Procedure

• 1. Participants are seated in front of the screen and asked to focus on a cross in the middle of the screen. One eye is covered.
• 2. Images are flashed on the screen:

  • Each one is shown for a brief period of 0.1 second so that the eye only has time to process the image in the visual field where it is placed.
• 3. Tasks are designed to test how the right and left hemispheres respond to input from left visual field (LVF) and right visual field (RVF). And left hand and right hand.
• 4. Visual and verbal task.

  • Participants are shown one image to the LVF and a different image to the RVF.
  • They are asked to say what they see on the screen or to write what they see.
• 5. Visual material shown to one visual field only.

  • Material to right visual field only is connected to left hemisphere so should be able to say what is there (because the language centre of the brain is in the left hemisphere)
  • Material to LVF does not link to the language centre.
• 6. Visual and tactile task. Participants are also asked to select an object from below the screen to match what they see.
• 7. Dual processing tactile task (two tasks performed at the same time)

  • Two objects are placed simultaneously one in each hand and then hidden in a pile of objects.
  • Each hand is required to recognise the objects.
• 8. Everyday life, participants are interviewed about everyday effects.