Increasing the benefits of eye-tracking devices in divided visual field studies of cerebral asymmetry

A nide range of methods has been proposed for ensuring central fixation in divided visual field studies of cerebral asymmetry. We present some of the problems associated with ensuring central fixation and argue that objective ly monitoring fixation location with an eye-tracking device can provide the only accurate and, therefore, acceptable technique. However, the mere use of this equipment does not overcome all of the problems associated with con trolling fixation location, and previous studies have overlooked the import ance of providing feedback on fixation accuracy and the role of visual atte ntion. We propose a straightforward method of accommodating both these infl uences in studies using eye-tracking devices to control fixation location.