class+8+lecture - Sensation and Perception Class VIII:...

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Sensation and Perception Class VIII: Quiroga et al. 2005 (conclusion) & Color Vision
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Authorship: First author is the person who made the biggest contribution. Last author is usually the professor who runs the laboratory. Others contributed in various ways.
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Funding Sources Conflicts of Interest
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General background problem Specific background Their new results Implications for future research
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Methods (at the end of the paper) Recorded from single neurons (single units) or small groups of neurons (multi-units) in the human medial temporal lobe. The location is in the “What” pathway for higher level visual processing. Subjects were 8 patients with severe, pharmacologically-intractable epilepsy who had electrodes implanted to look for the epileptic focus.
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Methods (at the end of the paper) Patients sat in bed and watched pictures on a laptop in 30 minute sessions while the data from the electrodes was recorded. Pictures were each presented 6 times, for one second each. The picture covered about 1.5 degrees of visual angle. About 88 pictures were shown per session. Patients had to press a button after each picture to say if it was of a human or not (to make sure they paid attention).
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Methods (at the end of the paper) When they looked at the data afterwards, they counted the action potentials (spikes) recorded from individual neurons before the picture was displayed (baseline) and after the picture was displayed. Neurons were considered to have responded to the picture if they exhibited a response rate at least 5 standard deviations above baseline.
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Summary of responses to different pictures for the neuron in Figure 1. Red indicates photos of Jennifer Aniston. The horizontal line indicates 5 standard deviations above baseline firing rate.
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An ROC (Receiver Operating Characteristic) curve showing that the neuron in Figure 1 discriminates between pictures of Jennifer Aniston
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class+8+lecture - Sensation and Perception Class VIII:...

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