Topic
Summation
About: Summation is a research topic. Over the lifetime, 954 publications have been published within this topic receiving 45593 citations. The topic is also known as: summation & sum of a sequence.
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01 Jan 1994
TL;DR: The responses of dorsal horn neurons to somatosensory stimulation can be altered under a variety of circumstances, including habituation following repeated stimulation of the excitatory receptive field and sensitization of primary afferent fibers.
Abstract: The responses of dorsal horn neurons to somatosensory stimulation can be altered under a variety of circumstances. For example, somatosensory responses of spinal cord dorsal horn neurons can be decreased by 1) habituation following repeated stimulation of the excitatory receptive field;46 2) stimulation of an inhibitory receptive field;30 3) activity in descending inhibitory pathways81 and 4) pathological changes leading to loss of primary afferent fibers.13 Conversely, somatosensory responses can be increased by such manipulations as 1) repeated stimulation of fine calibre primary afferent fibers (“wind-up”);47 2) spatial summation of excitatory inputs from different parts of the receptive field;49 3) volleys in excitatory pathways descending from the brain;80 and 4) sensitization of primary afferent fibers37 or of dorsal horn neurons as a consequence of damage to peripheral tissue or peripheral nerves.19,57
2 citations
Journal Article•
2 citations
Journal Article•
2 citations
01 Sep 2007
TL;DR: Attentional effects on temporal resolution may be attributed to temporal summation rather than parvocellular inhibition of magnocellular activity, and this hypothesis was examined by manipulating the luminance polarity of the stimuli against a background.
Abstract: Transient attention impairs observers’temporal resolution in a cued location. This detrimental effect of attention was ascribed to inhibitory connections from parvocellular to magnocellular neurons (1). Alternatively, the difficulty might arise because attention facilitates the temporal summation of two successive stimuli. The current study examined this hypothesis by manipulating the luminance polarity of the stimuli against a background. Attention should not modulate temporal summation of two anti-polar stimuli because these are processed in separate channels. Indeed, observers judged the temporal order of two successive stimuli better in the cued location than in the uncued location when the stimuli were opposite in polarity, but temporal resolution was worse in the cued location when the stimuli had the same polarity. Thus, attentional effects on temporal resolution may be attributed to temporal summation rather than parvocellular inhibition of magnocellular activity.
2 citations