Timing patterns of strobe groups for echolocating big brown bats performing a target detection task

2013 ◽  
Vol 134 (5) ◽  
pp. 4119-4119
Author(s):  
Laura N. Kloepper ◽  
James A. Simmons ◽  
Jason E. Gaudette ◽  
Ryan Himmelwright ◽  
Dan Robitzski
Keyword(s):  
Target Detection ◽  
Detection Task ◽  
Big Brown Bats ◽  
Target Detection Task

Visual Perception of Apparent Motion Abides by Minimization Principles of Geometry

2021 ◽  
Author(s):  
Yaxin Liu ◽  
Stella F. Lourenco
Keyword(s):  
Visual Perception ◽  
Target Detection ◽  
Apparent Motion ◽  
Visual Space ◽  
Detection Task ◽  
Newtonian Physics ◽  
Kinematic Geometry ◽  
Shed Light ◽  
Target Detection Task ◽  
Perceptual Phenomenon

Apparent motion is a robust perceptual phenomenon in which observers perceive a stimulus traversing the vacant visual space between two flashed stimuli. Although it is known that the “filling-in” of apparent motion favors the simplest and most economical path, the interpolative computations remain poorly understood. Here, we tested whether the perception of apparent motion is best characterized by Newtonian physics or kinematic geometry. Participants completed a target detection task while Pacmen- shaped objects were presented in succession to create the perception of apparent motion. We found that target detection was impaired when apparent motion, as predicted by kinematic geometry, not Newtonian physics, obstructed the target’s location. Our findings shed light on the computations employed by the visual system, suggesting specifically that the “filling-in” perception of apparent motion may be dominated by kinematic geometry, not Newtonian physics.

Effect of Feedback on Users’ Immediate Emotions: Analysis of Facial Expressions during a Simulated Target Detection Task

2019 ◽  
Author(s):  
Md Abdullah Al Fahim ◽  
Mohammad Maifi Hasan Khan ◽  
Theodore Jensen ◽  
Yusuf Albayram ◽  
Emil Coman ◽  
...  
Keyword(s):  
Facial Expressions ◽  
Target Detection ◽  
Detection Task ◽  
Target Detection Task

Activation of Monkey Locus Coeruleus Neurons Varies With Difficulty and Performance in a Target Detection Task

2004 ◽  
Vol 92 (1) ◽  
pp. 361-371 ◽  
Author(s):  
Janusz Rajkowski ◽  
Henryk Majczynski ◽  
Edwin Clayton ◽  
Gary Aston-Jones
Keyword(s):  
Locus Coeruleus ◽  
Target Detection ◽  
Response Times ◽  
Behavioral Responses ◽  
Early Response ◽  
Detection Task ◽  
Correct Rejection ◽  
Small Magnitude ◽  
Sensory Stimuli ◽  
Target Detection Task

We previously reported that noradrenergic neurons in the monkey locus coeruleus (LC) are activated selectively by target stimuli in a target detection task. Here, we varied the discrimination difficulty in this task and recorded impulse activity of LC neurons to analyze LC responses on error trials and in relation to behavioral response times (RTs). In easy and difficult discrimination conditions, LC neurons responded preferentially to target stimuli with phasic activation. These responses consistently preceded behavioral responses regardless of task difficulty. Latencies for LC and behavioral responses increased similarly for difficult compared with easy discrimination trials. LC response latencies were also shorter for fast RT trials compared with slow RT trials regardless of difficulty, indicating a close temporal relationship between LC and behavioral responses. This relationship was confirmed with response-locked histograms of LC activity, which yielded more temporally synchronized LC responses than stimulus-locked histograms. Population histograms of LC activity revealed that nontarget stimuli resulting in false alarm responses produced phasic LC activation (although smaller than for target-hit trials), and nontarget stimuli resulting in correct rejection responses yielded a small inhibition in LC activity. Population analyses also revealed that LC responses included an early, small excitatory component that was not previously detected. This early response was nondiscriminative because it was similar for target and nontarget stimulus trials. These results indicate that LC neurons exhibit early small magnitude responses that are closely linked to sensory stimuli. In addition, these cells show a later, larger magnitude response that is temporally linked to behavioral responses. These and other results lead us to hypothesize that LC responses are driven by decision processes and help facilitate subsequent behavioral responses.

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