The work of Michael Corballis constitutes one of the most influential and integrative bodies of scholarship in contemporary cognitive neuroscience, particularly in the domains of mental time travel, language evolution, and cerebral asymmetry. Across his books and papers, Corballis develops a unified evolutionary account of the human mind, arguing that core cognitive abilities such as language, imagination, and planning are deeply rooted in brain lateralization and pre-existing neural systems originally evolved for action, gesture, and episodic memory.
At the centre of Corballis’s theoretical framework lies the concept of “mental time travel,” developed in collaboration with Thomas Suddendorf. Mental time travel refers to the uniquely human capacity to mentally reconstruct past experiences and to simulate possible future events. In their seminal work (1997; 2007), Corballis and Suddendorf argue that this ability is not merely a cognitive luxury but a foundational mechanism underlying human foresight, decision-making, and cultural complexity. They propose that the same neural systems that allow recollection of episodic memory also enable prospective simulation, suggesting a shared evolutionary architecture for remembering and imagining. This capacity, they contend, distinguishes humans from non-human animals, although they acknowledge partial precursors in other species.
Building on this, Corballis extends the idea of simulation into broader theories of cognition and language. In The Recursive Mind (2014), he argues that recursion, the ability to embed thoughts within thoughts, is the defining feature of human cognition. Recursive thinking enables not only complex language structures but also abstract reasoning, self-reflection, and cultural sophistication. For Corballis, recursion is intimately linked to mental time travel: the ability to “travel” mentally through time requires the embedding of one representational state within another, such as imagining oneself imagining a future scenario.
A second major pillar of Corballis’s work concerns the evolutionary origins of language. In From Hand to Mouth (2002) and related articles, he proposes that language did not originate as a vocal system but rather evolved from manual gestures. According to this gestural origin hypothesis, early hominins used intentional hand movements for communication, which gradually became integrated with vocalizations, eventually leading to fully articulated speech. Corballis supports this claim by pointing to neuropsychological evidence linking language areas in the brain with motor and gesture systems, as well as developmental and comparative data showing that gesture remains deeply embedded in human communication today. In this view, speech is not a replacement of gesture but its evolutionary extension.
Closely connected to this is his extensive research on brain asymmetry and lateralization. In works such as The Lopsided Ape (1991) and Human Laterality (2012), Corballis argues that the human brain is fundamentally asymmetrical, with the left hemisphere typically specialized for language and sequential processing, and the right hemisphere more involved in spatial and holistic processing. He suggests that this asymmetry is not arbitrary but has deep evolutionary roots linked to the development of handedness, tool use, and communicative gesture. The dominance of right-handedness in humans, for instance, reflects left-hemisphere specialization that later became co-opted for language functions.
Corballis further challenges simplistic “left brain/right brain” popularizations, emphasizing that lateralization is nuanced, dynamic, and functionally integrated rather than strictly divided. His work stresses that both hemispheres cooperate in most cognitive tasks, though they contribute differently depending on context and processing demands. This balanced view has been influential in correcting widespread misconceptions in both academic and popular psychology.
Across his research program, Corballis consistently argues for continuity between action, cognition, and language. Gesture, motor planning, memory, and imagination are not separate faculties but evolutionary layers of a unified cognitive system. He also situates human cognition within a broader comparative framework, exploring evidence for proto-forms of mental time travel and communication in non-human animals, while maintaining that the full recursive and generative capacity of the human mind is unique.
Corballis’s contribution lies in constructing a coherent evolutionary narrative of the human mind grounded in brain asymmetry, embodied action, and recursive simulation. His work bridges neuroscience, psychology, linguistics, and evolutionary theory, offering a deeply integrative model in which language, thought, and imagination emerge from common neural and evolutionary foundations.
