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Retrograde tracing in marmoset monkeys reveals that feedback projections to V1 from extrastriate areas are disproportionately concentrated in the central visual field, while feedforward projections from the thalamus are more evenly distributed across eccentricity. This anatomical finding provides strong evidence for the Central-Peripheral Dichotomy theory, suggesting distinct computational roles for central (recognition) and peripheral (attentional selection) visual processing. The study quantifies this bias, showing a significant decrease in extrastriate feedback as a function of visual field eccentricity.
Primate V1 feedback is overwhelmingly biased towards the central visual field, challenging models that assume uniform cortical connectivity.
Retrograde tracer injections in marmoset monkeys revealed a striking feature of neural circuitry in primate visual system: among neurons projecting to the primary visual cortex (striate cortex, V1), the proportion of extrastriate feedback neurons relative to thalamic feedforward neurons decreases markedly with visual field eccentricity. This supports the Central-Peripheral Dichotomy theory, which proposes fundamentally distinct computational specializations --- visual recognition and attentional selection, respectively --- in the central and peripheral visual fields.