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This book surveys philosophical issues raised by the situated movement in cognitive science—the treatment of cognitive phenomena as the joint product of brain, body, and environment. The book focuses specifically on the hypothesis of extended cognition, according to which human cognitive processes literally comprise elements beyond the boundary of the human organism. A systems-based approach is held to provide the only plausible criterion distinguishing what is cognitive from what is not. In most human cases, this system appears within the boundary of the human organism. It is argued that the systems-based view explains the existing successes of cognitive psychology and cognate fields in a way that extended conceptions of cognition do not and, furthermore, that once the systems-based view has been adopted, it is especially clear how extant arguments in support of the extended view go wrong. Additional aspects of the situated program, including the embedded and embodied views, are also examined. The book considers whether plausible incarnations of such views depart from orthodox, computational cognitive science, especially with regard to the role of representation and computation. It is argued that the embedded and embodied views do not constitute radical shifts in perspective. For instance, properly understood, the embodied view does not offer a new role for the nonneural body, different in principle from the one presupposed by orthodox cognitive science.

The possibility of group minds or group mental states has been considered by a number of authors addressing issues in social epistemology and related areas (Goldman 2004, Pettit 2003, Gilbert 2004, Hutchins 1995). An appeal to group minds might, in the end, do indispensable explanatory work in the social or cognitive sciences. I am skeptical, though, and this essay lays out some of the reasons for my skepticism. The concerns raised herein constitute challenges to the advocates of group minds (or group mental states), challenges that might be overcome as theoretical and empirical work proceeds. Nevertheless, these hurdles are, I think, genuine and substantive, so much so that my tentative conclusion will not be optimistic. If a group mind is supposed to be a single mental system having two or more minds as proper parts, the prospects for group minds seem dim–or so I will argue.

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Goldfish acclimated to 3 and 23 °C were characterized by two- and three-component hemoglobin systems, respectively. After acclimation to a diurnally cycling temperature regime (~3 to ~23 °C), specimens sampled at ~23 °C and ~3 °C were identical in terms of hemoglobin system complexity with those held at equivalent constant temperatures. Abrupt transfer of fish acclimated at constant 23 °C to 3 °C, and vice versa, lead to appearance or disappearance of the minor component, G.1, within 3 h. In vitro cooling and warming of whole blood and hemolyzate samples indicated that hemoglobin system modification occurred under cell-free as well as cell-intact conditions. These observations suggest that previously observed quantitative variations in the hemoglobin systems of thermally acclimated teleosts may represent, in part at least, altered aggregation of preexisting subunits rather than de novo hemoglobin synthesis and raise the possibility that teleostean hemoglobin systems may possess a capacity for rapid, adaptative reorganization after environmental temperature variation.