Neuroimaging the short- and long-term effects of repeated picture naming in healthy older adults.
Repeated attempts to name pictures can improve subsequent naming for aphasic individuals with anomia, however, the neurocognitive mechanisms responsible for such improvements are unknown. This study investigated repeated picture naming in healthy older adults over a period of minutes (short-term) after one repetition and a period of days (long-term) after multiple repetitions. Compared to unprimed pictures, both repeated conditions showed faster naming latencies with the fastest latencies evident for the short-term condition. Neuroimaging results identified repetition suppression effects across three left inferior frontal gyrus regions of interest: for both the short- and long-term conditions in the pars orbitalis, and for long-term items in the pars triangularis and pars opercularis regions. The whole brain analysis also showed a repetition suppression effect in bilateral pars triangularis regions for the long-term condition. These findings within the inferior frontal gyrus suggest that effects of repeated naming may be driven by a mapping mechanism across multiple levels of representation, possibly reflecting different levels of learning, and lend support to the idea that processing may be hierarchically organised in the left inferior frontal gyrus. The whole brain analysis also revealed repetition suppression for the long-term condition within the posterior portion of bilateral inferior temporal gyri, which may reflect attenuation of integration processes within this region following the learning of task-relevant information.
['MacDonald|Anna D|AD|', 'Heath|Shiree|S|', 'McMahon|Katie L|KL|', 'Nickels|Lyndsey|L|', 'Angwin|Anthony J|AJ|', 'van Hees|Sophia|S|', 'Johnson|Kori|K|', 'Copland|David A|DA|']
D001921:Brain D001931:Brain Mapping D005260:Female D006801:Humans D008279:Magnetic Resonance Imaging D008297:Male D008875:Middle Aged D059906:Neuroimaging D010364:Pattern Recognition, Visual D021641:Recognition, Psychology D060865:Repetition Priming
Picture naming Naming Repetition suppression FMRI Priming Word production