Complex sentence: One of his main arguments is that cognitive neuroscience's research since the late 90's have forgotten about conventional psychophysical studies based on behavioural observation and have mainly focussed on the technological advances of brain imaging techniques such as MRI and PET scans.
Split into simpler sentences: One of his main arguments is that since the late 90's, research in cognitive neurosciencehas forgotten about conventional psychophysical studies based on behavioural observation. He believes that current research focusses on the technological advances of brain imaging techniques such as MRI and PET scans.