 A review of the literature conducted by Drs.Amrisha Vaish, Tobias Grossman, and Amanda Woodward suggests the negativity bias may emerge during the second half of an infant's first year, although the authors also note that research on the negativity bias and affective information has been woefully neglected within the developmental literature.Some research indicates that older adults may display, at least in certain situations, a positivity bias or positivity effect.