[Eeglablist] phd position at university of aberdeen
J.Martinovic at liverpool.ac.uk
Sun Mar 21 15:52:34 PDT 2010
Interactions between bottom-up and top-down biases in the processing of
colour; a fully-funded PhD project at the School of Psychology,
University of Aberdeen
The efficiency of attentional selection depends on two factors: the
saliency of the stimulus (bottom-up processing, driven by exogenous
cues) and the adopted perceptual set (top-down processing, driven by
endogenous cues). Relations between these stimulus and task-driven
factors are still poorly understood. However, it seems that in difficult
tasks, when stimuli compete for limited perceptual resources, endogenous
cueing interacts with exogenous cues such as stimulus saliency. In
real-life situations, the visual system is habitually presented with the
difficult task of selecting stimuli from diverse and dynamic scenes.
Therefore it is reasonable to assume that interactions between bottom-up
and top-down biases are the norm, rather than an exception. Preliminary
work, using psychophysics and steady-state visual evoked potentials in
the EEG, indicates multiplicative, independent effects of saliency and
top-down selection in a continuous stimulus domain such as luminance.
The aim of this project is to look for interactions between colour
saliency and cueing in colour selection using the same methods. Due to
the discontinuous nature of colour as a stimulus dimension, there may be
interactions between bottom-up and top-down factors dependent on both
low-level and high-level colour representations. This will extend the
previous work on colour selection derived from visual search paradigms
into the domain of complex dynamic displays and will complement it with
insights into underlying neural processes through the use of EEG.
The project is based at the School of Psychology of the University of
Aberdeen and will be supervised by Dr Jasna Martinovic and Prof Arash
School of Psychology has state-of-the-art EEG facilities, including two
64-electrode Biosemi ActiveTwo EEG systems. Vision Research Laboratories
within the School are equipped with multiple psychophysical workstations
and a high-resolution eye tracking system (EyeLink 1000). The succesful
candidate will join an active group of vision researchers comprising of
academic and research staff and students.
Information for applicants
Candidates must be eligible for UK/EU fee status and should hold a First
or Upper Second Class Honours degree, a Masters degree or an equivalent
qualification. Candidates should have a background in visual
perception, neuroscience, cognitive psychology or a related field.
Programming skills (e.g. Matlab, C) and previous experience with
electrophysiology, psychophysics and signal processing methods are
If you would like to be considered for this position, please send a
cover letter, an up-to-date CV and names of two referees to Dr Jasna
Martinovic (j.martinovic at abdn.ac.uk).
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