PSYB51H3 Lecture Notes - Lecture 3: Independent Component Analysis, Johannes Gutenberg, Sine Wave
Document Summary
And related visual illusions: what is visual acuity? (vision is discrete. , the primary visual pathway, functional properties of the striate cortex (tuning function, retinotopy, cortical column, de cits of spatial vision. An independent component analysis of the visual world. Gratings and their characteristics (lines put together = gratings) Biological relevance: natural images have certain statistical properties, the visual system is plastic (evolution&learning, we should expect: A certain specialization of the visual system for gratings and spatial frequencies. Filters specialized for edges and lines of various orientations: rectangular grating, sine wave(sinusoidal)grating, gabors (bulls eye with fuzzy edges - used bc they work better with visual cells) Sine wave gratings & gabors as building blocks of vision (& audition) Three characteristics of gratings: frequency, cycles per second = hz, cycles per visual degree = cpd amplitude. Spatial frequency: the number of cycles of a grating per unit of visual angle (usually speci ed in degrees)
