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Many topics have inspired significant amounts of neuroimaging
research in recent years, and the study of mental imagery was one
of the earliest to receive a thorough empirical investigation.
Twenty years later, the goal of understanding this pervasive but
elusive phenomenon continues to motivate a number of sustained
research programs on the part of cognitive psychologists and
neuroscientists. The issues at stake are easy to formulate, even if
the answers sometimes may be difficult to obtain: Which parts of
the human brain are active when a person generates a memory image
of an absent object? To what extent does mental imagery activate
cortical structures known to subserve perceptual visual experience?
If imagery and like-modality perception produce similar patterns of
brain activation, what sorts of theories should cognitive
scientists develop about the underlying mechanisms? How can we best
understand why people differ in their imagery abilities? These are
questions to which the contributors to the special issue
"Neuroimaging of Mental Imagery" offer answers, through seven
original studies based on the use of modern neuroimaging
techniques, primarily positron emission tomography (PET) and
functional magnetic resonance imaging (fMRI). These techniques are
used in the context of a variety of cognitive tasks involving
memory, problem solving, and other processes. Unlike most research
in psychology, much of the work reported here explicitly addresses
individual differences, which must be considered carefully in order
to provide comprehensive accounts of the results of imagery
experiments. Although these investigations were planned and carried
out independently, we find a remarkable convergence among them. And
this may be the surest sign that a field is indeed moving forward.
Many topics have inspired significant amounts of neuroimaging
research in recent years, and the study of mental imagery was one
of the earliest to receive a thorough empirical investigation.
Twenty years later, the goal of understanding this pervasive but
elusive phenomenon continues to motivate a number of sustained
research programs on the part of cognitive psychologists and
neuroscientists. The issues at stake are easy to formulate, even if
the answers sometimes may be difficult to obtain: Which parts of
the human brain are active when a person generates a memory image
of an absent object? To what extent does mental imagery activate
cortical structures known to subserve perceptual visual experience?
If imagery and like-modality perception produce similar patterns of
brain activation, what sorts of theories should cognitive
scientists develop about the underlying mechanisms? How can we best
understand why people differ in their imagery abilities? These are
questions to which the contributors to the special issue
"Neuroimaging of Mental Imagery" offer answers, through seven
original studies based on the use of modern neuroimaging
techniques, primarily positron emission tomography (PET) and
functional magnetic resonance imaging (fMRI). These techniques are
used in the context of a variety of cognitive tasks involving
memory, problem solving, and other processes. Unlike most research
in psychology, much of the work reported here explicitly addresses
individual differences, which must be considered carefully in order
to provide comprehensive accounts of the results of imagery
experiments. Although these investigations were planned and carried
out independently, we find a remarkable convergence among them. And
this may be the surest sign that a field is indeed moving forward.
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