• A
  • A
  • A
  • ABC
  • ABC
  • ABC
  • А
  • А
  • А
  • А
  • А
Regular version of the site

Student
Title
Supervisor
Faculty
Educational Programme
Final Grade
Year of Graduation
Roman Vakhrushev
Ensemble Perception Under Rapid Serial Visual Presentation
2016
A number of recent experiments demonstrate the role of ensemble summary statistics in perception (see Ariely 2001, Alvarez 2011 for review). It was found that summary statistics information does not require attentional resources, and can be processed rapidly and in parallel (Chong, Treisman, 2003; 2005b). Many other studies found that summary statistic information does require attentional resources (Whiting, Oriet, 2011; de Fockert, Marchant, 2008). In the present study, we investigate resources needed to process summary statistic information.

We used a Rapid Serial Visual Presentation (RSVP) paradigm with secondary memory task for a target white letter. 29 participants viewed a rapid presentation of letters in the center of the screen. One letter in a stream was (A, T or H) followed by a letter surrounded by white circles. Circle sizes were normally distributed in each trial. There were thee size means: 16, 26 and 36 pixels with standard deviation 6 pixels. After the stream, participants adjusted one central circle to the mean size of circles in the stream, then responded to white letter. We fix the circle time presentation in RSVP and vary T1 time occurrence (100, 200, 300ms, 400ms, 500ms, 700 ms). As a control in the second stage of the experiment participants were instructed to ignore the T1 task; also the response to this task was excluded. In another experiment, we replicate previous results. And in the last experiment replicate classical Raymond (1992) results.

We found a significant lag difference at 100-ms and 200-ms, with 700-ms lag. Similar results were found in the control stage. Two possible explanations are discussed. First, summary statistic perception requires attentional resources. Second, a perception of summary statistic processing is influenced by other information, even if participants are told to ignore everything except the ensemble task. This may be attentional capture effect.

Student Theses at HSE must be completed in accordance with the University Rules and regulations specified by each educational programme.

Summaries of all theses must be published and made freely available on the HSE website.

The full text of a thesis can be published in open access on the HSE website only if the authoring student (copyright holder) agrees, or, if the thesis was written by a team of students, if all the co-authors (copyright holders) agree. After a thesis is published on the HSE website, it obtains the status of an online publication.

Student theses are objects of copyright and their use is subject to limitations in accordance with the Russian Federation’s law on intellectual property.

In the event that a thesis is quoted or otherwise used, reference to the author’s name and the source of quotation is required.

Search all student theses