28 October 2004

Web searching 1.0: Public searching of the Web, by A. Spink and B.J. Jansen

The results from seven years of research on how people look for information on the web are presented in a new book by Amanda Spink and Bernard J. Jansen: Web searching: Public searching of the Web. The book is not available yet, but some reviews are.

Among the findings, Spink and Jansen observe little evolution over time in search behaviour: people do simple, rapid searches. On average they enter two words per search; inspect only the first page of results; do two queries per search session; search sessions are short, less than five minutes.

What has significantly evolved over time is the content searched. In 1997, about 20% of the search terms used was sex-related, now they account for about 5% in the US, between 8 and 10% in Europe. The opposite has happened with search terms related to e-commerce: they are 86% more frequent now than seven years ago.

Where: US (mostly)
When: 1997 - 2003

Posted at 10:59 AM in Book Reviews, Digital behaviour | Permalink | Comments (0) | TrackBack

19 October 2004

Natural-Born Cyborgs, by Andy Clark

To appear on the November 2004 issue of Interactions of the ACM

The latest book by philosopher and cognitive scientist Andy Clark is a challenging and eclectic discussion of how the relationship between biology, technology and culture construes our mind and our identity. The book is articulated around a unique central character: the cyborg, a CYBernetically controlled ORGanism.

The first cyborgs Clark introduces are organisms which have incorporated machines into their bodies, in the form of prostheses, enhanced perceptual systems, and neural implants, to recover and extend physiological functions. Examples of such cyborgs are organisms with implanted pumps that inject chemicals to provide supplementary biotechnological control loops, thus extending their capacity to adapt to exceptional environmental conditions. Cochlear implants, which electronically stimulate the auditory nerve, and more advanced implants that bypass the cochlea, directly penetrate the brain stem to extend the hearing faculty. Few of us are cyborgs in this sense.

The second cyborgs we meet are of a different kind. They are organisms surrounded by props, aids, tools, and artefacts external to their bodies, and yet completely integrated to their actions; contributing to the way information is processed and problems are solved. We are all cyborgs in this sense. In the course of our activities, we effortlessly couple with many of the technologies that are available to us, in what Andy Clark calls information processing mergers between our mental activities and the operations of artefacts, such as pen, paper, print and electronics. These technologies can be totally transparent: a technology that is so well fit to, and integrated with, our own lives, biological capacities and projects as to become almost invisible in use. We wake up in the morning at the ring of our alarm clock, PDA or mobile phone. The ring of the alarm takes on a very basic, yet critical morning task, creating a control loop for managing our daily schedule efficiently. The same happens with such mundane tools as pen and paper when we want to compute the result of a complex multiplication, when we need to remember a specific piece of information and write it down, when we plan a move and make a sketch of the way the furniture will be laid down in the new house.

Three properties of our brain make these forms of mind-machine integration possible. The brain naturally works by distributing functions among subsystems that take care of the execution of part of the action without requiring conscious control. For example, when we decide to reach for an object, posterior parietal subsystems take on control of hand orientation and finger placement to grasp the object at a subconscious level, while conscious thought can focus on something else. Similarly, if an external resource is available that can autonomously carry out part of the information-processing task, the mind will naturally outsource to it some problem-solving activity. Finally, the cortical plasticity and the protracted development and learning phases that characterize our species explain our brain’s unique capacity

to factor an open-ended set of biologically external operations and resources deep into its own basic modes of operation and functioning.

One of the pieces of research used by Clark that I think captures most vividly the depth of this integration is the transposition of the magic number seven experiment among speakers of a Cantonese dialect where number words are significantly shorter than English ones. In this linguistic context, around 20 seconds after they were presented to them as a list, participants could recall ten or more of the numbers, instead of the seven plus or minus two usually reported. During this delay, more of these shorter number words could be kept looping in the temporary buffer, expanding the overall recall capacity. The merger with external props and aids enables the biological brain to exploit its strong pattern matching and associative capacities, while augmenting its weak storage and recall of information that is externally encoded and available to perception.

Given this very strong disposition to merge with external artefacts, as new technologies become available, cyborgs are forced to evolve. What happens when the technologies let us interact with people, places, and situations at a distance? Or when the technologies give us the opportunity to control a third arm with our muscles, or to control a robot with our brain? We adapt, Clark argues, by extending and redefining our sense of body and self as a function of our experiences of direct control:

Humans are never disembodied intelligences; work in telepresence, virtual reality and telerobotics, far from bolstering any mistaken vision of detached, bodiless intelligence, simply underlines the crucial importance of touch, motion and intervention. What matters are the complex feed-back loops that connect action commands, bodily motions, environmental effects, and multiperceptual inputs. It is the two-way flow of influence between brain, body and world that matters, and on the basis of which we construct our sense of self, potential and presence.

The critical factor is not physical co-presence and direct contact. It is the feeling of directness of the experience, as produced by the combination of rich sensorial stimulation throughout and action upon the distant environment.

The book ends with a generic discussion of the personal and social implications as we merge with the latest digital communication technologies. Nine themes are analysed: inequality, intrusion, uncontrollability, overload, alienation, narrowing, deceit, degradation, and disembodiment; but, unfortunately, little of the insight and precision of the preceding discussions is brought to bear to shed new light on these issues. The main contribution is a call to factor in our hybrid biological-technological nature in our effort to make sense of ourselves and of the relations we have with the technologies around us, and an invitation to actively engage in shaping the future technological and social environments that will emerge.

Written in a very engaging, discursive style, the book addresses conceptual issue of great relevance for the Human Computer Interaction community:

It is our own natural proclivity for tool-based extension, and profound and repeated self-transformation, that explains how we humans can be so very special while at the same time being not so very different, biologically speaking, from the other animals with whom we share both the planet and most of our genes. What makes us distinctively human is our capacity to continually restructure and rebuild our own mental circuitry, courtesy of an empowering web of culture, education, technology and artefacts.

The argument that the interplay of brain and artefacts is the foundation of human identity and intelligence is richly supported by findings from philosophy of mind, cognitive psychology, and neuroscience. As usual, one would have wished for more: more about the specific types of information processes that are most elicited by the latest wave of technological innovations; more about the particular conditions that web and mobile technologies have created for augmenting the social space and about the transformation to social identity that follow; more about the active cyborg that not only merges with technologies, tools, aids, and props—but creates or contributes to the development of such artefacts.

Minds, Technologies, and the Future of Human Intelligence
By Andy Clark
229 pp.
Oxford University Press
Hardcover: April 1, 2003

Posted at 05:50 PM in Book Reviews | Permalink | Comments (0) | TrackBack


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