Unformatted text preview: s.
• Stimulus-driven saccades in leftward
direction are impaired. A D A T K Q N
X S A U A A A E
A Z M A C C A Q B K
N B R U A G A F Z E H V A V S A I A S J A M P G A S B T W PT
1° Niemeier & Karnath (2003) 100 ms 47 What is spatial neglect?
Neglect symptoms can be significantly reduced with
• Caloric stimulation
• Perenin (1997): improving visual
imagery w/o caloric
stimulation with caloric
stimulation 48 reme right and spent most of the time
at location in space. The maximum of
ther lay `only' 158 right of the peak
controls. Spontaneous visual search
ed towards more eccentric positions on What is spatial neglect? Head-on-trunk signal in neglect patients • Neglect patients
( argue for a deviation of
¢ndingsoften) have a
ce representation underlying neglect
d space. However, they leave
ration of isturbed sense for
l gestaltstraight ahead.
of the deviated representation.
theses have been put forward (see ¢gure N ' O R ` T R A N S L AT ION ' OF
E N T R IC F R A M E ? estion has been a rotation of the whole
rence frame around the earth-vertical
ard the ipsilesional side (Ventre et al.
et al. 1993); another has been a translation
eference system towards the side of the
t al. 1995).
sh between both hypotheses, neglect
tion of subjective body orientation was
wo di¡erent distances away from the
In complete darkness, a red light-emitD) was randomly presented either on
he right side of the patient's midsagittal
he area of LED presentation ranged (b) Karnath, 1997
49 What is spatial neglect?
T R U N K O R I E N T A T I O N IN N E G L E C T Head-on-trunk signal in neglect patients 3 22 • Neglect
the trunk turns
to the left. III II LVF FP R V F y a »a 7° D x 15? m ent o f t he e gocentric m idline o f t he b ody-centered repr esentation o f v isual space 9
T hus i t c an be a ssumed t hat t he c ompensatory e ffect
o f n eck v ibration o n n eglect s ymptomatology is s pecific
i n t hat i t i nfluences t he c entral r epresentation o f
e gocentric space r ather t han b y p roducing a rousal a nd
a ctivation d ue t o u nspecific s ensory s timulation o n t he
c ontralesional side o f t he body. To f urther test this ass umption, t he p resent s tudy c ompared, a t t he...
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This note was uploaded on 04/11/2012 for the course NEURO NROC64 taught by Professor Matthias during the Winter '12 term at University of Toronto.
- Winter '12