Human primary visual cortex topography imaged via positron tomography

Invariant Nonlinear Correlations via Fourier Transform

“…Some studies have been done confirming the invariance to position, scale and rotation in the visual cortex in primates and humans (Schwartz, 1977(Schwartz, , 1980(Schwartz, , 1984 through a logarithmic polar mapping from the retina to the visual cortex as is known in the optical and digital pattern recognition. In this last aspect, for the majority of the digital systems the process is very different to the sensorial visual system, because to its natural complexity composition.…”

Comparative analysis between different font types and letter styles using a nonlinear invariant digital correlation

“…PCE / 1=RT. We based this consideration on the investigations realized in the retino-cortical mapping in humans [8] and specifically in connection with Gestalt psychology, because the studies realized in humans have to do with the log polar mapping in the visual cortex, which is a prerequisite for obtaining invariant optical and digital pattern recognition. This means dealing with perceptions that are Gestalten phenomena rather with sensations.…”

“…At the same time, some studies in optical pattern recognition [7], showed that the rotation and size-invariant properties of the cortical map were essential to any cross-correlation basis for stereopsis [5]. Some years later a direct visual cortex mapping in humans was realized using positron tomography [8]. We can say that these studies were crucial for new developments in the field of pattern recognition systems such as optical, digital and hybrid systems.…”

From Neuron to Gestalt: Mechanisms of Visual Perception

“…Studies using positron emission tomography (PET) [106,299) and magnetic resonance imaging (MRI) are needed to substantiate these startling, yet plausible claims (387). This plasticity has its parallel in animal studies.…”