A place for the STS in tactile processing pathways?

either expected or unexpected, interaction between sensory modalities and the functional integration of a number of systems is essential. It is perhaps only at the level of the STS that this integration is completed such that the dimension of expected/unexpected tactile

stimulation can be coded at the cellular level.

This suggests that the STS might function in somatosensory processing at a different level to that of the posterior parietal cortex or the insular cortex, the last cortical stages in the proposed tactile processing pathways (Murray and Mishkin, 1984; Murray et al, 1980). Physiological evidence concerning the increase in receptive field size posteriorly from SI to area 5 to area 7, and from SI to SII to insular cortex, corroborates this view; the present study having revealed that the receptive fields of cells in the STS are larger than those of area 7 or insular cells, including the entire body. It could be proposed therefore that the STS fits into both the tactile pathways as a high order cortical processing stage; and functions in channeling somatosensory information to the limbic structures either subsequent to or in parallel with the insular and parietal routes.

4.5 References

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CHAPTER 5

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■a

à Behavioural investigations into the importance of facial and body I attributes, and motion, on social communication in macaque monkeys. I

I

5.1 Introduction