Blinda personers icke-verbala kommunikation : studier om kroppsspråk, icke-verbal samtalsreglering och icke-verbala uttryck

The purpose of this thesis is to deepen the understanding of grown-up blind people’s non-verbal communication, including body expressions and paralinguistic (voice) expressions. More specifically, the thesis includes the following three studies: Blind people’s different forms of body expressions, blind people’s non-verbal conversation regulation and blind people’s experience of their own non-verbal expressions. The focus has been on the blind participants’ competence and on their subjective perspectives. I have also compared congenitally and adventitiously blind in all of the studies. The approach is mainly phenomenological and the qualitative empirical phenomenological psychological method is the primary methodological source of inspiration. Fourteen blind persons (and also some sigthed persons) participated. They have no other obvious disability than the blindness and their ages vary between 18 and 54. Data in the first two studies consisted of video recordings and data in the last study consisted of interviews. The overall results can be summarized in the following three points: 1. There are (almost) only similarities between the congenitally blind and adventitiously blind persons concerning their paralinguistic expressions. 2. There are mainly similarities between the two groups with respect to the occurrences of different body expressive forms. 3. There are also some differences between the groups. For example, the congenitally blind persons seem to have a limited ability to use the body in an abstract and symbolic way and they often mentioned that they have been told that their body expressions deviate from sighted people’s norms. But the persons in both groups also struggle to see themselves as unique persons who express themselves on the basis of their conditions and their previous experiences.

Neural basis of visual deficits recovery: visual residual functions and multisensory integration.

The ability of integrating into a unified percept sensory inputs deriving from different sensory modalities, but related to the same external event, is called multisensory integration and might represent an efficient mechanism of sensory compensation when a sensory modality is damaged by a cortical lesion. This hypothesis has been discussed in the present dissertation. Experiment 1 explored the role of superior colliculus (SC) in multisensory integration, testing patients with collicular lesions, patients with subcortical lesions not involving the SC and healthy control subjects in a multisensory task. The results revealed that patients with collicular lesions, paralleling the evidence of animal studies, demonstrated a loss of multisensory enhancement, in contrast with control subjects, providing the first lesional evidence in humans of the essential role of SC in mediating audio-visual integration. Experiment 2 investigated the role of cortex in mediating multisensory integrative effects, inducing virtual lesions by inhibitory theta-burst stimulation on temporo-parietal cortex, occipital cortex and posterior parietal cortex, demonstrating that only temporo-parietal cortex was causally involved in modulating the integration of audio-visual stimuli at the same spatial location. Given the involvement of the retino-colliculo-extrastriate pathway in mediating audio-visual integration, the functional sparing of this circuit in hemianopic patients is extremely relevant in the perspective of a multisensory-based approach to the recovery of unisensory defects. Experiment 3 demonstrated the spared functional activity of this circuit in a group of hemianopic patients, revealing the presence of implicit recognition of the fearful content of unseen visual stimuli (i.e. affective blindsight), an ability mediated by the retino-colliculo-extrastriate pathway and its connections with amygdala. Finally, Experiment 4 provided evidence that a systematic audio-visual stimulation is effective in inducing long-lasting clinical improvements in patients with visual field defect and revealed that the activity of the spared retino-colliculo-extrastriate pathway is responsible of the observed clinical amelioration, as suggested by the greater improvement observed in patients with cortical lesions limited to the occipital cortex, compared to patients with lesions extending to other cortical areas, found in tasks high demanding in terms of spatial orienting. Overall, the present results indicated that multisensory integration is mediated by the retino-colliculo-extrastriate pathway and that a systematic audio-visual stimulation, activating this spared neural circuit, is able to affect orientation towards the blind field in hemianopic patients and, therefore, might constitute an effective and innovative approach for the rehabilitation of unisensory visual impairments.

Estimating persistent Betti numbers for discrete shape analysis

Persistent Topology is an innovative way of matching topology and geometry, and it proves to be an effective mathematical tool in shape analysis. In order to express its full potential for applications, it has to interface with the typical environment of Computer Science: It must be possible to deal with a finite sampling of the object of interest, and with combinatorial representations of it. Following that idea, the main result claims that it is possible to construct a relation between the persistent Betti numbers (PBNs; also called rank invariant) of a compact, Riemannian submanifold X of R^m and the ones of an approximation U of X itself, where U is generated by a ball covering centered in the points of the sampling. Moreover we can state a further result in which, this time, we relate X with a finite simplicial complex S generated, thanks to a particular construction, by the sampling points. To be more precise, strict inequalities hold only in "blind strips'', i.e narrow areas around the discontinuity sets of the PBNs of U (or S). Out of the blind strips, the values of the PBNs of the original object, of the ball covering of it, and of the simplicial complex coincide, respectively.

Neuroglobin, Cytoglobin und Myoglobin in der Blindmaus Spalax ehrenbergi: Adaptation an „unterirdische Verhältnisse“

Hypoxie ist ein Zustand des Sauerstoffmangels, hervorgerufen durch fehlende Verfügbarkeit von Sauerstoff in der Umgebung eines Organismus oder durch pathologisch bedingte unzureichende Nutzbarkeit des Sauerstoffs von Geweben. Die Sensitivität gegenüber Hypoxie variiert enorm im Tierreich zwischen verschiedenen Phyla und Spezies. Die meisten Säugetiere sind nur unzureichend an niedrige Sauerstoffkonzentrationen angepasst, wohingegen einige unterirdisch lebende Säuger sehr resistent gegen Hypoxiestress sind. Um die molekulare Basis der Hypoxietoleranz zu bestimmen, wurden in der vorliegenden Arbeit Globine untersucht, die potenziell in der Lage sind, als respiratorische Proteine zur Hypoxietoleranz von Tieren beizutragen. Dazu wurde die Expression der Globine in der hypoxieresistenten, in Israel lebenden Blindmaus Spalax ehrenbergi mit der Genexpression in der hypoxiesensitiven Ratte (Rattus norvegicus) verglichen. In der vorliegenden Arbeit wurden die erst vor wenigen Jahren entdeckten Globine Neuroglobin und Cytoglobin untersucht, deren exakte physiologische Rolle noch unklar ist, und mit Daten des viel detaillierter untersuchten Myoglobins verglichen. Beim Vergleich der Expression von Cytoglobin und Neuroglobin in Spalax versus Ratte fällt auf, dass Neuroglobin und Cytoglobin bereits unter normoxischen Bedingungen auf mRNA- und Proteinebene in der Blindmaus um einen Faktor von mindesten 2 bis 3 verstärkt exprimiert werden. Bei Myoglobin (als dem Kontrollgen mit bekannter Funktion) konnte auf mRNA-Ebene eine noch weitaus stärkere Expression in Spalax vs. Ratte gefunden werden. Das übergreifende Phänomen der verstärkten Genexpression von Globinen in Spalax kann im Sinne einer Präadaptation an das unterirdische, häufig hypoxische Leben der Blindmaus interpretiert werden. Einen weiteren Hinweis auf eine besondere, spezialisierte Funktion von Neuroglobin in Spalax geben immunhistochemische Daten, die zeigen, dass Neuroglobin im Gehirn von Spalax im Gegensatz zur Ratte nicht nur in Neuronen, sondern auch in Gliazellen exprimiert wird. Dies impliziert Änderungen des oxidativen Stoffwechsels im Nervensystem der hypoxietoleranten Spezies. Die zellulären Expressionsmuster von Cytoglobin erscheinen hingegen in beiden Säugerspezies weitgehend identisch. Es wurde der Frage nachgegangen, ob und wie experimentell induzierte Hypoxie die Genexpression der Globine verändert. Dabei zeigten sich für Neuroglobin und Cytoglobin unterschiedliche Expressionsmuster. Neuroglobin wird unter diversen Sauerstoffmangelbedingungen sowohl in der Ratte als auch in Spalax auf mRNA- und Proteinebene herunterreguliert. Ein ähnliches Regulationsverhalten wurde auch für Myoglobin beobachtet. Die verminderte Expression von Neuroglobin (und evtl. auch Myoglobin) unter Hypoxie ist mit einer gezielten Verringerung der Sauerstoff-Speicherkapazität in Abwesenheit von O2 zu erklären. Ein weiterer denkbarer Grund könnte auch die allgemeine Tendenz sein, unter Hypoxie aus Energiespargründen den Metabolismus herunter zu regulieren. Cytoglobin, das bei normalen Sauerstoffbedingungen nur im Gehirn von Spalax (nicht jedoch in Herz und Leber) ebenfalls um Faktor 2 bis 3 stärker exprimiert wird als in der Ratte, ist mit einiger Sicherheit ebenfalls von adaptivem Nutzen für die Anpassung von Spalax an niedrige Sauerstoffbedingungen, wenngleich seine Funktion unklar bleibt. Unter Hypoxie wird die Cytoglobin-mRNA sowohl in Spalax als auch in der Ratte hochreguliert. Es konnte in der vorliegenden Arbeit dargelegt werden, dass die Expression von Cygb höchstwahrscheinlich durch den Transkriptionsfaktor Hif-1 gesteuert wird, der die molekulare Hypoxieantwort vieler Tierarten zentral steuert. In der vorliegenden Arbeit wurde ebenfalls die Expression von Ngb und Cygb im Gehirn des Hausschweins (Sus scrofa) untersucht. Diese Spezies diente in der Arbeit als weiterer hypoxiesensitiver Organismus sowie als biomedizinisch relevantes Modell für eine Operation an Säuglingen mit angeborenen Herzkrankheiten. Die Versuche haben gezeigt, dass die Gabe bestimmter Medikamente wie dem Immunsuppressivum FK506 zu einer erhöhten Ngb-Konzentration auf mRNA-Ebene führen kann, was potenziell im Zusammenhang mit beobachteten protektiven Effekten der Medikamentengabe während und nach der Herzoperation steht.

Target Tracking in UWB Multistatic Radars

Detection, localization and tracking of non-collaborative objects moving inside an area is of great interest to many surveillance applications. An ultra- wideband (UWB) multistatic radar is considered as a good infrastructure for such anti-intruder systems, due to the high range resolution provided by the UWB impulse-radio and the spatial diversity achieved with a multistatic configuration. Detection of targets, which are typically human beings, is a challenging task due to reflections from unwanted objects in the area, shadowing, antenna cross-talks, low transmit power, and the blind zones arised from intrinsic peculiarities of UWB multistatic radars. Hence, we propose more effective detection, localization, as well as clutter removal techniques for these systems. However, the majority of the thesis effort is devoted to the tracking phase, which is an essential part for improving the localization accuracy, predicting the target position and filling out the missed detections. Since UWB radars are not linear Gaussian systems, the widely used tracking filters, such as the Kalman filter, are not expected to provide a satisfactory performance. Thus, we propose the Bayesian filter as an appropriate candidate for UWB radars. In particular, we develop tracking algorithms based on particle filtering, which is the most common approximation of Bayesian filtering, for both single and multiple target scenarios. Also, we propose some effective detection and tracking algorithms based on image processing tools. We evaluate the performance of our proposed approaches by numerical simulations. Moreover, we provide experimental results by channel measurements for tracking a person walking in an indoor area, with the presence of a significant clutter. We discuss the existing practical issues and address them by proposing more robust algorithms.

Line bisection in simulated homonymous hemianopia

Hemianopic patients make a systematic error in line bisection, showing a contra-lesional bias towards their blind side, which is the opposite of that in hemineglect patients. This error has been attributed variously to the visual field defect, to long-term strategic adaptation, or to independent effects of damage to extrastriate cortex. To determine if hemianopic bisection error can occur without the latter two factors, we studied line bisection in healthy subjects with simulated homonymous hemianopia using a gaze-contingent display, with different line-lengths, and with or without markers at both ends of the lines. Simulated homonymous hemianopia did induce a contra-lesional bisection error and this was associated with increased fixations towards the blind field. This error was found with end-marked lines and was greater with very long lines. In a second experiment we showed that eccentric fixation alone produces a similar bisection error and eliminates the effect of line-end markers. We conclude that a homonymous hemianopic field defect alone is sufficient to induce both a contra-lesional line bisection error and previously described alterations in fixation distribution, and does not require long-term adaptation or extrastriate damage.

Rapid adaptation of visual search in simulated hemianopia

Patients with homonymous hemianopia have altered visual search patterns, but it is unclear how rapidly this develops and whether it reflects a strategic adaptation to altered perception or plastic changes to tissue damage. To study the temporal dynamics of adaptation alone, we used a gaze-contingent display to simulate left or right hemianopia in 10 healthy individuals as they performed 25 visual search trials. Visual search was slower and less accurate in hemianopic than in full-field viewing. With full-field viewing, there were improvements in search speed, fixation density, and number of fixations over the first 9 trials, then stable performance. With hemianopic viewing, there was a rapid shift of fixation into the blind field over the first 5-7 trials, followed by continuing gradual improvements in completion time, number of fixations, and fixation density over all 25 trials. We conclude that in the first minutes after onset of hemianopia, there is a biphasic pattern of adaptation to altered perception: an early rapid qualitative change that shifts visual search into the blind side, followed by more gradual gains in the efficiency of using this new strategy, a pattern that has parallels in other studies of motor learning.

Ultrasound imaging to estimate risk of esophageal and vascular puncture after conventional stellate ganglion block

The most common techniques to perform stellate ganglion blocks (SGBs) are the blind C6 approach and the fluoroscopic-controlled paratracheal C7 approach, both after manual dislocation of the large vessels. Complications due to vascular or esophageal puncture have been reported. The goal of this ultrasound imaging study was to determine how frequently hazardous structures are located along the needle path of conventional SGB and to determine the influence of the dislocation maneuver on their position.

Real-time visualization of ultrasound-guided retrobulbar blockade: an imaging study

BACKGROUND: /st> Retrobulbar anaesthesia allows eye surgery in awake patients. Severe complications of the blind techniques are reported. Ultrasound-guided needle introduction and direct visualization of the spread of local anaesthetic may improve quality and safety of retrobulbar anaesthesia. Therefore, we developed a new ultrasound-guided technique using human cadavers. METHODS: /st> In total, 20 blocks on both sides in 10 embalmed human cadavers were performed. Using a small curved array transducer and a long-axis approach, a 22 G short bevel needle was introduced under ultrasound guidance lateral and caudal of the eyeball until the needle tip was seen 2 mm away from the optic nerve. At this point, 2 ml of contrast dye as a substitute for local anaesthetic was injected. Immediately after the injection, the spread of the contrast dye was documented by means of CT scans performed in each cadaver. RESULTS: /st> The CT scans showed the distribution of the contrast dye in the muscle cone and behind the posterior sclera in all but one case. No contrast dye was found inside the optic nerve or inside the eyeball. In one case, there could be an additional trace of contrast dye behind the orbita. CONCLUSIONS: /st> Our new ultrasound-guided technique has the potential to improve safety and efficacy of the procedure by direct visualization of the needle placement and the distribution of the injected fluid. Furthermore, the precise injection near the optic nerve could lead to a reduction of the amount of the local anaesthetic needed with fewer related complications.

Die Odyssee der Pygmäen. Eine prekäre Figur auf den neuzeitlichen Spieltischen anthropologischer Differenz

Due to the impacts of postcolonialism, social and cultural anthropology has been dealing intensively with the possibilities and limits of representing "other” human beings and their meaningful worlds. Scholars such as George Marcus, James Clifford or Clifford Geertz have discussed ways of improving anthropological methods of representation without, however, fully raising questions about the quality and validity of the objects represented and the very idea, that they could be “represented”. Thus, despite attempts to purify classical anthropological categories, substantialized presences (“Humans”, “Others”, “Pygmies” etc.), various forms of binary oppositions (us–them, culture–nature, human–animal) as well as certain epistemological modes/ logoi (representation, interpretation) have been rehearsed until today. The research aims to dissect and challenge the metaphysical outputs of the “anthropological machine” (Giorgio Agamben). I intended to solve these from their apparent familiarity as representable identities or differences in order to investigate their genealogy. In Derrida’s and Foucault’s understanding, genealogy becomes manifest mainly in the “blind spots” (Derrida) or “anomalies” (Foucault) between differences, at the borders of identities. As an analytical guideline, the research uses on one concrete metonym for the Derridean blind spot, one incorporation of a Foucauldian Other, namely pygmy narratives within early modern and 19th century imaginings. “Pygmies” have been part of both Western mythology and anthropological reflection since the antiquity and finally became “ethnographical facts” within an evolutionary anthropology in the 19th century during the European exploration of Africa. Throughout this veritable Odyssey, they were mostly precarious “category-jammers” (Timothy Beal), occupying the impossible middle grounds within (proto)anthropological classification. Thus, along with the early modern wild men, enfants sauvages or the apes of proto-primatology, the pygmies of the Homeric myth, as a catalyst for the negotiation of categories, played a decisive role in early modern and 19th century conceptions of the human. Through the precarious Pygmies, concrete socio-historical materializations of Identities (human, European), differences (human–animal etc.), as well as the accompanying logoi which vindicate these as pseudo-entities, appear evident. The research aims to read and write the history of early modern and 19th Century anthropology through one of its many classificatory constituting Others. It thus contributes to a discipline that for a long time has examined concrete systems of knowledge and the genealogy of classification in general. One might call it an “anthropologization” of anthropology.

Ultrasound-guided proximal paravertebral anaesthesia in cattle

OBJECTIVE To develop and evaluate a method for ultrasound-guidance in performing the proximal paravertebral block for flank anaesthesia in cattle through a cadaveric study, followed by clinical application. STUDY DESIGN prospective experimental cadaveric study and clinical series. ANIMALS Previously frozen lumbar sections of cows without known spinal abnormalities were used. The clinical case group comprised of ten animals for which a right flank laparotomy was indicated. METHODS Twenty cow cadavers were used to perform ultrasound-guided bilateral injections of 1.0 mL dye (1.0 mL 1% Toluidine Blue in 1% Borax) at the intervertebral foramen at the level of T13, L1 and L2 spinal nerves. Distance and depth of injection, staining of the dorsal and ventral nerve branches, and deviation from the target were evaluated. The investigator's confidence as to visualisation and expected success at staining the nerve was assessed. Ten clinical cases received the ultrasound-guided proximal paravertebral anaesthesia. Analgesic success was evaluated using a 4-grade scoring system at 10 minutes after the injection and during surgery, respectively. Categorical variables were described using frequencies and proportions. RESULTS Both dorsal and ventral branches of the spinal nerves T13, L1 or L2 were at least partially stained in 41% of injections, while in 77% of injections one of the branches was stained. Five out of ten clinical cases had a satisfactory anaesthesia. There was no significant association between confidence at injection and either staining or analgesic success. CONCLUSION Results from the cadaveric and clinical study suggest no significant improvement using ultrasound guidance to perform proximal paravertebral block in cows compared to our previous clinical experience and to references in the literature using the blind method. CLINICAL RELEVANCE Further research should be conducted to improve the ultrasound-guided technique described in this study.

Biblioteca integradora para ciegos y disminuidos visuales : Realidad y desafío

El objetivo de este trabajo ha sido el estudio de la actual situación de los servicios bibliotecarios para personas ciegas y disminuidas visuales en Argentina. Se realizó una encuesta a bibliotecas que prestan servicios a personas ciegas y disminuidas visuales de todo el país. La muestra quedó conformada por 20 bibliotecas públicas y especiales en Argentina. Se confeccionó un cuestionario de 114 preguntas basadas en estándares elaborados por American Library Association (ALA) los cuales fueron preparados y enviados vía correo electrónico. Asimismo, se llevaron a cabo visitas a 10 de estas bibliotecas con el objetivo de obtener información a través de entrevistas a sus respectivos directores así como también al personal y a los usuarios que en ese momento se encontraban presentes en el lugar. El análisis de la situación de las bibliotecas para ciegos y disminuidos visuales en Argentina revela que el 70de estas bibliotecas tienen menos de 1000 ejemplares, el 40depende de donaciones y canje y el 45carecen de tecnología especial. Además presentan severas deficiencias en sus edificios. El 35atienden menos de 100 usuarios y un 40no posee ningún tipo de registro de los usuarios. Se pudieron identificar: colecciones pequeñas, servicios limitados, procesos técnicos incompletos, estructura edilicia inadecuada, escasa tiflotecnología (tecnología especial para personas ciegas y disminuidas visuales) y falta de gestión bibliotecológica, entre otras falencias. Se considera que el presente modelo de biblioteca especial posiblemente contribuya al aislamiento y al confinamiento de la persona ciega y disminuida visual, por ello se debe tener en cuenta un nuevo modelo de biblioteca integradora basado en los Manifiestos de la Unesco para bibliotecas públicas y bibliotecas escolares. Se sugiere la aplicación de este modelo de biblioteca integradora capaz de garantizar eficazmente el acceso a la información para los ciegos y disminuidos visuales de acuerdo a las nuevas recomendaciones universales. En unas pocas palabras, una biblioteca pública para todos.

Rendición o Resistencia? : El primer discurso latino

En la segunda mitad del siglo IV a. C. Roma ocupa la Italia central y se orienta al dominio de la región meridional en colisión posible con griegos y cartagineses; su influjo se extiende incluso al Jónico cuando varias ciudades de la Magna Grecia solicitan su protección, no así Tarento, que al anclar una escuadra romana en su puerto, reaccionó atacando las naves y una guarnición romana próxima. Tarento, ante una guerra inevitable, pidió apoyo al rey Pirro de Epiro, quien vio la oportunidad de extender hacia occidente las conquistas que Alejandro dejó inconclusas; su invasión de Italia generó fuerte resistencia, pero no le impidió victorias costosas ni su avance hacia el norte; propuso por intermedio de un embajador la rendición y condiciones gravosas para los romanos que estuvieron a punto de ceder. Allí surge Appio Claudia el Ciego, anciano senador ya retirado, que con un discurso breve, preciso y muy logrado produjo un giro en las decisiones de los patricios. Analizamos el discurso conservado por Plutarco en la Vida de Pirro y lo ubicamos dentro de su contexto histórico y político; gracias a él, Roma conservó sus fronteras itálicas y preparó su futura expansión.

Biblioteca integradora para ciegos y disminuidos visuales : Realidad y desafío

El objetivo de este trabajo ha sido el estudio de la actual situación de los servicios bibliotecarios para personas ciegas y disminuidas visuales en Argentina. Se realizó una encuesta a bibliotecas que prestan servicios a personas ciegas y disminuidas visuales de todo el país. La muestra quedó conformada por 20 bibliotecas públicas y especiales en Argentina. Se confeccionó un cuestionario de 114 preguntas basadas en estándares elaborados por American Library Association (ALA) los cuales fueron preparados y enviados vía correo electrónico. Asimismo, se llevaron a cabo visitas a 10 de estas bibliotecas con el objetivo de obtener información a través de entrevistas a sus respectivos directores así como también al personal y a los usuarios que en ese momento se encontraban presentes en el lugar. El análisis de la situación de las bibliotecas para ciegos y disminuidos visuales en Argentina revela que el 70de estas bibliotecas tienen menos de 1000 ejemplares, el 40depende de donaciones y canje y el 45carecen de tecnología especial. Además presentan severas deficiencias en sus edificios. El 35atienden menos de 100 usuarios y un 40no posee ningún tipo de registro de los usuarios. Se pudieron identificar: colecciones pequeñas, servicios limitados, procesos técnicos incompletos, estructura edilicia inadecuada, escasa tiflotecnología (tecnología especial para personas ciegas y disminuidas visuales) y falta de gestión bibliotecológica, entre otras falencias. Se considera que el presente modelo de biblioteca especial posiblemente contribuya al aislamiento y al confinamiento de la persona ciega y disminuida visual, por ello se debe tener en cuenta un nuevo modelo de biblioteca integradora basado en los Manifiestos de la Unesco para bibliotecas públicas y bibliotecas escolares. Se sugiere la aplicación de este modelo de biblioteca integradora capaz de garantizar eficazmente el acceso a la información para los ciegos y disminuidos visuales de acuerdo a las nuevas recomendaciones universales. En unas pocas palabras, una biblioteca pública para todos.

Rendición o Resistencia? : El primer discurso latino

En la segunda mitad del siglo IV a. C. Roma ocupa la Italia central y se orienta al dominio de la región meridional en colisión posible con griegos y cartagineses; su influjo se extiende incluso al Jónico cuando varias ciudades de la Magna Grecia solicitan su protección, no así Tarento, que al anclar una escuadra romana en su puerto, reaccionó atacando las naves y una guarnición romana próxima. Tarento, ante una guerra inevitable, pidió apoyo al rey Pirro de Epiro, quien vio la oportunidad de extender hacia occidente las conquistas que Alejandro dejó inconclusas; su invasión de Italia generó fuerte resistencia, pero no le impidió victorias costosas ni su avance hacia el norte; propuso por intermedio de un embajador la rendición y condiciones gravosas para los romanos que estuvieron a punto de ceder. Allí surge Appio Claudia el Ciego, anciano senador ya retirado, que con un discurso breve, preciso y muy logrado produjo un giro en las decisiones de los patricios. Analizamos el discurso conservado por Plutarco en la Vida de Pirro y lo ubicamos dentro de su contexto histórico y político; gracias a él, Roma conservó sus fronteras itálicas y preparó su futura expansión.