Orientation processing

Our research investigates the impact of visual stimuli precision on orientation processing in higher cortical areas. Specifically, we examined cortical area 21a in cats, often considered the equivalent of primate area V4 within the hierarchical organization of visual processing. 'MotionClouds' (MC), pseudo-natural stimuli, were used to explore orientation precision's effects on neuronal responses. MC precision is governed by four parameters: the orientation, the spatial frequency (SF), Bθ and Bsf. We analyzed responses from 411 neurons in area 21a, seeking patterns in orientation precision pro

…is observable in the domain of orientation processing as cardinal bias (repulsion from more common vertical and horizontal orientations) and serial dependance (attraction towards recent stimuli) [1,2]. These biases operate on vastly different time scales and have typically been studied in isolation. Investigating the properties of these two biases in tandem may reveal important insights into general principles of perception (efficient coding, Bayesian inference) that are obscured when studied in