Mental Imagery

After many years of neglect, the topic of mental imagery has recently emerged as an active area of research in cognitive psychology. A debatable issue in this research concerns the underlying representation of images Block 1981 is an image represented as a description or as a depiction of its components Those who support the descriptive approach in the imagery debate suggest that images are not a distinct domain and thus are represented and manipulated as propositions Pylyshyn 1981 . Contrary...

Assignment of Spin Systems

HOHAHA amp COSY techniques A COSY spectrum consists of the conventional NMR signal along the diagonal and off-diagonal peaks cross peaks corresponding to 1H - 1H interactions. The peaks along the diagonal represent a normal spectrum of the system. Figure 5 is a schematic 2D plot showing the approximate positions of different types of protons along the diagonal. With few exceptions COSY cross peaks are only observed between protons separated by three or less covalent bonds and thus are...