BIO 346 Lecture Notes - Lecture 21: Skull, Stapes, Synapomorphy
Document Summary
Emergence of material culture w/ increase brain size (scan regulatory sequences) - associated with social learning. Derived from other species (distinct in our lineage) Sensory systems - mediate 4 major attributes of stimulus. Kind of energy neurons are transducing: chemical molecules, light energy (wavelengths), sound, potential energy (position of limb in space - proprioception) Encoded by labeled-line code: the activity of a class of sensory neurons that sense a particular kind of energy is always interpreted in the brain as belonging to that modality. Ex: stimulate neuron that conveys touch info will experience it as touch. Location (of source of energy) - spatial distribution of sensory neurons. Ex: vision - receptive fields in the retina - corresponds with the angle at which light enters our eye. Given cone/rod has a specific visual/receptive field. Ex: touch - sensory neurons that have their dendrites (terminals) in skin.
