):525-537.
3.
Fig. 4

Fig. 4. From: Histological Asymmetries of Primary Motor Cortex Predict Handedness in Chimpanzees (Pan troglodytes).

Image conversion method for measurement of areal fraction (AF). An image frame of Nissl-staining in layer II/III is shown (A). Images were processed with background subtraction and conversion to binary to measure the proportion of spaced occupied by stained cells (B). Scale bar = 50 μm.

CHET C. SHERWOOD, et al. J Comp Neurol. ;503(4):525-537.
4.
Fig. 2

Fig. 2. From: Histological Asymmetries of Primary Motor Cortex Predict Handedness in Chimpanzees (Pan troglodytes).

Examples of histological staining in chimpanzee primary motor cortex (Brodmann’s area 4). Staining for Nissl substance with cresyl violet (A), nonphosphorylated neurofilament protein with cresyl violet counterstain (B), and parvalbumin with cresyl violet counterstain (C) are shown. Scale bar = 50 μm.

CHET C. SHERWOOD, et al. J Comp Neurol. ;503(4):525-537.
5.
Fig. 1

Fig. 1. From: Histological Asymmetries of Primary Motor Cortex Predict Handedness in Chimpanzees (Pan troglodytes).

The region of the hand knob landmark as seen in four axial MRI sections of a chimpanzee brain from dorsal to ventral (A–D). Blue lines indicate the tracing of the central sulcus (CS). The horizontal epsilon or inverted omega that projects into the precentral gyrus was traced on each image, shown here in yellow. The dorsal and ventral edges of the knob defined the boundaries of the area measured.

CHET C. SHERWOOD, et al. J Comp Neurol. ;503(4):525-537.
6.
Fig. 3

Fig. 3. From: Histological Asymmetries of Primary Motor Cortex Predict Handedness in Chimpanzees (Pan troglodytes).

The part of primary motor cortex (Brodmann’s area 4) that was sampled for quantitative measurements. Only the intrasulcal portion of the precentral gyrus was analyzed (A). Arrowheads illustrate the typical borders used in defining the region of interest. A higher magnification view of the cytoarchitecture from the segment of primary motor cortex indicated by the dashed line box in A is shown in B. The layers boundaries that were defined for various quantitative measurements are shown in B. PoG, postcentral gyrus; PrG, precentral gyrus; wm, white matter. Scale bar = 500 μm in B.

CHET C. SHERWOOD, et al. J Comp Neurol. ;503(4):525-537.

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