Overall, the early studies by Lashley and his contemporaries indicate a capability of rats to use their vision to discriminate visual patterns and generalize to variations of previously learned discriminations (e.g., due to size changes of the target stimuli or addition of background clutter).
The rats learned to discriminate visual stimuli within 4 5 weeks of twice daily training.
The two primary signal detection variables of interest were sensitivity (the ability to discriminate visual signals from visual noise) and response bias (the tendency to report the presence of a signal, regardless of whether one is present).
They demonstrated that, compared with participants with Alzheimer's disease, participants with dementia with Lewy bodies had significantly reduced ability to discriminate visual "signal" from "noise," and were more prone to report the presence of a visual object when one was not present.
Blindsight patients, whose primary visual cortex is severely lesioned, exhibit preserved ability to discriminate visual stimuli presented in their blind field, yet report no visual awareness [1].
Blindsight patients, whose primary visual cortex is lesioned, exhibit preserved ability to discriminate visual stimuli presented in their "blind" field, yet report no visual awareness hereof.
C) The task for the AV group was to detect and discriminate directional motion (regardless of modality), whereas the task for the V group was to detect and discriminate visual motion.
reveal differential roles of parietal and ventral cortex in extracting and discriminating visual targets, respectively.
Deviation from zero shows bias in visual choice, thus animals are able to discriminate visual stimuli in test.
Overall, Gaffan's and Simpson's study provides compelling evidence about the capability of rats to discriminate visual objects on the base of shape differences.
