Chapter 1. Introduction and Background
important in the area of visual word recognition is that the fovea in the eye is also precisely vertically split (Leff, in press). Thus a fixated picture is vertically divided, with the left part being sent to the right hemisphere (and the right half of the fovea) and vice-versa. In the case of reading and visual word recognition, this means that the word is divided into the two hemispheres. Everythin left of where the word is fixated is sent to the right hemisphere and everything right of the fixation point is sent to the left hemisphere. In order to be able to recognise the word and read it out aloud, it is necessary for the information in the two halves of the brain to be recombined. This is done via the Corpus Callosum. Only after the information about the word in the two hemispheres is recombined can the word be recognised.
Shillcock and Monaghan (2003) use the fact that both the fovea
and the brain are divided and integrate it into a connectionist model which they call the split-fovea model. The model is similar to the Harm and Seidenberg (1999) model
with some crucial differences.
Most notably, the input as well as the hidden layer is
split into two,
reflecting the division in the fovea and in the brain respectively.
input representing the right visual field is the left hemisphere and vice-versa. Both
connected to the hidden layer representing hidden layers are connected to each other.
very abstract model and cannot be seen as an One important difference for example is that
accurate model of in the model each
the Corpus Callosum. unit in the left hidden
a crucial part of the model since it pattern from two input patterns as
the model to compute in figure 1.8.