1991 arnath 800 ms neglect fixation p oin t i

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Unformatted text preview: s a m e a n a t o m i c a l s ite, m echanical m uscle v ibration w ith t ranscutan eous e lectrical s timulation, w hich activates a fferent n erve fibres r ather u nselectively a nd leads t o n o k inaest hetic i llusions as seen w ith vibration 9 IV B efore D 15 KOverla p et al., 1991 arnath 800 ms •  Neglect Fixation p oin t "-"-:: : :"",",""i ', 2200 ms Stimulus symptoms improve when Ey e m ovemen t V ibration SR T neck muscles FIG . 1. test an he temporal s of targe are vibratedThe 5 differenct entralcfonditionspoindt rtemained visiblequencnethef pixation ploint andappearet don in the examination. The ixation e whe eriphera target ( ~ - , 9 9 , ' ." Materials and methods , , . . . . ' ~ / , . / ' , ' . <. ,r - " . " - x ~ # 'r " I' ~ , 2 9 ;4, ./ . "'~ . . ..~. SRT = saccadic reaction. "t.ime. The ,s.patial relation between the orientation of head and trunk midli F our n eglect p atients w ere e xamined. fD emographic a nd cis illustrated as seen from above. The trunk is represented by a rectangle, the head o the stimuli linical d ata a re g iven i n T able 1. B rain l esions w ere d ocumented b y C T = e xamination i ncluding continuous 1995 s cans a nd/or M RI. N europsychological target; X = fixation point ( FP) ; broken lines = head midline; Karnath,line = trunk midline. In o S ubjects 9 c onfrontation t esting, c opying, l ine b isection, c ancellation a nd p ic- . o .. , . 9 t , , . J; '. . ~ , ~, ~ , ~ , j, ,= , 50 What is spatial neglect? Neglect can be “cured” with prism adaptation. •  Prism adaptation (demo) •  Rossetti et al. (1998) used prisms on neglect patients. Neglect patients after prism adaptation improved – a long lasting effect! •  Neglect improvement due to somatosensory recalibration of body schema? 51 Overview ! ! ! ! ! ! ! ! Behavioral consequences of attention Selective attention and orienting Attention and eye movements Physiological effects of attention How is attention directed? Corbetta's DAN and VAN What is neglect? Body schema and awareness ! Conceptualization of body schema ! Body schema is necessary for sensorimotor functions ! Out of body ! What this has to do with consciousness. 52 Body schema: Conceptualization • Coslett et al. (20...
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