Reaching to a target in the 3-D space

Bosco, Annalisa (2010) Reaching to a target in the 3-D space, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Neurofisiologia, 22 Ciclo.
Documenti full-text disponibili:
[img] Documento PDF (English) - Accesso riservato - Richiede un lettore di PDF come Xpdf o Adobe Acrobat Reader
Download (2MB)


Reaching and grasping an object is an action that can be performed in light, under visual guidance, as well as in darkness, under proprioceptive control only. Area V6A is a visuomotor area involved in the control of reaching movements. V6A, besides neurons activated by the execution of reaching movements, shows passive somatosensory and visual responses. This suggests fro V6A a multimodal capability of integrating sensory and motor-related information, We wanted to know whether this integration occurrs in reaching movements and in the present study we tested whether the visual feedback influenced the reaching activity of V6A neurons. In order to better address this question, we wanted to interpret the neural data in the light of the kinematic of reaching performance. We used an experimental paradigm that could examine V6A responses in two different visual backgrounds, light and dark. In these conditions, the monkey performed an istructed-delay reaching task moving the hand towards different target positions located in the peripersonal space. During the execution of reaching task, the visual feedback is processed in a variety of patterns of modulation, sometimes not expected. In fact, having already demonstrated in V6A reach-related discharges in absence of visual feedback, we expected two types of neural modulation: 1) the addition of light in the environment enhanced reach-related discharges recorded in the dark; 2) the light left the neural response unmodified. Unexpectedly, the results show a complex pattern of modulation that argues against a simple additive interaction between visual and motor-related signals.

Tipologia del documento
Tesi di dottorato
Bosco, Annalisa
Dottorato di ricerca
Scuola di dottorato
Scienze mediche e chirurgiche cliniche
Settore disciplinare
Settore concorsuale
Parole chiave
Neurophysiology dorsal visual stream parieto-occipital cortex
Data di discussione
21 Maggio 2010

Altri metadati

Gestione del documento: Visualizza la tesi