# Similar philosophies

Most of the ideas explored in these pages are 'old hat' in one way or another and most of the original sources are not (yet) referenced here. A target article by O'Regan and Noë (2001)[1] is a good place to start the discussion of a related framework for thinking about vision. O&N's article contained many ideas that are similar to those explored in these pages and it stimulated a lively debate.

There are, however, some important points where O&N's ideas appear to differ from those explored in these pages. One issue concerns the reliance of the brain on the world as an 'outside memory' and the importance of the world as a necessary 'partner' in a 'dance' (p966). O&N say that 'contemplative seeing' is possible (without movement) and even visual imagery in dreams, but that these rely on the brain storing sensori-motor contingencies. In these pages, the issue of virtual movement has been flagged as one that appears to cause some tricky problems. I think these are problems which O&N do not really solve. It is difficult to have it both ways. O&N emphasise the idea that the world acts as an outside memory, with all the reduction in computation and storage that that entails, but what then happens in the cases where the world is removed from the equation? This needs to be made really explicit.

I (AG) agree with O&N when they deny that perception involves constructing a representation, where by 'representation' they mean something like a Cartesian reconstruction of the world. But a store of sensori-motor contingencies is a representation, albeit of a different sort, and at times O&N admit this. In the ideas set out in these pages, $\mathbf{W}$, is a representation of sensory+motivational contexts and contingencies. (If Maths notation does not display correctly try refreshing the page).

Finally, I want to disagree with some of the things O&N say about neural activity:

"There can therefore be no one-to-one correspondence between visual experience and neural activations. Seeing is not constituted by activation of neural representations. Exactly the same neural state can underlie different experiences, just as the same body position can be part of different dances." (p966)

Taken at face value, this is hard to square with the view O&N express about visual imagery (where the world is not involved) since in this case the only thing changing is neural activation. Even for an observer interacting with the world, the only important thing changing, as far as explaining perception goes, is neural activation. See Discussion

Nevertheless, O&N's emphasis on interaction with the world, and in the case of visual imagery, a sequence of sensori-motor contingencies that have been previously learned in the world, is very close to the ideas discussed here about a sensory+motivational context, $\vec{c}$, moving along paths through sensory+motivational space. In general, there is a considerable overlap between their hypothesis and the one set out in these pages.

## References

1. O'Regan, J. K., & Noë, A. (2001). A sensorimotor account of vision and visual consciousness. Behavioral and Brain Sciences, 24(05), 939-973.