Baseline Evaluation

 The baseline evaluation included a review of

 neurological records along with a neuropsychological and

 psychophysiological screening. All patients' neurological

 records were reviewed by a neurologist prior to acceptance

 into the study. All patients psychophysiological responses

 to a series of 60db tones was assessed. The

 psychophysiological screening is described more fully in the

 procedure section for experiment 1. The neuropsychological

 screening is described below.

 All patients were administered the Information and

Similarities subtests of the Wechsler Adult Intelligence

Scale-Revised (WAIS-R), Wechsler Memory Scale-Revised

(Orientation, Digit Span, Logical Stories I,II and Visual

Reproductions I, II subtests), Benton Facial Recognition

Test, Western Aphasia Battery (Spontaneous Speech, Auditory

Comprehension, Repetition, and Naming subtests), Florida

Neglect Battery (shortened version including line bisection,

cancellation, visual extinction, tactile extinction, and

draw/copy a clock). The average performance on these

measures by group is presented in Table B-7. Individual

subjects' performance on these measures are presented in

Tables B-8, B-9, B-10, and B-ll in Appendix B.

 T-tests were conducted to examine group differences in

neuropsychological functioning. Examination of the WAIS-R

subtests revealed that the LHD subjects had signicantly