Tactile discrimination performance deficits following neglect-producing unilateral lateral hypothalamic lesions in the rat
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2021, Neuroscience LettersCitation Excerpt :Scoring was as follows: 0 score, the rat fell down from the beam ; 1 score, the rat was unable to move but remained seated across the beam; 2 score, the rat fell down while walking; 3 score, the rat could traverse the beam with more than 50 % foot-slips of the affected hindlimb; 4 score, the rat crossed the beam with less than 50 % foot-slips of the affected hindlimb ; 5 score, the rat crossed the beam with only one slip of the affected hindlimb; and 6 score, the rat crossed the beam with no foot slips. The elevated body swing test was used to test asymmetric motor behavior [15]. Rats held by the base of the tail were raised about 10 cm above the testing surface.
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2019, Brain and CognitionCitation Excerpt :Clinicians typically classify spatial neglect as a visual problem, and thus separate spatial from motor programs of therapy. They may also misinterpret the abnormal, asymmetric functional movements typically resulting from spatial neglect as the result of problems with visual perception, directly contrary to studies demonstrating that spatially-biased movements cause errors, and not biased perception (Hoyman, Weese, & Frommer, 1979; Valenstein, Heilman, Watson, & Van Den Abell, 1982; Watson, Miller, & Heilman, 1978), or fundamental motor processes (Deuel & Collins, 1984; Deuel, 1992). Thus, despite clear evidence that spatial neglect affects movement and balance (Shiraishi, Muraki, Ayaka Itou, & Hirayama, 2010; Ten Brink, Verwer, Biesbroek, Visser-Meily, & Nijboer, 2017), increases fall risk (Alemdaroğlu, Uçan, Topçuoğlu, & Sivas, 2012; Chen, Chen, Hreha, Goedert, & Barrett, 2015), predicts chronic problems with community mobility (Oh-Park, Hung, Chen, & Barrett, 2014) and appears to suppress paralysis recovery (Nijboer, Kollen, & Kwakkel, 2014), spatial retraining is not used in standard motor rehabilitation.
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2019, Handbook of Clinical NeurologyCitation Excerpt :A number of studies linked the disruption of ascending dopaminergic systems with spatial neglect and its recovery, based on animal models (Ungerstedt, 1976; Deuel and Collins, 1983) and the benefit of dopaminergic medication on generic measures of spatial neglect in human studies (Fleet et al., 1987; Mukand et al., 2001; Gorgoraptis et al., 2012). The ability to respond and turn in a contralesional direction is impaired by dopamine depletion (Carli et al. 1989), a movement bias that is distinct from a contralesional perception deficit in animals (Hoyman et al., 1979). Contralesional movement initiation is also delayed after striatal dopamine depletion in rats trained to react to sensory stimuli by making instrumental responses or head-orienting movements (Apicella et al., 1991).
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This research was supported by PHS grants MH 26973 and S05 RR 7031 to Gabriel P. Frommer. A shorter version of this research was presented at the Society for Neuroscience meetings, 1977 [18].