September 1, 2014 at 11:34 am (Publications)
Several lines of evidence suggest that resetting your mind once in a while can have beneficial effects. Here we show how this can be so.
Neural coordination can be enhanced by occasional interruption of normal firing patterns: A self-optimizing spiking neural network model
Alexander Woodward, Tom Froese and Takashi Ikegami
The state space of a conventional Hopfield network typically exhibits many different attractors of which only a small subset satisfy constraints between neurons in a globally optimal fashion. It has recently been demonstrated that combining Hebbian learning with occasional alterations of normal neural states avoids this problem by means of self-organized enlargement of the best basins of attraction. However, so far it is not clear to what extent this process of self-optimization is also operative in real brains. Here we demonstrate that it can be transferred to more biologically plausible neural networks by implementing a self-optimizing spiking neural network model. In addition, by using this spiking neural network to emulate a Hopfield network with Hebbian learning, we attempt to make a connection between rate-based and temporal coding based neural systems. Although further work is required to make this model more realistic, it already suggests that the efficacy of the self-optimizing process is independent from the simplifying assumptions of a conventional Hopfield network. We also discuss natural and cultural processes that could be responsible for occasional alteration of neural firing patterns in actual brains.
July 25, 2014 at 11:09 am (Publications)
The journal Adaptive Behavior has published another round of short communications that were inspired by our paper on Turing patterns and altered states of consciousness. In her commentary, Helvenston raised a number of general concerns that, although somewhat unrelated to our original proposal, provided us with an opportunity to dig deeper into the literature in our response.
People in the Paleolithic could access the whole spectrum of consciousness: Response to Helvenston
Tom Froese, Alexander Woodward, and Takashi Ikegami
Three kinds of hallucinations have repeatedly been identified in the literature on altered states of consciousness (ASCs): visions of (1) geometric forms, (2) figures and objects, and (3) complete scenes. Lewis-Williams’ neuropsychological model draws on these reports to gain insights into the minds of Paleolithic people, on the basis of shared neurobiology and given comparative ethnographic data on ritualized ASCs. Helvenston has long rejected this model because in many ASCs hallucinations do not always adhere to a strict 1-2-3 sequence, because they do not always feature animals, and because people do not always lose their critical faculties. She is right, but she is attacking a straw man because these criteria are her own. Helvenston’s claims about the effects of psychoactive compounds and sensory deprivation are also questionable. It remains an open question how our Turing pattern model relates to more figurative forms of hallucinations.
July 3, 2014 at 11:40 am (Publications)
During my time as a postdoc at the Sackler Centre for Consciousness Science in Brighton I was conducting explicitation interviews to explore the experience of people with synesthesia. It was hard work to analyze the transcripts, but I’m happy that our perseverance has finally paid off.
An extended case study on the phenomenology of sequence-space synesthesia
C. Gould, T. Froese, A. B. Barrett, J. Ward and A. K. Seth
Investigation of synesthesia phenomenology in adults is needed to constrain accounts of developmental trajectories of this trait. We report an extended phenomenological investigation of sequence-space synesthesia in a single case (AB). We used the Elicitation Interview (EI) method to facilitate repeated exploration of AB’s synesthetic experience. During an EI the subject’s attention is selectively guided by the interviewer in order to reveal precise details about the experience. Detailed analysis of the resulting 9 h of interview transcripts provided a comprehensive description of AB’s synesthetic experience, including several novel observations. For example, we describe a specific spatial reference frame (a “mental room”) in which AB’s concurrents occur, and which overlays his perception of the real world (the “physical room”). AB is able to switch his attention voluntarily between this mental room and the physical room. Exemplifying the EI method, some of our observations were previously unknown even to AB. For example, AB initially reported to experience concurrents following visual presentation, yet we determined that in the majority of cases the concurrent followed an internal verbalization of the inducer, indicating an auditory component to sequence-space synesthesia. This finding is congruent with typical rehearsal of inducer sequences during development, implicating cross-modal interactions between auditory and visual systems in the genesis of this synesthetic form. To our knowledge, this paper describes the first application of an EI to synesthesia, and the first systematic longitudinal investigation of the first-person experience of synesthesia since the re-emergence of interest in this topic in the 1980’s. These descriptions move beyond rudimentary graphical or spatial representations of the synesthetic spatial form, thereby providing new targets for neurobehavioral analysis.
This paper is also available from Frontiers in Human Neuroscience.
May 14, 2014 at 3:40 pm (Publications)
Recently we submitted the final manuscript of an edited collection for publication in Palgrave Macmillan’s series New Directions in Philosophy and Cognitive Science.
Cappuccio, M. and Froese, T. (Eds.) (forthcoming). Enactive Cognition at the Edge of Sense-Making: Making Sense of Non-Sense. Basingstoke, UK: Palgrave Macmillan.
The book is scheduled to appear at the end of this year / beginning of next year. Here is the blurb:
The enactive approach is a growing movement in cognitive science that replaces the classical computer metaphor of the mind with an emphasis on biological embodiment and social interaction as the sources of our goals and concerns. Mind is viewed as an activity of making sense in embodied interaction with our world. However, if mind is essentially a concrete activity of sense-making, then how do we account for the more typically human forms of cognition, including those involving the abstract and the patently nonsensical? To address this crucial challenge this collection brings together new contributions from the sciences of the mind that draw on a wide variety of disciplines, including psychopathology, phenomenology, primatology, gender studies, quantum physics, immune biology, anthropology, philosophy of mind, and linguistics. This book is required reading for anyone who is interested in how the latest scientific insights are changing how we think about the human mind and its limits.
I’ve made the introduction to the book (including the table of contents) available here:
Cappuccio, M. and Froese, T. (forthcoming). Introduction to making sense of non-sense. In M. Cappuccio, & T. Froese (Eds.). Enactive Cognition at the Edge of Sense-Making: Making Sense of Non-Sense. Basingstoke, UK: Palgrave Macmillan.
April 22, 2014 at 12:40 pm (Publications)
I was invited to provide a commentary on Anil Seth’s Cognitive Neuroscience target article “A predictive processing theory of sensorimotor contingencies: Explaining the puzzle of perceptual presence and its absence in synesthesia“. Here it is:
Steps toward an enactive account of synesthesia
Seth extends predictive processing with counterfactuals: Encoded probabilities of what would occur given a repertoire of possible (but unexecuted) actions. He thereby provides a neat mathematical formulation of the sensorimotor account of perceptual presence, i.e., of the fact that we perceive a whole object while being limited to seeing it from a perspective. Synesthetic concurrents are explained in terms of impoverished counterfactuals. I argue that this explanation misses its target, because it only accounts for a lack of objecthood. Enactive theory is better suited to explain concurrents’ lack of subjectivity veridicality. The world itself shapes experience only during veridical perception.
April 21, 2014 at 12:21 pm (Publications)
Tags: embodied cognition, enactive cognitive science, extended cognition, philosophy of mind
I was invited to write a review of Hutto and Myin’s Radicalizing Enactivism: Basic Minds without Content for The Journal of Mind and Behavior. You can read my largely positive verdict here:
Radicalizing Enactivism: Basic Minds without Content. Daniel D. Hutto and Erik Myin. Cambridge, Massachusetts: MIT Press, 2013, 206 pages, $35.00 hardcover
Increasing numbers of philosophers of mind and cognitive scientists are jumping on the embodied cognition bandwagon. Accordingly, mind is no longer viewed as locked away in some Platonic realm of pure logic, as the computational theory of mind has traditionally proposed. Instead, mind has become identified with purposeful activity in the world, an activity that is realized by the body, extended by usage of tools, and scaffolded by a sociocultural environment.
March 11, 2014 at 12:53 pm (Publications)
More discussion of the role of neural Turing instabilities enabled by unusual disinhibitions of the primary sensory cortex. My colleagues and I respond to commentaries by two cognitive archaeologists, Hodgson and Lewis-Williams, in the latest issue of Adaptive Behavior.
Are altered states of consciousness detrimental, neutral or helpful for the origins of symbolic cognition? A response to Hodgson and Lewis-Williams
Tom Froese, Alexander Woodward and Takashi Ikegami
We respond to the commentaries by Hodgson and Lewis-Williams by clarifying the novelty of our theory. We argue that whenever Turing instabilities of neural activity play a role in generating visual hallucinations, they do more than shape the geometric patterns. Their relatively autonomous self-organization is a source of intrinsic value related to their self-maintenance as a pattern of activity, and they would also thereby decouple “higher-level” stages of neural processing from external stimulation, thus facilitating a more abstract mode of cognition. These additional features of our proposal support Hodgson and Lewis-Williams in their respective theories about the very first origins of human artistic activity. We also evaluate the critical literature regarding the possibility of ritualized enaction of altered states of consciousness (ASC) in early prehistory. We conclude that ASC were indeed possible, and suggest that they were likely involved in facilitating the social development of more symbolic forms of life and mind.
March 2, 2014 at 4:47 pm (Publications)
Tags: biology of cognition, enaction
A couple of years ago John Stewart kindly invited me to be a glossator for his latest book, Questioning Life and Cognition: Some Foundational Issues in the Paradigm of Enaction, published online by Enaction Series: Online Collaborative Publishing.
My comments are interspersed as hyperlinks throughout the book’s text, and in addition I provided an extended epilogue in which I describe John’s influence on my research outlook.
February 18, 2014 at 10:47 am (Publications)
Tags: cognitive science, enactive perception, imitation, phenomenology, primates
After 4 years of effort, my take on comparative psychology has finally been published. Many thanks to my colleague Dave for his expert guidance and endless patience.
The direct perception hypothesis: perceiving the intention of another’s action hinders its precise imitation
Tom Froese and David A. Leavens
We argue that imitation is a learning response to unintelligible actions, especially to social conventions. Various strands of evidence are converging on this conclusion, but further progress has been hampered by an outdated theory of perceptual experience. Comparative psychology continues to be premised on the doctrine that humans and non-human primates only perceive others’ physical “surface behavior,” while mental states are perceptually inaccessible. However, a growing consensus in social cognition research accepts the direct perception hypothesis: primarily we see what others aim to do; we do not infer it from their motions. Indeed, physical details are overlooked – unless the action is unintelligible. On this basis we hypothesize that apes’ propensity to copy the goal of an action, rather than its precise means, is largely dependent on its perceived intelligibility. Conversely, children copy means more often than adults and apes because, uniquely, much adult human behavior is completely unintelligible to unenculturated observers due to the pervasiveness of arbitrary social conventions, as exemplified by customs, rituals, and languages. We expect the propensity to imitate to be inversely correlated with the familiarity of cultural practices, as indexed by age and/or socio-cultural competence. The direct perception hypothesis thereby helps to parsimoniously explain the most important findings of imitation research, including children’s over-imitation and other species-typical and age-related variations.