Prestimulus EEG parameters during recognition of a significant photic stimulus

1987 ◽  
Vol 17 (3) ◽  
pp. 230-235 ◽  
Author(s):  
L. A. Potulova ◽  
A. V. Korinevskii
Keyword(s):  
Photic Stimulus

Changes in amplitude of the EEG induced by a photic stimulus

1976 ◽  
Vol 40 (1) ◽  
pp. 78-88 ◽  
Author(s):  
Tokuji Nogawa ◽  
Katsuyuki Katayama ◽  
Yoshito Tabata ◽  
Tatsuichiro Ohshio ◽  
Takuji Kawahara
Keyword(s):  
Photic Stimulus

Modulation of Hydra attenuata rhythmic activity: phase response curve

1976 ◽  
Vol 65 (3) ◽  
pp. 737-751
Author(s):  
C. Taddei-Ferretti ◽  
L. Cordella
Keyword(s):  
Response Curve ◽  
Phase Response Curve ◽  
Rhythmic Activity ◽  
Light Stimulation ◽  
Pulse Trains ◽  
Activity Phase ◽  
Photic Stimulus ◽  
Different Types ◽  
Hydra Attenuata ◽  
Stimulation Of

We investigated the effect of photic stimulation on the frequency of Hydra attenuata column contractions. We used positive or negative abrupt light transitions, single or repetitive light or darkness pulses, and alternation of light and darkness periods. The main results are: (a) The frequency of the contraction pulse trains (CPTs) varies transiently in response to an abrupt variation of the light intensity. (b) CPTs in progress can be inhibited by different types of photic stimuli. (c) The response time to a single photic stimulus varies during the inter-CPT interval and depends also on the polarity of the stimulus. (d) The CPTs are entrainable with repetitive light stimulation of various frequencies. (e) Long-lasting variations of the frequency of CPTs occur after the end of a repetitive light stimulation. We suggest that the mechanism responsible for the rhythym of column contractions is quite similar to that on which other biological rhythmic phenomena are based.

Electrical potentials from the eye and optic nerve of Strombus: effects of electrical stimulation of the optic nerve

1977 ◽  
Vol 66 (1) ◽  
pp. 159-171
Author(s):  
H. L. Gillary
Keyword(s):  
Electrical Stimulation ◽  
Optic Nerve ◽  
Synaptic Input ◽  
Oscillatory Potentials ◽  
Photic Stimulation ◽  
Abrupt Decrease ◽  
Electrical Potentials ◽  
Photic Stimulus ◽  
Inhibitory Synaptic Input ◽  
Stimulation Of

1. Photic stimulation of the mature eye of Strombus can evoke in the optic nerve ‘on’ activity in numerous small afferent fibres and repetitive ‘off’ bursts of afferent impulses in a smaller number of larger fibres. 2. Synchronous invasion of the eye by electrically evoked impulses in small optic nerve fibres (apparently the ‘on’ afferents, antidromically activated) can evoke a burst of impulses in the larger ‘off’ fibres which propagate away from the eye. Invasion of the eye via one branch of optic nerve can evoke an answering burst in another branch. 3. Such electrically evoked bursts are similar to light-evoked ‘off’ bursts with respect to their impulse composition, their ability to be inhibited by illumination of the eye, and their susceptibility to MgCl2 anaesthesia. 4. Invasion of the eye by a train of repetitive electrically evoked impulses in the absence of photic stimulation can give rise to repetitive ‘off’ bursts as well as concomitant oscillatory potentials in the eye which are similar to those normally evoked by cessation of a photic stimulus. 5. The electrically evoked ‘off’ bursts appear to be caused by an excitatory rebound following the cessation of inhibitory synaptic input from photoreceptors which can be antidromically activated by electrical stimulation of the optic nerve. 6. The experimental results suggest that the rhythmic discharge of the ‘off’ fibres evoked by the cessation of a photic stimulus is mediated by the abrupt decrease of inhibitory synaptic input from the receptors.

Enhancement of REM sleep during extraocular light exposure in humans

2001 ◽  
Vol 280 (6) ◽  
pp. R1606-R1612 ◽  
Author(s):  
Patricia J. Murphy ◽  
Scott S. Campbell
Keyword(s):  
Rem Sleep ◽  
Stimulus Condition ◽  
Light Exposure ◽  
Human Subjects ◽  
Sensory Modality ◽  
Sensory Stimulation ◽  
Sleep Stages ◽  
Human Central Nervous System ◽  
Exposure Interval ◽  
Photic Stimulus

This study examined the effects on sleep of light administered to an extraocular site. A 3-h photic stimulus was applied to the popliteal region during sleep in 14 human subjects. Each subject also underwent a control stimulus condition during a separate laboratory session. The proportion of rapid eye movement (REM) sleep during the 3-h light administration session increased by an average of 31% relative to the control condition. The frequency but not the duration of REM episodes was altered during light exposure, thereby shortening the REM/non-REM (NREM) cycle length. No other sleep stages were significantly affected during light administration nor was sleep architecture altered after the light-exposure interval. These results confirm that extraocular light is transduced into a signal that is received and processed by the human central nervous system. In addition, they expand to a novel sensory modality previous findings that REM sleep can be enhanced by sensory stimulation.

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