David Bowes, R. Adams, Lola Cañamero, V. Steuber, N. Davey
{"title":"The role of lateral inhibition in the sensory processing in a simulated spiking neural controller for a robot","authors":"David Bowes, R. Adams, Lola Cañamero, V. Steuber, N. Davey","doi":"10.1109/ALIFE.2009.4937710","DOIUrl":"https://doi.org/10.1109/ALIFE.2009.4937710","url":null,"abstract":"Visual adaptation is the process that allows animals to be able to see over a wide range of light levels. This is achieved partially by lateral inhibition in the retina which compensates for low/high light levels. Neural controllers which cause robots to turn away from or towards light tend to work in a limited range of light conditions. In real environments, the light conditions can vary greatly reducing the effectiveness of the robot. Our solution for a simple Braitenberg vehicle is to add a single inhibitory neuron which laterally inhibits the output to the robot motors. This solution has additionally reduced the computational complexity of our simple neuron allowing for a greater number of neurons to be simulated with a fixed set of resources.","PeriodicalId":148607,"journal":{"name":"2009 IEEE Symposium on Artificial Life","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122046635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nicolas Oros, V. Steuber, N. Davey, Lola Cañamero, R. Adams
{"title":"Evolution of bilateral symmetry in agents controlled by spiking neural networks","authors":"Nicolas Oros, V. Steuber, N. Davey, Lola Cañamero, R. Adams","doi":"10.1109/ALIFE.2009.4937702","DOIUrl":"https://doi.org/10.1109/ALIFE.2009.4937702","url":null,"abstract":"We present in this paper three novel developmental models allowing information to be encoded in space and time, using spiking neurons placed on a 2D substrate. In two of these models, we introduce neural development that can use bilateral symmetry. We show that these models can create neural controllers for agents evolved to perform chemotaxis. Neural bilateral symmetry can be evolved and be beneficial for an agent. This work is the first, as far as we know, to present developmental models where spiking neurons are generated in space and where bilateral symmetry can be evolved and proved to be beneficial in this context.","PeriodicalId":148607,"journal":{"name":"2009 IEEE Symposium on Artificial Life","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129194243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"An artificial t cell immune system for predicting MHC-II binding peptides","authors":"C. Henneges, S. Huster, A. Zell","doi":"10.1109/ALIFE.2009.4937708","DOIUrl":"https://doi.org/10.1109/ALIFE.2009.4937708","url":null,"abstract":"One key principle of natural immune systems is the extracellular presentation of peptides bound to MHC-II complexes on the cell surface to represent the internal state. The prediction of those peptides that are presented became a current research topic in machine learning, as they may be used as potential vaccines for immunization. In addition the biological immune system (IS) is a learning system in its own right. In this work, we design an artificial immune system (AIS) that is based on observations of the natural immune system to predict MHC-II binding peptides. Our strategy simulates the mutable receptors of T lymphocytes as well as their selection during life time.We model the receptor specificity and binding mode as well as the lymphocyte's influence during an inflammatory response. Finally, our implementation uses the pathogen specificity of T cells to model the prediction problem.","PeriodicalId":148607,"journal":{"name":"2009 IEEE Symposium on Artificial Life","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117095258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Developing preferential attention to a speaker: A robot learning to recognise its carer","authors":"J. Murray, L. Cañamero","doi":"10.1109/ALIFE.2009.4937697","DOIUrl":"https://doi.org/10.1109/ALIFE.2009.4937697","url":null,"abstract":"In this paper we present a socially interactive multi-modal robotic head, ERWIN - Emotional Robot With Intelligent Networks, capable of emotion expression and interaction via speech and vision. The model presented shows how a robot can learn to attend to the voice of a specific speaker, providing a relevant emotional expressive response based on previous interactions. We show three aspects of the system; first, the learning phase, allowing the robot to learn faces and voices from interaction. Second, recognition of the learnt faces and voices, and third, the emotion expression aspect of the system. We show this from the perspective of an adult and child interacting and playing a small game, much like an infant and caregiver situation. We also discuss the importance of speaker recognition in terms of Human-Robot-Interaction and emotion, showing how the interaction process between a participant and ERWIN can allow the robot to prefer to attend to that person.","PeriodicalId":148607,"journal":{"name":"2009 IEEE Symposium on Artificial Life","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126187443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Emergence and analysis of complex food webs in an individual-based artificial ecology","authors":"Walter de Back, G. Kampis","doi":"10.1109/ALIFE.2009.4937704","DOIUrl":"https://doi.org/10.1109/ALIFE.2009.4937704","url":null,"abstract":"Food webs are complex networks of trophic interactions in ecological communities that are crucial in creating and maintaining biodiversity, and are prominent examples of biological complexity. In this paper, we present an individual-based model of an artificial ecology demonstrating the emergence of complex food webs through the evolution of rich phenotypes. Individuals are simple structures that map several traits in a nonlinear fashion. Interaction and evolution of these structures leads to the self-assembly of food webs in complex ecological communities. Ecological and network analysis of the evolved artificial ecologies shows remarkable similarities in various patterns known from natural ecological communities.","PeriodicalId":148607,"journal":{"name":"2009 IEEE Symposium on Artificial Life","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126801438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Saunders, C. Lyon, F. Förster, Chrystopher L. Nehaniv, K. Dautenhahn
{"title":"A constructivist approach to robot language learning via simulated babbling and holophrase extraction","authors":"J. Saunders, C. Lyon, F. Förster, Chrystopher L. Nehaniv, K. Dautenhahn","doi":"10.1109/ALIFE.2009.4937689","DOIUrl":"https://doi.org/10.1109/ALIFE.2009.4937689","url":null,"abstract":"It is thought that meaning may be grounded in early childhood language learning via the physical and social interaction of the infant with those around him or her, and that the capacity to use words, phrases and their meaning are acquired through shared referential ‘inference’ in pragmatic interactions. In order to create appropriate conditions for language learning by a humanoid robot, it would therefore be necessary to expose the robot to similar physical and social contexts. However in the early stages of language learning it is estimated that a 2-year-old child can be exposed to as many as 7,000 utterances per day in varied contextual situations. In this paper we report on the issues behind and the design of our currently ongoing and forthcoming experiments aimed to allow a robot to carry out language learning in a manner analogous to that in early child development and which effectively ‘short cuts’ holophrase learning. Two approaches are used: (1) simulated babbling through mechanisms which will yield basic word or holophrase structures and (2) a scenario for interaction between a human and the humanoid robot where shared ‘intentional’ referencing and the associations between physical, visual and speech modalities can be experienced by the robot. The output of these experiments, combined to yield word or holophrase structures grounded in the robot's own actions and modalities, would provide scaffolding for further proto-grammatical usage-based learning. This requires interaction with the physical and social environment involving human feedback to bootstrap developing linguistic competencies. These structures would then form the basis for further studies on language acquisition, including the emergence of negation and more complex grammar.","PeriodicalId":148607,"journal":{"name":"2009 IEEE Symposium on Artificial Life","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122725089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Distinction between types of motivations: Emergent behavior with a neural, model-based reinforcement learning system","authors":"Elshad Shirinov, Martin Volker Butz","doi":"10.1109/ALIFE.2009.4937696","DOIUrl":"https://doi.org/10.1109/ALIFE.2009.4937696","url":null,"abstract":"In this paper, we analyze the behavior of a simulated mobile robot, which interacts with an initially unknown maze-environment. The robot is controlled by an interactive system that is based on a model building Time Growing Neural Gas (TGNG) algorithm and a homeostatic motivational system, which activates movement preferences and goals within the emergent model structure for behavioral control. We propose to differentiate two types of drives (if not more), which we call location- and characteristics-based drives. We exemplary implement the two types of drives by “hunger” and “fear”, respectively. Several possible methods of combination of the two drives are investigated through simulation, identifying the combination that lead to the most suitable emergent behavior, such as emergent “wall-following” and “hiding”. Moreover, we investigate performance in an ALife-like scenario, in which the robot interacts with several food-dispensers. It is shown that additional behavioral concepts, such as “curiosity” and “inhibition of return”, can maximize the survival chances of the organism, who maintains maximal safety and keeps its belly full. In conclusion, we propose that the concept of motivation needs to be further differentiated to realize autonomous, life-like robots that are able to optimally satisfy multiple, competing types of motivations by emergent, innovative behavioral patterns.","PeriodicalId":148607,"journal":{"name":"2009 IEEE Symposium on Artificial Life","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115021572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"On the properties of artificial development and its use in evolvable hardware","authors":"Tüze Kuyucu, M. Trefzer, J. Miller, A. Tyrrell","doi":"10.1109/ALIFE.2009.4937701","DOIUrl":"https://doi.org/10.1109/ALIFE.2009.4937701","url":null,"abstract":"The design of a new biologically inspired artificial developmental system is described in this paper. In general, developmental systems converge slower and are more computationally expensive than direct evolution. However, the performance trends of development indicate that the full benefit of development will arise with larger and more complex problems that exhibit some sort of regularity in their structure: thus, the aim is to evolve larger electronic systems through the modularity allowed by development. The hope is that the proposed artificial developmental system will exhibit adaptivity and fault tolerance in the future. The cell signalling and the system of Gene Regulatory Networks present in biological organisms are modelled in our developmental system, and tailored for tackling real world problems on electronic hardware. For the first time, a Gene Regulatory Network system is successfully shown to develop the complete circuit structure of a desired digital circuit without the help of another mechanism or any problem specific structuring. Experiments are presented that show the modular behaviour of the developmental system, as well as its ability to solve non-modular circuit problems.","PeriodicalId":148607,"journal":{"name":"2009 IEEE Symposium on Artificial Life","volume":"318 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123328083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Ecological approaches to diversity maintenance in evolutionary algorithms","authors":"Sherri Goings, C. Ofria","doi":"10.1109/ALIFE.2009.4937703","DOIUrl":"https://doi.org/10.1109/ALIFE.2009.4937703","url":null,"abstract":"Evolutionary algorithms have shown great promise in evolving novel solutions to real-world problems, but the complexity of those solutions is limited, unlike the apparently open-ended evolution that occurs in the natural world. In part, nature surmounts these complexity barriers with natural ecological dynamics that generate an incredibly diverse array of raw materials for the evolutionary process to build upon, the efficacy of which has been demonstrated in the artificial life system Avida [1]. Here, we introduce a method to integrate ecological factors promoting diversity into an EA using limited resources. We show that populations evolving with this method are able to find and cover multiple niches in a simple string-matching problem, and we analyze the conditions that lead to specialists vs. generalists in this environment. These concepts lay a groundwork for building a more comprehensive ecology-based evolutionary algorithm able to achieve higher levels of complexity.","PeriodicalId":148607,"journal":{"name":"2009 IEEE Symposium on Artificial Life","volume":"1575 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127448008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"On the value of simple stoichiometry to ALife simulations using EcoSim","authors":"Matthew Conforth, Y. Meng","doi":"10.1109/ALIFE.2009.4937705","DOIUrl":"https://doi.org/10.1109/ALIFE.2009.4937705","url":null,"abstract":"Simulation software is vital to ALife research. It is known that stoichiometry is important for modeling real world ecosystems. However, most currently available ALife simulators ignore stoichiometry mechanics. Of course, not all ALife research is trying to model life as it is found on earth. In this paper, we demonstrate the value of including simple stoichiometry in ALife simulation software. Through extensive simulation results, we show that it is worthwhile even in simulators far removed from modeling real organisms on earth. Including simple stoichiometry allows agents to fill niches in a complex food web instead of all directly competing for the same resources. This increases the adaptability, survivability, robustness, and diversity of the simulated agents. Consequently the simulator is more powerful and will ultimately yield more intelligent agents.","PeriodicalId":148607,"journal":{"name":"2009 IEEE Symposium on Artificial Life","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134006878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}