The School of Psychology proudly presents:
The Psychonomic Seminar Series 2007
"Gnashing at statistical husks with empirical jaws to displace kernels of truth"
This Friday, at 3pm in room 304, we are very excited to presenting Dr. Greig de Zubicaray who will talk about: "Cortical mechanisms of negative priming in object naming."
Ignoring an object slows subsequent naming responses to it, a phenomenon known as identity negative priming (NP). A central issue in NP research concerns the level of representation at which the effect occurs. As object naming is typically considered to involve access to abstract semantic representations, Tipper (1985) proposed
that the identity NP effect occurred at this level of processing. Tipper and other researchers supported this proposal by demonstrating
a similar result with categorically related objects (e.g., Allport et al., 1985; Murray, 1995), an effect referred to as semantic NP. Two fMRI studies conducted in our lab demonstrate that the cortical
mechanisms responsible for these NP effects differ considerably. The results show the locus of the identity NP effect in object naming is most likely at the level of abstract semantic representations as
Tipper (1985) proposed. However, they also show this is not the case for the semantic NP effect, which is most likely a function of the structural similarity of categorically related prime-probe object pairings. Together, these studies indicate that fMRI might provide useful information about the processes engaged during the performance of cognitive tasks.
Greig is world-famous for having completed a BA, PG Dip, M Clin Psych and a PhD all here at the University of Queensland. Since 1996 he has
been gainfully employed at the Centre for Magnetic Resonance, also here at the University of Queensland (do you think he