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The ability to absorb and detect minute changes in facial expressions allows us to essentially " read minds " if we pay attention . My research interests focus on age-related changes in cognitive functioning . Table 7.2 reports the regression coefficients and asymmetry tests for each location up to Western Canada relative to U.S. Gulf price changes for anhydrous ammonia . They indicated that “ alters ” usually emerged quite abruptly with marked changes in facial expression , tone , and prosody of voice , vocabulary , and gesture ; there were also reportedly differences in handwriting , behavioral and affective expressions ; some were more playful , informal , warm or witty than the patient ’ s adult persona . An alternative is a pair of wearable " expression glasses " ( Figure 2 ) that sense changes in facial muscles , such as furrowing the brow in confusion or interest . During the evolutionary history of the lineage , changes between successive nodes may be characterised by the appearance of new characters ( apomorphies ) such as , in this case , feathers , which have been inferred to appear between two nodes . In our view , IRS could implement these changes at minimal cost , as they are basically procedural changes and modifications to existing forms and publications .