PSY 113 Lecture Notes - Lecture 7: Optic Chiasm, Absolute Threshold, Stimulus Modality
Document Summary
Roger sperry (1960"s) learning in cats, a go/no-go procedure) Interested in transfer of information from one hemisphere to the other (visual. Corpus callosum- between left and right hemisphere. We cannot cut optic chiasma in humans! Ablation/lesioning- damaging brain tissue and seeing recovery and behavior changes. Single-cell recording- a microelectrode on single cell to look at behavior. Gross potentials- researcher is looking at the activity of brain cells, not invasive". Fmri, pet scans(records on-going activity) cat scans, mri - non-invasive (records static. The minimum magnitude of stimulus that can be detected 50% of the time. The minimum amount of stimulus must change in order for the change in. Difference threshold: sensation to be detected 50% of the time the jnd= just noticeable difference. The amount of stimulation necessary to result in a just noticeable difference is a constant fraction of the stimulus intensity. Ex: for weight: k=1/50 (the weber fraction) The weber fraction varies with sensory modality.
