John Georgakopoulos

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During short foraging excursions away from their home, central place foragers update their position relative to their point of departure by processing signals generated by locomotion. They therefore can home along a self-generated vector without using learned references. In rodents and other mammals, this path integration process (dead reckoning) can occur(More)
Golden hamsters can orient towards specific points in their environment using location- based visual cues and/or dead reckoning based on vestibular and proprioceptive signals. The relative weight of these different kinds of information was investigated in an apparatus consisting of three identical, square compartments joined by tunnels, with the subject's(More)
OBJECTIVE To evaluate the feasibility of the transperineal implementation of biocompatible balloon (Prospace) and the acute toxicity of high dose 3DCRT in patients with localized low risk prostate cancer. MATERIALS AND METHODS Between December 2011 and April 2012, fifteen patients were treated with external 3DCRT consisted of 76-78 Gy in 38-39 daily(More)
PURPOSE The purpose is to evaluate the feasibility, efficacy, and the toxicity of three-dimensional conformal radiotherapy (3DCRT) in patients with advanced hepatocelluar carcinoma (HCC) and inferior vena cava tumor thrombosis (IVCTT). METHODS Between 2007 and 2012, in a retrospective way, 9 patients (median age 69 years) with advanced HCC and IVCTT unfit(More)
AIM The aim of the present retrospective study was to evaluate the efficacy and toxicity of a hypofractionated radiotherapy (HFRT) schedule for grade IV glioblastoma multiforme (GBM). METHODS Fourteen elderly patients with KPS less than 70, received 13 fractions of 350cGy with 3D-conformal technique (3DCRT) and non-coplanar fields. Acute and late skin and(More)
BACKGROUND The aim of the study was to evaluate the efficacy, as well as the acute and late toxicity of an accelerated hypofractionated 3DCRT schedule as radical treatment in patients with organ confined glottic cancer cT1-2N0. PATIENTS AND METHODS Between June of 2004 and September 2010, 47 retrospectively selected patients (29 males, 18 females)(More)
Golden hamsters were trained to collect food in two differently patterned test boxes, linked to each other and to the nest by a T-shaped tube. To choose the correct goal direction from each box entrance the subjects could use either locomotor or visual cues. In test trials the central arm of the T-tube and the nest were rotated by 180°, setting visual and(More)
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