Search results
Results from the WOW.Com Content Network
Although not explicitly mentioned in the original research paper, this ensured that the light stimulus fell only on rod cells connected to the same nerve fibre (this is called the area of spatial summation). Wavelength – the stimulus wavelength matched the maximum sensitivity of rod cells (510 nm). Stimulus duration – 0.001 second (1 ms).
In this paradigm stimuli are presented one at a time in a fixed number of locations in the visual field. Participants are to look for and indicate if a particular stimulus is the target stimulus. The main aspect of this paradigm is that prior to every presentation of a stimulus there is a cue, indicating where the stimulus is going to be present.
Later research on short-term memory and working memory revealed that memory span is not a constant even when measured in a number of chunks. The number of chunks a human can recall immediately after presentation depends on the category of chunks used (e.g., span is around seven for digits, around six for letters, and around five for words), and even on features of the chunks within a category.
where I is the intensity or strength of the stimulus in physical units (energy, weight, pressure, mixture proportions, etc.), ψ(I) is the magnitude of the sensation evoked by the stimulus, a is an exponent that depends on the type of stimulation or sensory modality, and k is a proportionality constant that depends on the units used.
In physiology, the all-or-none law (sometimes the all-or-none principle or all-or-nothing law) is the principle that if a single nerve fibre is stimulated, it will always give a maximal response and produce an electrical impulse of a single amplitude. If the intensity or duration of the stimulus is increased, the height of the impulse will ...
Low doses are insufficient to generate a response, while high doses generate a maximal response. The steepest point of the curve corresponds with an EC 50 of 0.7 molar The dose–response relationship , or exposure–response relationship , describes the magnitude of the response of an organism , as a function of exposure (or doses ) to a ...
In the classic Oddball paradigm, the deviant stimulus typically has an occurrence probability of about 20%, while the standard stimulus has a probability of about 80%. In the classical oddball paradigm, if participants are asked to respond to a deviant stimulus, the deviant stimulus is the target stimulus at that point.
In their 1982 paper, Burke and colleagues propose that the small cell size and high surface-to-volume ratio of S motor units allows for greater metabolic activity, optimized for the "highest duty cycles" of motoneurons, while other motor unit types may be involved in "lower duty cycles." However, they state that the evidence is not conclusive ...