On the Processing of "Extinguished" Stimuli in Unilateral Visual Neglect: An Approach Using Negative Priming

Luis J. Fuentes
1996 Cognitive Neuropsychology  
U niversity o f B irm in gh a m , B irm ing h a m , U K W e re p o rt e xp er im en t s e xa m in in g t h e p r o c ess in g o f"ex tin g u is h e d ' ' s tim u li in a p a t ien t sh o w in g v isu a l ex tin ct io n to d o u b le s im u ltan eo u s s tim u lat io n . T h e e xp er im e n t s u se d a m a t ch in g p a r a d ig m , d es ig n e d s o t h a t e xt in g u ish ed st im u li c an n o t b e n e ® t f ro m p rim in g fro m n o n -e xt in gu ish ed s tim u li p re se n t ed s im u
more » ... n eo u sly . T h e ta s k in v o lve d m a tch in g fo r p h y si ca l id en tity c en tr al t a r g e ts in p ri m e a n d p r o b e d isp lay s,¯an k ed b y d ist ra cto rs . O n"d iOEer en t' ' t ria ls, d is tra ct o r s in p rim es co u ld r e-ap p e a r a s t ar ge ts in p ro b e d isp lay s (t h e ig n o r ed r ep e titio n co n d itio n ) . E x p e rim en ts 1 an d 3 u se d n o rm a l su b je ct s an d e sta b lish ed n eg a t iv e p rim in g in t h e ig n o r ed re p et itio n co n d itio n . N eg a tiv e p rim in g o ccu rr ed b o t h w h en sti m u li in th e p r im e a n d th e p r o b e d is p la y s w e re t h e s am e ca se an d w h en t h e y d iOEe re d in c as e. E xp er im en t 2 u se d a p a tie n t m a n ifes tin g le ft -® eld n e glect . L ik e co n t ro l su b je ct s, h e sh o w e d n eg a tiv e p rim in g f ro m r igh t-® eld d is tr ac to rs . In c o n t ra st, h o w ev er, h e s h o w ed p o si tiv e p rim in g f ro m le ft -® eld d istr ac to rs . P o sit iv e p rim in g a lso o c cu rre d w h en d is tr ac to rs an d t a r g e ts d iOEer ed in ca se ( E x p er im e n t 2 b ) . E x p e rim en t 4 s h o w ed t h a t th e p a tie n t s h o w ed m ar k e d left -® eld e x t in c tio n u n d er co n d itio n s eq u iv a len t t o th o se u s ed in t h e m a tc h in g t as k . T h e d a t a in d ic a t e b o th th at"ex tin gu is h e d ' ' st im u li c an b e p ro ce sse d to a ctiv a te in te rn a l r ep re s en ta tio n s a n d th at in h ib ito ry p r o c es se s m a y n o t b e a p p lie d u n les s c o n sc io u s a t ten tio n is in v o lv ed . 1 9 96 P syc h o lo gy P res s, an im p rin t o f E rlb au m (U K ) T a ylo r & F ra n cis L t d R eq u e sts fo r rep rin ts sh o u ld b e ad d res sed to L u is J. F u en tes, D ep ar ta m en t o d e P sico lo g õ a E x p e rim en t al, F ac u lta d d e H u m a n id a d es y C C E E , U n iv er sid a d d e A lm er õ a , A lm e rõ a 0 4 12 0 , S p a in (em ail: lfu e n te s@ u a lm .es). P a rt o f th is re sea rch w a s ca rried o u t w h ile th e ® rst a u th o r w a s o n sab b a tica l lea ve in t h e C o gn itive S c ien ce R es e ar c h C e n tre, U n ive rsity o f B irm in g ha m , a n d it w as su p p o rted b y g ran ts 9 2 -27 0 a n d P B 93 -07 2 9 fro m M in isterio d e E d u c ac io n y C ien cia , D irec cio n G en er a l d e In v e stig a cio n C ie n tõ ® c a T e cn ica (D G IC Y T ). T h is w o rk w a s a lso su p p o rted b y g ran ts fro m t h e M e d ic al R es e ar c h C o u n c il o f G rea t B rita in a n d H u m an S c ien ce F ro n tie r to th e sec o n d a u th o r. S p e cia l th a n k s ar e giv en to D W fo r h is c o llab o ra tio n . W e als o w an t to th a n k C a rlo U m ilta , M a rlen e B eh rm an n , a n d a n an o n y m o u s re vie w er fo r h elp fu l co m m e n ts d u rin g th e d e ve lo p m en t o f th is ar tic le.
doi:10.1080/026432996382088 pmid:28532316 fatcat:5y6bvlb2gzh6hbtvlpnthjzmeq