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Using only the sound trajectories classified as ISSM, which we could also catalog as basic movements, we began our analysis by establishing the most probable number of abilities that could be present in the detection of the eight basic movements. The results of factor analysis are presented in Table 3, in which rows contain the eight basic movements used for the analysis and columns show the three extracted attributes. The numbers in each cell, called loadings, indicate the degree to which these attributes are represented by the variables (the schemas in this case). A value of zero means the attribute is not represented by a given variable at all, and a value of one means it is perfectly represented. By convention, cells are left blank when their loading is below 0.3, because this is considered a negligible value. The names of the columns were assigned according to the previously described three axes of sound localization.

Table 3.

Rotated Loadings Matrix

MovementDistanceAzimuthElevation
Up–Down   1.00 
Down–Up   0.64 
Front–Back 0.73   
Back–Front 0.53  0.44 
Left–Right  0.97  
Right–Left  0.88  
In–Out 0.88   
Out–In 0.76   
MovementDistanceAzimuthElevation
Up–Down   1.00 
Down–Up   0.64 
Front–Back 0.73   
Back–Front 0.53  0.44 
Left–Right  0.97  
Right–Left  0.88  
In–Out 0.88   
Out–In 0.76   

As in the correlation matrix, 0 means the variable is completely independent and has no relation to the spatial movements described in the columns of Figure 5. A loading of 1 implies a perfect association with the construct. Values lower than 0.3 were omitted.

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