Age-related declines in neural selectivity manifest differentially during encoding and recognition

One important factor contributing to age-related memory decline is the loss of distinctiveness with which information is represented in brain activity. This loss in neural selectivity may be driven by neural attenuation (i.e., reduced activation to target stimuli) or neural broadening (i.e., increased activation to non-target stimuli). In this fMRI study, we assessed age differences in neural selectivity during first encoding, repeated encoding, and recognition, as well as the underlying pattern (broadening versus attenuation). We found lower neural selectivity in older compared to younger adults during all memory stages. Crucially, while reduced selectivity in older adults was due to neural broadening during first encoding, it was driven by neural attenuation during recognition, but revealed no clear pattern during repeated encoding. Our findings suggest that intrinsic differences between memory stages may interact with neural activity to manifest as either neural broadening or attenuation. Moreover, despite these differential patterns, neural selectivity was highly correlated across memory stages, indicating that one common mechanism may underly distinct expressions of age-related neural dedifferentiation.

Model of information process for neuromagic

In this work, I structure the magical knowledge around the neuroscientific literature. For that, I present a theoretical neuropsychological model to illustrate how magic tricks can interfere with different processes of the information flow. This model combines different memory stages, the perceptual pathway, the emergence of attention and the consciousness threshold to provide a holistic picture of how magic functions from the neuroscientific perspective. Following the model, I also present a misdirection definition and classification that is more accurate with the biological reality than the existing ones.